Merlin

is a member of the Seven Deadly Sins and is known as the Boar's Sin of Gluttony. She is regarded as the greatest mage in Britannia. Her Sacred Treasure is the Morning Star Aldan, a floating orb she can summon at will and often uses in conjunction with her spells and her inherent power Infinity. The name "Merlin" is actually an alias as her true name is unpronounceable to humans.

Appearance
Ten years ago, Merlin was wearing a full set of armor with a unique helm that resembled a beetle, like the rest of her fellow Seven Deadly Sins. This armor set had a long dress and she wore high heeled boots. Merlin's wanted poster depicts her as a young woman with long dark-colored hair. Her Seven Deadly Sins tattoo is located at the left side of her neck and is colored red, hence her nickname as the "Crimson Pig".

Ten years afterwards, Merlin was first seen wearing a long violet cloak that covered her whole body and her face, making her sex ambiguous. When the cloak was ripped apart, Merlin was shown to look very similar to her appearance on her wanted poster. She is seen as a slim, attractive, tall woman with three beauty marks below her right eye (though after her reappearance after Hendrickson's defeat, she appears to only have a single, lower-placed, larger beauty mark). Her outfit consists of a highly revealing and open fur collared long coat, with heart shaped buttons, short shorts with a heart on it, and thigh high boots. Merlin's hair is at shoulder length and black.

After having her magic seal spell reflected back by Chandler's Full Counter, it is revealed that her true form is that of a childish form of herself seen thus far disguised by magic. In this form, she is described as an adorable child by Chandler with long black hair reaching her mid back.

Personality
Prior to the Seven Deadly Sins' supposed betrayal, Merlin demonstrates a playful nature, telling her teammates that their meeting with the Great Holy Knight might turn out to be a scolding from their superior for destroying the Great Druid Altar. Merlin is also apologetic, in asking for her captain's forgiveness for knocking him out. She enjoys mocking and challenging others, teasing her apprentice Vivian for losing herself in rage again. Merlin tends to use anyone as a magical guinea pig to test out new techniques she learned so long as the results are good (as Meliodas had noted).

Merlin is a very calm and passive woman, almost never loosing her cool regardless of the situation. Even as she and everyone were being overwhelmed by Galan Merlin remained calm and was able to think of a strategy to counter him. The only time she loses her calmness is when the situation is beyond her ability to cope, such as Meliodas reverting to his previous self or when Arthur was impaled by his own sword.

Merlin is described as a very mysterious woman, as many who know her have a difficult time telling what she is after. She expressed excitement when the Ten Commandments were free, primarily knowing she could gain a large amount of information from their appearance and taking an interest in Escanor's powers due to the many mysteries surrounding him. According to Meliodas, Merlin tends to take an interest in anything that is considered "rare", such as Escanor's powers and various Demons she can use for her experiments. Even Demons have a hard time understanding what she's after.

Despite her mysterious nature, according to Escanor, Merlin is a very kind and cheerful woman. She is normally kind and polite to everyone around her, even those she does not know. She is also the only person who treats Escanor as a person rather than a monster as everyone else does prior to him joining the Sins. She also has a motherly side, treating Arthur as a mother would a son and was deeply saddened over his death.

Despite her usually kind and calm behavior, Merlin knows when to be serious. As when regarding the revival of the Commandments, she scolded Hawk for taking the situation lightly. She also took command after Arthur was killed refusing to let anyone else she cares for to die.

Merlin loves knowledge above all else. Because of her desire to learn everything, she suspended her own age to have all the time in the world to study and learn everything. For that reason she regularly takes excitement whenever she has the potential to learn anything she does not know about. She was interested in Escanor primarily due to his unique powers as well as how it fluctuates during the day, and studies a captured Grayroad to learn more about how his Commandment works. Because of her desire for knowledge, Merlin is a very shrewd and intelligent woman, being able to calmly assess the situation at hand no matter how dire it is as well as explaining the mechanics over any form of creature or magic by heart. However, Merlin is not above acknowledging when she does not know something or when a situation is beyond her capability to understand.

Despite Merlin being usually calm and serious, she is capable of being shocked or embarrassed. As when Elizabeth regained her memories she asked Merlin if she could call her "Big Sis-Sis" like she used to which left Merlin deeply embarrassed. She even was embarrassed when the others Sins (mainly Escanor) asked if Elizabeth could talk about it more.

She appears to have very little modesty, as Merlin has no problems wearing very little in public or even allowing Escanor to give her a massage while she was taking a bath.

3000 years ago
Merlin was born in Belialuin, the capital of the wizards, which remained neutral in the conflict between the Goddess Clan and the Demon Clan. As a miraculous child born with infinite magic, the news soon spread in the realms of the goddesses and the demons and both parties tried to put the girl on their side to tip the balance of the war in their favor. The people of Belialuin opposed this, claiming that both the girl and her power were their property. However, against the wishes of her people, Merlin decided to negotiate with the gods of both clans, the Supreme Deity and the Demon King, and said she would follow the one who gave her the best blessing. The Demon King gave her all the knowledge of the dark secret arts of Demon Realm and made her immune to the brainwashing and possession abilities of the goddesses. The Supreme Deity gave her protection against dark curses and Commandments. Merlin, somehow managed to deceive both gods to renege on them by accepting both blessings. Furious, the two gods unleashed their anger against Belialuin, cursing it with fog and death for a thousand days and destroying it with fire and lightning. Merlin was able to escape unharmed, becoming the only survivor of Belialuin.

At some point in her youth, she met Meliodas and Elizabeth's original incarnation, becoming very close to the latter and considered her like a sister.

16 years ago
Merlin was with Meliodas at this time, as the founding members of the Seven Deadly Sins and it was she who, guided by the vision of king Bartra, identified the other five members, while Meliodas himself recruited them. While Meliodas recruited most of the sins personally, it has been implied that Merlin helped somewhat with the recruitment of Gowther, as Meliodas was friends with the original Gowther 3000 years ago and both were aware of his past, yet Meliodas himself did not recognize or even seem to know of his true appearance, until years later when they were reunited. When Merlin and Meliodas met Escanor, they invited him to join the Seven Deadly Sins. The sorceress took interest in the man, and he fell in love with her at first sight. She was never afraid of his monstrous strength. It is known that Merlin participated in missions that the Seven Deadly Sins were assigned to. At some point in time, Merlin and her fellow Sins met with King Liones (who was accompanied by a young Elizabeth), according to Gowther.

12 years ago
Merlin and her fellow Deadly Sins were summoned by the Great Holy Knight Zaratras to discuss the recent loss of the Kingdom of Edinburgh to a clan of Vampires. Merlin did not fight much during the mission, simply teleporting the group to the location and keeping an eye on Escanor to ensure he did not loose control of his powers. After picking up Orlondi's eye ball, because Ban was tired from doing a hundred thousand push-ups, Merlin and Gowther were left to knock Escanor out and take him home after he killed the Vampire King Izraf. They then witnessed Meliodas' hidden power when he created a hole 30,000 feet deep. Later, she entered Escanor's room asking him to read a poem he wrote for her.

10 years ago
At some point, Merlin gave Gowther an enchanted armor for unknown reasons. Merlin once took in Vivian as her apprentice in the arts of magic. She had to constantly remind her to end the habit of losing herself in rage. Ten years ago, after defeating a troll queen and accidentally destroying the Great Druid Altar, she was summoned along with the rest of the Seven Deadly Sins to a castle to meet the Great Holy Knight Zaratras. After they found him dead, all of the Sins were ambushed by the Liones Holy Knights. After Meliodas ordered the group to disperse, a little girl helped the Deadly Sins to escape. In the chaos, the girl was heavily injured, and Meliodas lost control of his anger. Merlin apologized to him and knocked him unconscious, stealing his strength and taking it to Istar to seal it away until the time came. At some point, Merlin joined the Kingdom of Camelot and became a mentor to the new king, Arthur Pendragon, eventually travelling with him back to Liones to free Bartra Liones from the Holy Knights.

Introduction arc
Merlin's wanted poster is displayed on a board in Boar Hat.

Armor Giant arc
Using his ability Invasion, Gowther saw in Meliodas' memory that Merlin was the one that attacked and rendered him unconscious, her reasons unclear. Gowther also mentioned that since that time, he had heard many rumors about her, but that none of them led to her.

Kingdom Infiltration arc
When Merlin and Arthur traveled to Liones, she created an illusionary army to get the Grand Masters' attention, as they felt they would not be granted an audience with the king without a large presence. Merlin, disguised with a cloak, snapped her fingers and the army disappeared, leaving Hendrickson and his envoy astonished and impressed. Hendrickson apologized and stated that the king was sick in bed, but still they insisted on seeing him. As he was escorting them to King Liones, Hendrickson attacked them, stating that it was quite common for envoys to be assassinated, even if it was the king of another country. Hendrickson took Arthur while his two Holy Knights accomplices fought Merlin. Merlin easily won the battle and went to support Arthur, healing him after he got hit by Hendrickson's Hellblaze. Arthur told Merlin to stay back while he fought, which caused Hendrickson to reflect on Arthur's and Merlin's abilities. When Arthur was defeated by Hendrickson, Arthur started to blame himself as he was not strong enough, but Merlin, still disguised, told Arthur that he perform admirably and just surviving a fight against a Great Holy Knight of another kingdom was significant. She said that Arthur's first battle was well done and that he should watch Meliodas's battle, as it would serve him in the future, for he was destined to lead Britannia one day.

Later on, Vivian teleported the Holy Knights and the Deadly Sins to a forest in order to prevent them from rescuing Princess Elizabeth. Fortunately, Merlin sends the group back to Liones and begins toying with Vivian, sending her to different locations, enraging her. Vivian attacks her with a strong wind, and as her cloak is torn apart, her identity is revealed. Everyone was either shocked or happy to see Merlin, however, Meliodas was displeased as he believed Merlin was the one who knocked him out ten years ago, and as such wanted answers from her. Yet, he decided to ask her later as they needed to save Elizabeth and Bartra Liones, which Merlin happily agreed with, as she teleported the group to the Royal Chambers. The group was shocked to be in the location so fast and noticed that the Dawn Roar were there as well. As Meliodas was about to try and destroy the door, Merlin revealed that it would be impossible to break in, as it was protected by "Perfect Cube", a spell from the Demon World, and as such would not be destroyed with either strong or weak attacks. Merlin used "Absolute Cancel" and broke the spell, freeing Elizabeth and Bartra. During Dreyfus interrogation, Merlin revealed that Vivian was obsessed with Gilthunder and was willingly to take him and Margaret hostage.

After the situation, Bartra started to cough blood which alarmed everyone until Merlin came and offered to heal him back in Camelot along with Arthur. As Merlin was about to leave through teleport, Arthur told her to wait as he went to Meliodas and offered him the title and rank of Great Holy Knight in Camelot as he believed that they were fated to meet. Everyone was surprised and shocked at Arthur's offer, but Meliodas accepted Arthur's offer, to Elizabeth dismay, as Meliodas believed that since the kingdom was saved, Elizabeth was freed, and Dawn Roar would take over the Deadly Sins' job, there would be no need of him in Liones anymore. Arthur was ecstatic to hear Meliodas acceptance, but Meliodas told him not yet, as he need to stay in the kingdom to restore it and he still had the Boar Hat to run. Meliodas then asked Merlin if she would rejoin the Deadly Sins, to which she replied not right away and teleported along with the sick Bartra and the depressed Arthur, much to the team's displeasure. As a result, none of the three knew the next serious situation caused by Hendrickson. Later after Hendrickson's death and defeat, Merlin returned to Liones with King Bartra, who had recently recovered thanks to her new hidden technique from the Demon Realm, but Meliodas criticized her for using the king as her magical guinea pig, which the Boar's Sin of Gluttony brushed off so long as the result were good, much to the king's chagrin.

Merlin then listened to the Holy Knights kneeling down before their king, asking for heavy punishment for their sins for blindly following Hendrickson and his evil plot but Bartra instead told them to devote their power to the restoration of their kingdom and thanking the Seven Deadly Sins for saving the country. When Merlin quickly stopped Ban from trading blows with Gowther over Hawk's death, she asked the Goat's Sin of Lust where his armor had gone, and told him that she would get him a new one after hearing his answer. Merlin witnessed Hawk's revival as the Sins rejoiced of their animal companion's return.

Signs of Holy War
The day in which Ban and Meliodas pretend to have their fight, Merlin along with the rest of Lioness attend as spectators. There, she reminds both of them that the laws of the Seven Deadly Sins allow them to settle their differences with a fight, but that the others must interfere if it becomes a fight to the death. In order to avoid any damage to the spectators, Merlin encloses Ban and Meliodas in his Perfect Cube to fight comfortably.

During the following days, Merlin detects the presence of Vivian following Gilthunder in secret. When Meliodas asks her to become a waitress at Boar Hat, Merlin accepts only under the condition that Meliodas captures Vivian. After captured, Vivian is held in Merlin's laboratory, using special chains to nullify her magic. There, Merlin asks Gilthunder to decide Vivian's fate after what she did to him and Margaret, but Gilthunder decides not to punish her. Even so, Merlin uses her Curse Engage to curse Vivian and thus causing extreme pain and finally death if she does any wrong against Gilthunder. When Merlin reprimanded her for helping Hendrickson to release the Demon Clan, Vivian claims that they could have controlled them with weapons like the Goddess Amber. There, Merlin states that Goddess Amber can only enclose low-level demons like the Red Demon or Gray Demon, revealing the existence of much more powerful demons within the clan, which causes Vivian to burst into tears.

That night, Merlin fulfills her promise and works as a waitress at the Boar Hat, receiving praise from all the men when they sees her in the uniform of the tavern. However, when Meliodas reveals that he planned a routine of singing and dancing for the waitresses, Merlin resigns immediately.

Post-Kingdom Infiltration arc
As Liones was being rebuilt, Meliodas and Hawk were watching over the injured Elizabeth as she slept in her bed. Merlin teleported out of nowhere, and stated that Elizabeth had unlocked her powers without even thinking about it, which had only healed everyone else because she was thinking about all but herself. Even if Elizabeth had some power left, she still would not be heal herself first, which led to Hawk tearing up, believing that Elizabeth should at least think about her health first. Meliodas and Merlin discussed the location of the Eternal Coffin of Darkness, as it was no longer in Liones. Even with Merlin's "Location" magic, she had been unble to find it. However, it was revealed that a strange bird had appeared and flown to the east. Merlin revealed that she had told Arthur that she would be away for a while, as she would rejoin the Deadly Sins for the time being, which made Meliodas glad as it could save them,but still on adge due to her suspicious smile. Meliodas revealed that he still wanted to know what happened ten years ago while Merlin seemed interested in Hawk, calling him a hero which made the tiny pig happy and befriend Merlin. Meliodas realized that he had forgotten something and went back to Elizabeth room while Hawk yelled at him that he should not do anything weird to Elizabeth while she slept.

When Merlin and Margaret appeared in front of Elizabeth's room, Meliodas stept out of the room with a grin which made some of them worried that he had done something weird, until it was revealed that Elizabeth was up and healed for unknown reason. Hawk was overjoyed to see Elizabeth standing again, but wondered why she was moving again. Merlin seemed to know what Meliodas did as it was revealed that Meliodas held her hand and told her that he could not live without her, which made her wake up. At some point earlier, Merlin had given Diane Minimum Tablets to shrink down to human size while the latter's tattered clothes were being repaired for a while. In preparations for the National Foundation Festival, Merlin gave Diane a new outfit and a gauntlet replacing her previously lost one, back at the Forest of White Dreams. During the festival, Merlin, among the crowd of people and Holy Knights witnessed a marvelous display of fireworks. At some point after the festival, Merlin salvaged whatever remains of her Magical Items within her destroyed castle were left, and set up a temporary small castle until her old one was rebuilt. She gave Hawk Balor's Magical Eye as his new ear trinket and explained the fundamentals behind it, demonstrating the analyzing of the passing Holy Knights' Power Levels.

The Boar's Sin of Gluttony unwittingly lied to Hawk that his Power Level was 3000 as a playful joke that fed the talking pig's ego. Later at the award ceremony, Merlin was present with the rest of her fellow Sins (and Hawk who had somehow grown back to normal size), with the exception of Ban and King, who were at the new Fairy King's Forest, and Escanor who was still missing. When the king decided to go on with the award bestowing, Merlin witnessed Meliodas calling for the objection and the appearance of three of the Pleiades of the Azure Sky, Deathpierce, Dogedo, and Waillo when the Dragon's Sin of Wrath demanded they stoop forth to have a voice in the matter. The Boar's Sin of Gluttony witnessed a battle between Meliodas and Dogedo which ended in the former's victory and the latter's defeat and unconsciousness, with the satisfied Six Stars leaving the scene. When Hawk begins to panic about his companions' Power Levels, Merlin tells the talking pig that every member of the Seven Deadly Sins' Power Levels are higher than any Holy Knights' and her Power Level was revealed to be at 4710 much to Hawk's dismay.

Much later, the Deadly Sins encountered Gilthunder, Howzer, and Griamore who thanked Meliodas for defending them and Dreyfus, but felt troubled about themselves. Merlin advised them to go out and find the truth for themselves. Merlin accompanied her fellow Sins to meet with King Bartra, who informed them of the growing omen of the Holy War set in Camelot, south of Britannia. Later, Gowther went to Merlin's new headquarter where she gave him strange pills as medicine, which Hawk found tasty. As Diane came in, begging Merlin to find King, which Merlin teases her about, saying he might have turned invisible. Merlin then told Diane that if she stopped thinking about him, he might pop up and told her that they should get ready to leave for Camelot soon. When everyone left Merlin's home, Meliodas walked in, demanding to know what had happened ten years ago and wanting something that was stolen from him. Merlin revealed that she knew that the Demon Clan had been set free and believed Hendrickson was still alive. Meliodas was not worried about him as what he was most worried about is the ones who were set free, as he believed they were the Ten Commandments, hand-picked by the Demon King himself. Hearing, this, Merlin got a bit too excited as the items in her room flew around and asked to talk about this real issue.

Albion arc
Suddenly, Merlin and Meliodas were struck by Gowther's Blackout technique that knocked out everyone in the capital unconscious except for Diane and were believed to be affected as well. But later on, they're revealed to be alright as they searched around the city to find the cause behind the anomaly. There they find Elizabeth regaining consciousness and then the aftermath of the skirmish between Diane and Gowther appearing to be ended in a draw. After the short scuffle has been settled for now with Gowther returning Guila's old memories as well as Zeal's including their breakup of their relationship, Merlin and her fellow Sins confronts Slader who arrived on the scene. The Boar's Sin of Gluttony was pleased to see the Dawn Roar captain and had a favor for him, only for Meliodas to remind her that Slader only listens to the king. Merlin there uses Absolute Cancel to revert Gowther back to his original form a as doll. There she reveals that Gowther is in fact a doll created by a great wizard and ask Slader to take care of him until Gowther´s magic activates again. Merlin and the others returned back to the bar where Slader agree to join with them for a while and Elizabeth wanted to join, but Meliodas shut her down coldly to avoid her getting hurt by the Ten Commandant to the displease of others. However, Merlin got a call from Arthur who was under attack from a Albion and teleported to Camelot to battle the giant.

Merlin used her magic to make Hawk Mama fly over Camelot along everyone over her. Upon arriving, they discover the Albion trying to destroy Camelot, but a special magic barrier that Merlin has put around Camelot to protect it from harms stops it, but only for a short while. While Meliodas, Arthur and his men fought against Albion, Liz's Sword was soon broken which Merlin believed it was time for her to return his Sacred Treasure, Lostvayne, that she have finded in a basar. There, Meliodas used his Sacred Treasure to slay the golem and saved Camelot.

While the group chatted fondly, Galand of the Ten Commandments appeared and challenged everyone to a fight. Meliodas was shocked to see him and Galand revealed that he knew Meliodas and was surprised he had not aged at all for the last three thousand years, but still attacked him. Merlin takes care of Elizabeth, Hawk and Arthur, protecting them with her Perfect Cube. While the Deadly Sins fought bravely, they still lost to Galand, Merlin tries to support them equiping Diane and attemps to teleport Galand away, but the speed of the demon proved to be superior to her magic's. At which point Merlin tried to trick Galand by lying to him unitl find a way to prevent Camelot to receive more damage. As it turned out, Galand's Commandment of Truth, which turned anybody to stone should they lie to him, turns Merlin in a statue to horror of Arthur. The Deadly Sins were believed to have been killed by Galand, when in reality, his memories were altered by Gowther's Invasion.

Istar arc
While Camelot mages tried returning Merlin's body back to normal, they were not able to, but luckily, Merlin had stored her consciousness in her Sacred Treasure, and revealed that her body could only be returned to normal by the power of a Goddess. The group was still down about losing to Galand. However, Meliodas soon lifted everyone's spirits up by deciding to train more to get stronger, and to figure out a strategy. Even Arthur and Elizabeth would have to awake their hidden powers as well. Meliodas believed the situation was so bad, they would have to bring in Escanor and later went to check up on Diane's health until King popped up to check up on her. When the three checked on Diane, she was shown to have lost all of her memories, up to the point of meeting Meliodas for the first time. While Meliodas and the others talked about Diane's lost memories, King kept Diane company until she started to lose more memories and ran off. Gowther soon revealed that he had uses Lost World on her to test if her feelings for King were stronger than she said. After King punched Gowther, the others followed Diane, who was heading to Megadozer, until their were stopped by Monspeet's fire ball, which Hawk Mama ate, to the others shock. When they could not sense Diane's power level anymore, Meliodas believed she was fine and that they should focus on their training until they met Diane again. Meliodas decided the first thing to do was to head to Istar, the home of the Druids, and the location of Meliodas' stolen strength. On the way, Merlin reveals to his companions the truth about why he took Meliodas's power ten years ago, because it was too dangerous for him to control him by losing himself in his anger, but to fight with the Ten Commandments, they need that power.

Upon reaching Istar, Merlin explains to Slader that they can only enter the sacred land of the Druids if they will break through. After being greeted by Jenna and Zaneli, Merlin is pleased that these two will offer their help.

When everyone decides to enter the Training Caves to strengthen, Merlin says he can not accompany them since she still lacks a physical body. When observing the fight that unties between Meliodas and King, Merlin reveals the nature of the power Disaster of King, able to manipulate the life and the death.

After finally getting his strength back, Meliodas asks Merlin to teleport him to where the Ten Commandments are. Merlin tells him that he knows exactly where to send him by following Galand's presence, but that it will take at least ten seconds for him to bring him back, so he must face what the Commandments do to him at that time. After Meliodas returned safely and defeated Galand, Merlin is surprised by the cat that appears in Arthur's head. After leaving Istar, Hawk reads the new power level of Meliodas as 3,250 which is less than before. However, Merlin tells him that he forgot a zero at the end, leaving everyone shocked by revealing his power level at 32,500.

Defensive Battle for Liones arc
After Grayroad and Fraudrin of the Ten Commandments were able to successfully infiltrate Liones Castle, Merlin, freed from the petrification, appears to stop the former, caliming that she will turn them into her ginea pigs. After freezing Grayroad's eggs to delay the hatching of more Demons and save Howzer from her Five Lost, she engages in a fight with the queen of the Gray Demon. After defending herself from the demon's attacks and kill one of her faces with Exterminate Ray, Merlin is show no affected by Grayroad's Pacifism commandment. Therr Merlin reveals both her magic ability, Infinity, that lead everyone to call it unfair, and her true identity as the daughter of Belialuin. Utterly shocked, the Commandments are paralysed of fear and Merlin starts her offensive, ending the fight in one attack by sucking Grayroad in a small test tube with Endless Whirl. She then expresses joy about being able to experiment with such an unusual Demon.

After Hendrickson and Zaratras managed to purge Fraudrin out of Dreyfus' body, Merlin stays with the other survivors of the Commandment's assault on the capital and watches as at first the no longer controlled Dreyfus and Zaratras and eventually Meliodas, who returned from Purgatory, fight Fraudrin. To ensure the group's safety, she arrays the royal family and the Holy Knights in her Perfect Cube.

After Fraudrin was murdered by Meliodas, Merlin met with Escanor who asked how Meliodas was still alive, prompting Merlin to reveal the curse that the Demon King put on him, reviving him every time he died in exchange for his emotions are consumed more and more. In the end, Merlin states that no matter what atrocities he committed, Fraudrin did not deserve to die the way he did.

Memories of the Holy War arc
The night after the defeat of the Commandments, Merlin took care of rebuilding all the damage in the kingdom and castle. The next day, she explains everything to Escanor while he gives her a bath. However, she also claims that the battle is not over as all who were under the control of Zeldirs' Commandament fled to Camelot, which is the current headquarters of the Demon Clan. In order to face the next battle, Merlin states that the seven members of the Seven Deadly Sins must reunite to whom Meliodas is agree, so Merlin arranges things to free Gowther from his imprisonment.

Corand arc
While Merlin waits on the roof of the castle of Lions with the other Sins for a prophecy of Baltra about a "full moon" this turns out to be the arrival of Diane and King. After receiving them and hearing about their journey 3,000 years in the past, Merlin says that it could be the temporary regression technique belonging to the Goddess Clan. When Baltra appears and shows Gowther the magical heart that used to belong to him, this one of inemdiato leaves fleeing. Upon hearing about the "magic heart" that is imbued in the object, Merlin asks the king to allow him to examine it. There, following the rules of the Seven Deadly Sins of always helping each other in times of need, Merlin ba along with others in search of Gowther.

When Gowther is reached by Diane and King, they try to help him so that he does not erase his memories. There Merlin arrives and reveals Gowther's past with the princess Nadja Liones and how she died and Gowther tried to revive her with his magic heart, erasing his own memories and feelings when he could not do it. However, Merlin reveals that this "magic heart" is actually a common object and that this never had any "magic of heart" since the true heart of Gowther is within him at those moments. Thus, Gowther awakens his dormant feelings and memories, along with his true magical power. Merlin says that Gowther is the masterpiece of the life of a great wizard, so it is not surprising that he has always had a true heart.

Later, Merlin sends Orlondi to Camelot in search of Arthur. While Merlin watches through him from Liones, Orlondi is discovered by Zeldris, who releases his Hellblaze against him, however, Merlin is the one who receives the attack, being seriously wounded.

Merlin then joins his companions in his banquet, asking forgive for her delay. Upon hearing from Diane that the original Gowhter finished the Holy War, Merlin and Meliodas are surprised, wondering if it was he who created the Coffer of Eternal Darkness to what Meliodas tells her was created by a giant craftsman. After clarifying the situation of Camelot and the danger that Zeldris represents, Merlin goes saying that they needed a good plan and their absolute cooperation. In the way to her room, Merlin ending collapsing, but Meliodas goes to help her. Meliodas ask her if Zeldris was the responsible of her condition and and that she thake that risk all for Arthur, a weakened Merlin says that she can not afford to lose Arthur and claims that the young king is her hope.

The next morning, Merlin condition get worse, being completely unconscious and feber in bed. Upon find her, Escanor ask Hendrickson to help her, but his druid powers are unable to do something, as Merlin was under a curse put on her by Zeldris. There, Escanor ask Elizabeth to use her healing powers on her, as Hendrickson afirms that the princess's magic is strongest than of any Druid. After a confrontation with Zeldris, Elizabeth manages to release Merlin from the curse, as she gaves her thanks to Elizabeth and Escanor.

After returning to their old armors, Merlin pass to tell her companions about the dimensional distortion that prevents to enter in Camelot by any mean, physhical or magical, and that even Absolute Cancel is unable to undo it. Having locating the origin of the distortion in the city of Corand, Merlin states that their next mission is go there to eliminate the distortion.

Later, Merlin drinks with Escanor hoping to Arthur to be fine. Elizabeth starts acting strange suddenly, saying things related to her past lives. Seeking to confirm what happens, Merlin asks Elizbaeth if she recognizes her, being shocked when she tells her that it has been a while since she saw her and asks if she is still living on her own in Belialuin, as well as the Goddess Clan symbols appear in her eyes. When Elizabeth falls unconscious, everyone gathers in her room worried. Merlin claims that her condition may be due to the magic that Zeldris used in her when she released her from his curse. Meliodas reveals that Elizabeth is recovering the memories of her past lives, to which Diane happily says that she will remember everything that she lived, causing Merlin to scold her with taking care of her words. When Meliodas reveals the curse that is on him and Elizabeth, and that Elizabeth will die in three days after recovering her memories, Merlin is the only one of the Sins not to be impacted, being already aware of that fact.

During the trip to Corand, the group stops in Ordan to free it from demons that had oppressed them. Merlin asks Meliodas if it is right to distract from their objetive, to which Meliodas tells her that it is their duty as knights to help those who need it.

When they finally reach Corand, they are surprised at the entrance by Zeldris. Merlin tries to warn Meliodas that his presence can not be anything other than a trap, but Meliodas still tries to attack him, turning out to be nothing more than an illusion concocted by Melascula to capture Meliodas in her Cocoon of Darkness.

Upon entering Corand to find Meliodas, the many skeletons that populated the city after the massacre that destroyed it begin to come to life. Merlin identifies it as Melascula's technique that revives the dead through his anger and resentment. Being initially very weak, the Sins have no problems in facing them; Merlin gets rid of several of them with her fire magic. However, Melascula manages to take advantage of the negative energy of Meliodas to give power to his skeleton warriors. Merlin is surprised to see how the strength, speed and resistance to the magic of these is greatly increased. When Gowther is unable to control the skeletons with his Jack, Merlin saves him by destroying them with her Exterminate Ray. Merlin deduces that the skeletons are not moved by nerves that Gowther can control, but by their own resentment and by the enormous dark energy that comes from the center of the city, inferring that this is where Meliodas should be.

Upon Melascula tries to concentrate all the energy in the last skeleton remaining, Merlin anticipates that is impossible for it to sustain the inmense power of Meliodas, resulting in its destruction. However, Merlin adverts everyone that the remaining spirits of the dead are trying to take control of them. When Diane ends being possessed by all the spirits and turned againts them, Merlin declares that they have no other option that attack her with intention to kill, but King intervenes to prevent it.

Finally, Diane is purified by a awakened Elizabeth, who eliminates all the sprits with her Lest's There be Light. Having recovered all her memories, Elizabeth talks with Merlin about their past together when she was 12 years old, caliming that she become a beutiful woman, which makes Merlin somewhat taciturn. When Elizabeth asks if she no longer calls her "Big Sis Sis" as she used to do, Merlin is very embarrassed. When Escanor asks to know more about it, Merlin recriminates him not to get involved in that.

There, Melascula appears suddenly and assumes the form of a gigantic serpent. When this one is sent to attack Ban after this insulted it, Merlin is protected within her Perfect Cube, taking Elizabeth and Gowther with her.

Suddenly, an giant explosion of dark power destroy the center of Corand. Merlin affirms that it must be Meliodas, who was given freedom to all his demonic power. When Escanor goes with the intention of fight him, Merlin adverts him that in his current state, Meliodas is too much for even him to handle, but Escanor tells her to not worry. Knowing that Meliodas was deprived of all his emotions and feelings to recover his original power and sets free, Merlin traps him and Escanor inside a Perfect Cube, calling Meliodas a fool.

When Melascula is overpowered by Diane and King, Merlin states that the battle was decided in the momment that she underestimates them and chose to fight in that form instead of using her true magic power, affirming that she was too confident. When Melascula is finnaly immobilized by Elaine and Gowther, the fairy claims to Merlin to kill Melascula, even if that means her own death too. However, Elizabeth uses her Tranquilize to deprive Melascula of all the demonic miasma that gives her demonic powers, returning her to her original form as an harmless little snake. There, Merlin captures Melascula in a test tube as other of her ginea pigs. When Elizabeth calls Merlin little sister, Merlin is embrassed again.

While the fight between Escanor and Meliodas continues with the demon's advantage, Elizabeth asks Merlin to undo her Perfect Cube so that she stops them, but Merlin refuses because since he can not control his dark power, Meliodas will kill them all if come to be liberated. When Hawk asks what else they can do, Merlin simply states that it's almost midday. Escanor then receives a huge increase of power from his Shunshine, but this still is not enough to stop Meliodas who incapacitates him with a single blow. Merlin affirms that this is the Meliodas recognized by the legends of the Demon Clan and leader of the Ten Commandments. Although Escanor seems to have been defeated, Merlin says that everything comes down to the minute that Escanor assumes his most powerful form in the midday pineapple, describing him as the supreme incarnation of power, "The One". With that power, Escnor finally manages to defeat Meliodas.

Having finished the battle, Merlin charges Meliodas with his telekinesis while revealing that with the defeat of Melascula, the dimensional distortion on Camelot has been dissipated, but that Meliodas can not go in such a bad condition. Elizabeth asks him to let him cure him, but Merlin reminds him that if he did Meliodas would attack them and nobody could stop him. When Escanor affirms that he will stop him as many times as necessary, Merlin gives him a simple blow and he falls unconscious.

In the Boar Hat, Merlin explains that Escanor exhausted all his power in his battle with Meliodas, so he is probably in a worse condition than his. By the other hand, Meliodas have lost all his emotions and returned to be the old Meliodas from the Demon Clan. In that moment, Meliodas awakes, but Merlin knocks him again with her Shock Stinger. Merlin tries to lock him in her Perfect Cube, but Elizabeth tries to convince her not to do it. Merlin insists, so Elizabeth asks to be locked with him, to which Merlin agrees only under the condition that she stays to monitor both. Given her appointment, Merlin affirms that Diane, King and Gowther are the ones who will have to fight in case something happens, while in the two remaining days that Elizabeth has left, they think of a way to heal Escanor and recover Meliodas in order to free Camelot.

Prelude to the New Holy War arc
While watching over Meliodas and Elizabeth, Merlin feels the presence of a great dark power that was blinding the entire region. At that moment, an old man appears crying to see Meliodas and when to kill Elizabeth. When this individual manages to undo the Perfect Cube just by touching it with his cane, Merlin realizes that this use Absolute Cancel, affirming that he is not an ordinary enemy. After ordering Elizabeth to retreat, Merlin uses Magic Seal in an attempt to seal the old man's magic, but he responds with Full Counter, revealing being the one who taught Meliodas how to use that power. As a result of receiving his own Magic Seal, Merlin's magic ends up being deactivated, causing it to assume the form of a small child. Seeing her in that form, the elder identifies her as Belialuin's survivor.

When Chandler engages in a battle against the other Sins and Elizabeth, Merlin tries to awaken Escanor to help them. However, because of the artificial night that Chandler had created, Escanor returns to his weak form.

When the Boar Hat is taken out of the battle by Drole and Gloxinia, Merlin who was in search of her Incantation Orb to use Absolute Cancel, hits her head in the middle of the shock and ends up unconscious.After awakening with all his companions around, they explain what happened. Merlin claims that Chandler was a much worse monster than he had imagined. After regretting Gowther's pseudo-death state for opposing the Absolute Order and the microscopic size of Diane, the latter is surprised that her true appearance is that of a girl so tender. Merlin affirms that he must return to his old form as soon as possible, although Escanor prefers that he stay like this a little more. When everyone begins to feel sick, Merlin realizes that it is due to the demonic miasma that Meliodas is expelling, so Elizabeth takes him outside. Merlin asks Escanor if he is well and he says he is still in a position to fight. After asking for Ban, King tells her that he is with Elaine.

After finding her Incantation Orb and return to her adult form, Merlin helps to clean the room. At that moment, Merlin exclaims in alarm that Chandler is approaching. Upon leaving and discover that Meliodas regained consciousness, Merlin says that it could not happen at a worse time. When he takes Elizabeth and intends to leave with Chandler, Merlin demands to know what he intends to do with her, to which Melidoas reveals that he will become the Demon King to break her curse and at the same time declares the dissolution of the Seven Deadly Sins. When Hawk tries to reason with him and Meliodas speaks to him as if he were the Demon King, Merlin is surprised.

While everyone laments having lost Meliodas, Merlin reminds them that he no longer thinks clearly because the Demon King stole his emotions. When Hawk mentions what Meliodas told him earlier, Merlin asks him to expel him, uncovering to her surprise that Hawk is a living portal between this world and the Purgatory, further revealing that the Demon King has been spying on them through Hawk's eyes. Although everyone is shocked by that, Diane suggests that they could go to Purgatory through Hawk to recover Meliodas's stolen emotions. However, Merlin affirms that it is impossible since they must face the Demon King to do it, and that is also impossible for them to survive in the Purgatory, telling everyone how in the past her father spent a single minute in that place and returned as an invalid elder. There, Ban declares that he is the one who will do it since his immortality would allow him to survive. Merlin reminds him that although his body is immortal, he still has a human soul and that the result is more likely to die in the attempt to recover his emotions. When Ban insists on going anyway, Merlin calls him crazy but still recites the spell that sends Ban to the Purgatory through Hawk, reminding him that once there, they can not help him.

While everyone regroups, Merlin examines Grayroad's test tube, discovering that Melidoas took the Commandment of this one without her noticing. Suddenly, Merlin feels powerful presences approaching. While everyone is alarmed because they are not in a position to fight, Merlin claims that she will negotiate with the enemy already having an idea of her identity and that their goal is Melascula's Commandment that she possesses.

Once outside, Merlin discovers that the intruder is Zeldris, stating that it will be much easier than if it were Estarossa. Zeldris says that he has never seen her before, there Merlin resumes his original childhood form asking if he remembers her that way. Zeldris immediately recognizes her as the girl who received the blessings of the Demon King and the Supreme Deity. Upon hearing this, the other Sins are surprised. When the others try to confront Zeldris, Merlin tells them not to interfere and goes to talk to Zeldris in heaven. Before leaving, Merlin releases one of her hairs to create a talkative plant on Hawk for her companions to hear their conversation.

After Zeldris narrates Merlin's past, he asks for her intentions, leading Merlin to ask him why he is helping his brother gather the Commandments and use them to become the Demon King. Zeldris answers only saying that if she gives Melascula, he will forgive her companions. Merlin initially seems to give in, but soon she encloses Melascula in her Perfect Cube, telling Zeldris not to give it to her if he does not give her something in return. Zeldris agrees and Merlin asks him to return them to Elizabeth, but Zeldris says that Melidoas will not allow it. Merlin asks instead to give Arthur, but Zeldris can not give it to her either because he does not know his current situation or if he is still alive. In the end Merlin asks him to release all the knights and civilians of Lioness and Camelot who are under his Piety and to allow them to leave. When Zeldris meets her demands, he demands to disperse the Perfect Cube. Merlin begins to ramble saying that her shoulders hurt and Zeldris warns him that if she tries something he will kill her. Merlin claims that she will not do anything, and at that moment Zeldris is attacked by Ludoshel, who was in a Druid Altar near there.

Merlin quickly returns to Boar Hat, revealing to everyone that distracting Zeldris for the Four Archangels to attack him was his plan from the start. Merlin rushes to teleport everyone away saying that that is their oportunity to act.

Finally in Camelot, Merlin tells her companions that they must reunite all the prisioners that Zeldris let go and return them to Liones. While everyone put the afraid people together for Merlin to teleport them, Elizabeth arrives having scape. Upon everyone reunites, Merlin teleport the Boar Hat again and everyone decides to stop Melidoas to become the Demon King.

Right when Elizabeth and the Sins are back to Liones, they are greeted by Bartra, who thanks them for saving the hostages. When this one ask about the others, Merlin tell him that Gowhter is recovering of his wounds and that Melidoas and Ban are absent for their own reasons. When the Four Archangels also arrive and offer to form an alliance with Lionés and the Seven Deadly Sins, Merlin declares that they will follow Elizabeth's decision, affirming that she is now their leader. Being unable to save Meliodas on her own, Elizabeth officially creates the alliance with the Four Archangels.

Abilities and Equipment
Merlin is said to be the greatest magician in all of Britannia, and upon her introduction was shown to be capable of easily defeating some of the greatest Holy Knights in Liones and overpowering her former student Vivian, the most prominent mage of Liones. Later, upon freeing herself from petrification she defeated Grayroad, one of the Ten Commandments.

The simple mention of her birthplace and her true name is enough to frighten two members of the Ten Commandments and send one of them fleeing for their life. Later another member of the Ten Commandments praised her for being able to escape from his attack and noted it was no surprise that Grayroad would lose to her. Meliodas later claimed that she only fell victim to the attack due to being "caught off guard" in a trance state.

Through her vast knowledge of magic and spells, Merlin has demonstrated the ability to levitate and is able to cast illusions, having produced a large powerful mirage army that tricked even the Great Holy Knights. Though Merlin is unable to use true healing magic like the Druids from the eastern forest, she is able to cure illnesses using her magic item Cure Angel. In the aftermath of the battle with the Ten Commandments at Liones, Merlin restored the battle-ravaged kingdom to its former state within a single night.

In battle, Merlin often opts to teleport her opponents into a multitude of harsh environments as she attempted against Vivian and Galand. However, she can switch into multiple offensive spells which she channels through the sacred treasure Aldan. When battling against Grayroad, and Melascula's resurrected skeletons, she employed spells such as Exterminate Ray and potent magical blasts to incinerate her opponents. She also has access to an array of elemental spells such as Endless Whirl and Icicle Castle to overwhelm opponents, the former having enough power to destroy the castle of Liones.

Against more powerful individuals, Merlin prefers to render opponents powerless immediately, illustrated through her regular strategy of knocking Escanor unconscious through a combination of Power Amplify and Gowther's Blackout Arrow. This is also evident in her use of Perfect Cube to quarantine Meliodas and her later attempt to use Magic Seal against Chandler after witnessing his use of Absolute Cancel to free Meliodas.

In conjunction with her magic Infinity, Merlin utilises an array of spells to serve supplementary purposes such as inhibiting the growth of Grayroad's demon eggs by freezing them for eternity and freezing her own time to create a form of immortality. Through the blessing of the Demon King and studies under the Ten Commandments' Gowther, Merlin has also gained knowledge on the secret techniques originating from the Demon Realm such as Perfect Cube and Absolute Order.

After receiving the blessings of both the Demon King and the Supreme Deity, Merlin gained immunity to the brainwashing and possession abilities of the Goddess Clan, as well as resistance against magic attacks and dark curses, including the Commandments, as she was capable of freeing herself from the "Truth" commandment and remained unaffected by Grayroad's "Thou Shalt not Kill."

Abilities

 * An ability that allows Merlin to stop the time of her spells, causing them to last for eternity. The ability is so powerful that many label it as 'cheating'.


 * By placing her hands over a spell, Merlin is able to completely erase it from existence. However, if the particular sort of magic is being sufficiently powerful, it may be difficult to erase completely, instead being temporarily suspended.
 * A technique that allows Merlin to cancel any magic that has been cast on an individual. It was shown to cancel the effects of one of her own magical items.


 * A power that allows Merlin to locate any item or person. She can extend its reach to cover an area of approximately the size of a city.


 * A spell that allows Merlin to amplify the magic of her allies, making their techniques considerably more powerful.


 * A spell that denies entry to anyone but the caster. Originating from the demon world, the spell surrounds a specified area and reflects all attacks, whether strong or weak, back at the opponent.


 * High-level teleportation magic that allows Merlin to appear and disappear at precise locations and teleport groups of people instantaneously. The spell effect radius of Merlin's teleportation is several miles wide. Her teleportation magic was shown to be much faster than that of the Liones Kingdom's greatest magician.
 * A subsidiary teleportation technique that allows Merlin to summon various objects, such as clothes and weapons, to herself and her allies.


 * A spell that creates clothes made of water. By refracting the light in the water, Merlin is able to hide the most "important" parts.


 * A spell that allows Merlin to call many dragons made of water.


 * A spell that allows Merlin to attack the opponent with a powerful blast of fire.


 * A spell where Merlin fires a disintegration beam, incinerating everything in the line of fire.


 * A spell with which Merlin creates a vortex of wind with an incredible destructive power, sucking their objectives towards its center.


 * A spell with which Merlin creates a contract between two beings to control one of them. By placing a ring on the hand of the victim, this is subject to the spell that causes excruciating pain in their body every time they try to use magic against the other person or the other person saying the incantation "Remada". Each time the spell is used, the person affected will be covered by brands that are becoming larger and once these brands cover their entire body, the affected person will die. The victim of the spell is unable to ever remove the ring.


 * A spell with which Merlin throws a lightning bolt at the enemy causing a great impact on his body.


 * A technique that seals away the magic of the objective.


 * A spell with which Merlin traps her targets inside huge pillars of ice.This spell was powerful enough to restrain Cusack for a brief period.

Weapon

 * Aldan: The sacred treasure Aldan takes on the appearance of a small sphere that floats in Merlin's palm.

Magic Items

 * No. 9: The Needle of Humanification: A syringe capable of giving a human body to any non-human creature with which it is injected.


 * No. 48: Cure Angel: A demonic caterpillar-like creature that is used for healing.


 * No. 91: Heat Fork: A large wooden fork able to heat things up.


 * No. 172: Minimum Tablets: Based on the spores released by the Chicken-Matango, the Minimum Tablet is capable of shrinking the size of the consumer. The effects of one single pill can endure up to seven hours.


 * No. 174: Peace Amulet: An amulet that will hold down the wielder's negative emotions.


 * No. 300: Monster Block: Bite-sized pieces of various monster and beast's meat.


 * Balor's Power Eye: Named after the One-Eyed God, Balor, the Eye grants the ability of viewing other character's fighting prowess in the form of numerical values which are split into 3 categories: Power, Strength and Spirit.


 * Goddess Amber: A stone that will affect demonic beings within a specific radius. It is used by Veronica to seal Meliodas on Hendrickson's orders.


 * Incantation Orbs: A series of magical orbs that activate a spell upon destruction.

Seven Deadly Sins
Not much is revealed of Merlin's relationship with her fellow Sins but ten years ago, she playfully speculated that they were summoned by the Great Holy Knight for a scolding about their last mission.

Meliodas
Merlin highly respects her captain, but Meliodas has shown criticism for using someone like the king as a magical guinea pig for testing out new techniques, though she brushes it off. The two possibly have, or had, a close relationship as Merlin believes that she may be forgiven for what she has done to Meliodas ten years ago. Also, among the various characters, Merlin is the only person to whom Meliodas has been willing to talk about more sensitive topics, such as his knowledge of demons, implying a deeper and/or longer relationship with each other compared to the other Sins. It is hinted that Merlin could harbour feelings for Meliodas at some point. It is later revealed that the reason for their closeness is that the two have known each other for over 3000 years, since the beginning of the holy war, and since then the two have been preparing for the potential consequences of that war to once again return, mainly the revival of the Demon Clan and the ten commandments. Over the years, she has supported and even helped Meliodas form the Seven Deadly Sins specifically in preparation for these events.

As a result of this long relationship, Meliodas and Merlin know almost everything about one another, and seem to be both equally close and cautious towards one another due to how much they know about the other. The best example of this is the fact that Merlin was the one who knocked Meliodas unconscious, stole most of power and sealed it away in Istar 10 years ago when the Seven Deadly Sins were framed, an action that Meliodas was both curious and annoyed with when he finally learned she was responsible. In addition to this Merlin has shown little to no remorse for doing this, stating that it was necessary at the time, which also annoyed Meliodas. Merlin also took it upon herself to buy back Meliodas' sacred treasure after he sold it, knowing that he would eventually need it again. Unlike the other sins, Meliodas was the only one to notice and question Merlin's hastiness towards returning to camelot as well as noticing her injury from her encounter with Zeldris, showing concern for her as well as curiosity as to why she wanted to go back to camelot so badly. Merlin reluctantly admitted the reason was because she wanted to find King Arthur, and even admitted to Meliodas how important he is to her, showing that the two of them are closer friends than they appear to be.

This was proven even further when she showed concern for Meliodas when he activated his own curse and completely unleashed his full power in his assault mode, to which she responded by asking Escanor to handle stopping him before he completely loses his emotions and control of himself. After their battle she tries to her best to suppress Meliodas, and she seemed concerned by her inability to help suppress his growing darkness. After he expressed his goal to become the next demon king to break his and Elizabeth's curses, Merlin seemed to be vexed and unhappy with his plan, being fully aware that his plan would not end the way he wants it to, and that it's not what he or Elizabeth truly want. After this, Merlin; like the rest of the sins, wanted nothing but to stop his plan, as she was the one to suggest a trip to purgatory to retrieve Meliodas' lost emotions.

Ban
Merlin's relationship with Ban seems somewhat checkered, but the two have shown to be capable of getting along. Merlin was shown to calm Ban down when he threatened to attack Gowther in anger over the Goat's Sin of Lust's lack of empathy regarding Hawk's apparent death. Merlin also stopped Ban from destroying the remains of the grey demon in order to study it, despite Ban's strong desire to destroy the remains, which greatly upset him. Despite their differences, the two have both shown a moderate interest in each other's abilities. Ban once challenged her to a fight since he`never saw her full power before, but fell to her wits when Merlin dared him to do a hundred thousand push-ups just to tire him out, and in turn Merlin showed amusement in taking advantage of Ban's greediness and immortality to both test and mess with him.

Gowther
Gowther seems to have a history with Merlin, as she was the one who gave him his armor, which explains her instantly recognizing him, while the other Sins only recently discovered his true appearance. Merlin also seems to defend Gowther's clueless and emotionless nature, which implies that she is possibly aware of Gowther's past, as well as the reasons for his unusual behavior. After Gowther is revealed to be a doll, by Merlin, it appears she was the only one who knew, and even explained to the others about how he was created by a great wizard. Both of these examples heavily implies the two had some sort of relationship long before their mutual membership within the Seven Deadly Sins, and/or that she was involved with him joining the Sins in the first place.

Diane
Merlin and Diane are on good terms with each other as the only female members of the Seven Deadly Sins, as shown with Merlin and Diane playfully debating what Great Holy Knight Zaratras would give their team, either a reward or scolding for their last mission, before discovering the murder ten years ago ; and later giving Diane her Minium Tablets to allow the giantess to shrink down to human size and wear human clothes while her clothes are in repair. Merlin has since continued to use her magic to allow Diane to shrink down when needed.

King
Merlin and King are both members of the Seven Deadly Sins. The two have shown very little interaction between one another, and it is currently unknown as to how close they are in comparison to the rest of the sins.

Escanor
Merlin and Escanor are both members of the Seven Deadly Sins. While Escanor has a crush on her and wanted to look good in front of her, it is yet unknown if Merlin shared the same feelings towards Escanor, but she did insist on hearing the poem he had written for her and is interested in finding out the true nature on Escanor power. Merlin has also shown interest in which Escanor is the real one when his sunshine power changes his personality and confidence. This interest and knowledge of Escanor's power has given Merlin a great deal of confidence in him, so much so that she left him in charge of stopping Meliodas when he activated his assault mode, stating that he was the only one capable of stopping him while he was in that state. Even after their battle, she showed both concern for Escanor's injuries, as well as annoyance at Escanor for trying to shrug off his injuries in front of her as if they were nothing.

Elizabeth Liones
Merlin and Elizabeth have a fairly good relationship, due to Merlin saving Elizabeth's father's life and the princess shows respect towards the mage like towards any other member of the Deadly Sins. After Meliodas revealed his past and the secret of his and Elizabeth's curse, as well as Elizabeth regaining the memories of her previous incarnations, Merlin's relationship with Elizabeth has visibly become only stronger. Merlin now shows the same level of care and concern for her as she had for Elizabeth's original goddess incarnation. During the aftermath of the fight with Melascula, the two exchanged warm pleasantries with one another, and Merlin even referred to her as "Big Sis Sis", as she use to do with the original Elizabeth.

Hawk
Merlin and Hawk have a very good relationship as Merlin see Hawk as a hero due to his action for saving Meliodas and believed that they should stick together due to them being both 'boars.' She also tends to refer to him as Sir Hawk and gave Hawk the Eye of Balor, as well as teasingly lying about his Power Level so he would not be upset.

Arthur Pendragon
The two share a student-and-master relationship, and seem to be very close. It is not known how the two met, but Merlin seems to be somewhat protective of him, covering his eyes with her hand as Meliodas gropes Elizabeth and insisting on going to Camelot right away when she notices something happening there. They seem to have a mother-and-son relationship, as she took him in after his adoptive father died and was shown showing him how to read.

Elizabeth
Merlin and Elizabeth were acquaintances back 3000 years ago, when Merlin was 12-13 years old. According to Elizabeth, Merlin used to call her "Big Sis Sis". She also looked up to her as though she were her actual big sister.

Albion arc

 * Meliodas, Merlin, Arthur and the Holy knights of Camelot vs. Albion: Win
 * Meliodas, Diane, Merlin, Slader & the Holy Knights of Camelot vs. Galand: Lose

Defensive Battle for Liones arc

 * Merlin vs. Grayroad: Win

Corand arc

 * Seven Deadly Sins vs. Melascula: Win

Trivia

 * According to the official fanbook:
 * She is right-handed
 * Before being framed, she held the Diamond rank
 * Daily routine: Research and experiments
 * Weak Point: Once she concentrates on something she forgets everything else around her
 * Birthplace: Belialuin
 * What she likes about herself: Being a passionate researcher
 * Dream/Hope: Knowing everything
 * Regrets: Being born
 * The most embarrassing thing in her life: The one time when she confessed her love
 * What she wants the most right now: Lifting the curse of the commandment
 * Favorite animal: Hundun’s mother
 * Favorite scent: Her research facility
 * Favorite food: Raisins
 * Charming point: Her suspicious smile
 * She has no complex
 * There is no person she respects
 * She does not want to make an enemy of Meliodas
 * In Arthurian legends, Merlin is the name of a legendary wizard and adviser to Arthur, the King of Camelot, as well the mentor of Vivian, who despised Merlin.
 * Sometime after the Sins were framed, Merlin's old castle in the Kingdom of Liones started being used as Hendrickson's Magical Research Facility, and overflowed with rare magical artifacts prior to its destruction. After Hendrickson's defeat Merlin started using another building to house various magic materials, though it is considerably smaller, appearing to be only a one, possibly two, story building, with what what appears to only be one room per floor, at least for the first floor.
 * For yet unknown reasons, she did not use Location to find Escanor in an instant, despite being able to.
 * Merlin's tattoo oddly resembles Hawk.
 * Merlin uses magic to manipulate her clothes so that they stay on.
 * In Volume 5 it is revealed during a Conversation between Hawk and Meliodas that the Tattoos of each Sin were created by Merlin using a Magic Spell.
 * The Sin of Gluttony is usually symbolized with a Pig and the color orange.
 * This makes Merlin the only one of the Seven Deadly Sins whose animal tattoo corresponds with the animal of the real sin that she represents.
 * In the Nanatsu no Taizai Popularity Poll, Merlin was placed 9th for postcards.
 * The advice corner for chapter 117 notes that Merlin has the biggest sweet tooth among the seven sins, being dependent on sweets when she is deep in thought.
 * In the databook it was stated that Merlin once had several other apprentices before Vivian.
 * In the extra page of Extra Chapter 10 that was only published in Volume 24, it is hinted that the person Merlin confessed her love to was Meliodas.
 * It is revealed that Merlin body stopped aging at age 30.
 * It has been revealed when she was 12 or 13 years old she looked up to Elizabeth (the original goddess) as her "big sis sis"
 * Merlin revealed that the last time she cried was 430 years ago, after eating Meliodas' special Demon Frog Liver cakes.

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