Tristan Liones

is the son of Meliodas and Elizabeth Liones, the prince of the Kingdom of Liones, a Holy Knight, and one of the Four Knights of the Apocalypse.

Appearance
Tristan closely resembles both of his parents. He has the same face and hairstyle as Meliodas, although his hair is long and silver like Elizabeth's. He has heterochromia, his right eye being blue like Elizabeth's and his left green like Meliodas's.

At age 16, he is taller and much more mature, both in appearance and personality, as well as wearing a blue earring closely resembling Elizabeth’s on his right ear.

When using his Goddess Powers, he gains a triskelion in both eyes. He then can gain Goddess wings for flight.

When using his Demon Powers, his eyes turn jet-black, with branch-like lines coming from them, and a large black mark on his forehead in the shape of a 4-pointed star.

Personality
Tristan is a very energetic and tenacious boy. He expresses no appreciation about the role of prince, instead preferring to defend his kingdom as a Holy Knight.

Despite pretending to be a knight, he holds a great sense of justice and feels the need to protect his kingdom from anything threatening it, including his father and other Sins upon hearing how they were framed years ago yet didn't know how they were framed until learning from Gowther's "story".

After learning about his parent's journey around Britannia and fighting the Ten Commandments, he desires to become the Seven Deadly Sins due to their heroics in saving the land from the Demon King and Cath Palug, showing that he has great respect and admiration for heroes.

During the current events of the Four Knights of Apocalypse, we see that Tristan is a pacifist like his mother. He cares for his comrades and others when they're in danger. He doesn't tolerate violence and will only take action when he feels like it's his last resort.

When using his Demonic Power, he seems to become more violent and serious, abandoning his pacifistic ideals, becoming willing to attack an enemy.

We also see that he has a resistance to use the Demonic power that he has inherited from his father, for fear of being called a monster and being compared to his father.

Perhaps as a result of his demonic powers, He seems to prefer his mother over her father, as he happily takes any comment pointing out his and his mother's similarities with joy. As well as happily agreeing he and his father are not alike, despite people pointing out that he is more like his father after using his demonic powers, which he seems to dislike hearing.

Epilogue arc
On his tenth birthday, Tristan heard one of the maids talk about the Seven Deadly Sins meeting in the castle that same night. Ignoring the truth about them and only knowing that they were criminals who were once exiled from the kingdom, Tristan assumes that they intend to take control of Liones. He then runs off to call other children of the kingdom telling them that as a Holy Knight who protects the peace of Liones it is his duty to capture them.

When his friends do not take any of his words seriously, Tristan decides to go to the castle and ambush them on his own. There, he is surprised by Elizabeth who was looking for him, which worries Tristan for having been discovered by the Sins. Meliodas and the Sins introduce themselves, although everyone is friendly with him, Tristan is suspicious stating that he knows they intend to do a coup d'etat. Everyone takes it as him trying to play hero, even Meliodas jokes about acting like a villain to falsely prove his son's suspicion.

Tristan is then taken outside where the entire kingdom has gathered to celebrate his birthday. Although Tristan insists that his father is the leader of some villains, Ban tells him that if so, the people of the kingdom would not admire him the way they do. Tristan sticks to his ideas by highlighting all of his father's bad habits. Gowther then uses his powers to give him a special gift: to show him the true story of the Seven Deadly Sins.

The next day, Tristan goes to a picnic with his parents. After a sword training session with Meliodas, he tells him that his future expands like heaven and that he does not have to become a king, which may be what he decides, even a Holy Knight. Tristan then says that he has already decided: he will be one of the Seven Deadly Sins.

Chaos in Liones arc
Tristan appears on the streets of Liones where his three followers, the Tristan Platoon, were attacking Percival's group whom they believed to be Knights of Camelot. Recognizing the Dragon Handle that had already been reported in an ally's possession, Tristan orders Chion to remove his Sylph, but then Percival mummifies his arm and attacks Jade, for which Trsitan sends him flying with a kick and after taking flying with her Goddess wings, she asks Percival who he really is. Hearing him speak in a strange language, Tristan attacks him with his Twinkle Star, but it has no effect, leading him to see that Percival is not a demon. Trsitan then knocks Percival down with his swords, but his three friends rise to shield Percival and leave everyone shocked when they manage to bring Percival back to his senses.

Trsitan uses his magic to heal Percival's friends, but is unable to reverse the mummification of Chion's arm. He suggests going to Hendrickson or his mother to figure it out, until Percival manages to heal him himself. Tristan then asks Isolde what led to the situation, but the girl is embarrassed that she "had her chastity taken from her" and she leaves in tears. Trsitan formally introduces himself to Percival, revealing himself as the prince of Liones and one of the Four Knights of the Apocalypse as Percival. Trsitan is glad that the four of them are in Liones, revealing Lancelot to be one as well.

When Lancelot arrives, Tristan shows glad to see him and ask if he already meet the fourth member he brought, to wich Lancelot informs that the fourth member had fled the scene. Tristan asks why he ran away, to which Lancelot says he doesn't know and that the king charged everyone to "clean up the prince's mess". Lancelot orders Tristan's party and Percival's party to check the east and west gates while he himself checks the south gate. He also asks Tristan to tell them everything he knows about the fourth member. Tristan reveals to them that his name is Gawain and that he wears armor and has golden magic, despite knowing nothing else since he never took off his armor since he met him. Lancelot inquires that Tristan is hiding something else, which Tristan denies, though seeing Lancelot read his mind, he reveals that Gawain is a blood relative of King Arthur. Although Tristan is alarmed that this information will wreak havoc between them, Lancelot says that it is better to know in advance.

Tristan arrives at the site where Gawain and Percival were fighting Pellegarde by following Gawain's magic. Tristan berates Gawain for disobeying his orders to wait for him. When Percival tells him that Pellegarde is a knight from Camelot, Tristan manifests his demon and goddess powers, leading Pellegarde to deduce that he is the one with "light and dark in his eyes" of the Four Knights of the Apocalypse.

As everyone have different opiniones about what to do with Pellegarde, with Tristan suggesting take him prisoner, Percival decides to talk to him, giving him the opportunity to kidnap him, leaving the rest trapped in a Perfect Cube. Tristan berates Lancelot for not using his magic to stop him, to which Lancelot points out that he would have harmed Percival as well. When Gawain uses Absolute Cancel to nullify the Perfect Cube, Trsitan takes flight to go help Percival.

Tristan comes to Percival's aid after Percival is beaten by an upset Gawain for his interference in Pellegarde's death. While healing Percival, Tristan berates Gawain for attacking a comrade, but Gawain denies being on the same level as them and that he never intended them to become friends, provoking Tristan to attack her, but the prince refuses to raise his swords against an ally. Gawain simply shoves him out of the way by calling him a wimp and when Percival gets upset with Gawain, Tristan tells him not to piss her off anymore. However, Pellegarde intervenes and Tristan watches in amazement as he overpowers Gawain. When Pellegarde decides to retreat after a tantrum from Gawain, Tristan allows him to, having saved Percival and not wanting to fight a wounded man, but warns him that he won't do it again. Tristan then comforts Gawain for her defeat by praising her and assuring her that he will win the next one, which brings her spirits back to her.

Tristan feels a strong demonic magic in Liones, so Gawain teleports him and Percival back to the kingdom. Confronting a resurrected Galand and Melascula, the both recognizes Trsitan mixed magic by its simlarity with Meliodas's and Elizabeth's.

Upon evading Galand's attack, Tristan is surprised by Melascula who traps him in her Attan no Mayu. However, Tristan breaks free enchanting his sword with Ark, claiming the she will never defeat them. He warns Melascula that she should surrender as Galand has already been defeated, but Melascula creates a creature of demon and goddess souls, rendering it immune to Tristan's Ark. Melascula talks about the repulsiveness of Tristan being a Nephilim, though she sees that in appearance and magic he is more like his mother though he is nowhere near her in power. Tristan happily agrees with her statement and asks her to tell him about when her mother was called "Bloodstained Ellie". Melascula recoils surprised by his attitude, noting that Tristan doesn't resembles his father, to which the boy agrees as well.

When Lancelot tricks Melascula into assuming her giant snake form, Tristan is forced to unleash his demonic power to finish her off. Melascula then says that Tristan is actually a monster like his father, to which Tristan says that's why he doesn't like using that power.

Abilities/Equipment
At age 10, Tristan is shown to possess above average combat skills, both barehanded and with a sword. Gowther claims he possesses an impressive Power Level for a boy of his age.

At age 16, his combat abilities seems to have improved greatly. He is also shown to have inherited Goddess powers from his mother and Demon powers from his father, and the ability to manifest them separately or simultaneously.

Abilities

 * An archetypal magic technique of the Goddess Clan that counteracts darkness by disintegrating it with light particles.


 * Flight: Tristan can manifest two pairs of Goddess wings to fly.


 * Demonic Mode: Tristan can enter this state to presumably gain more power to dispatch enemies. However he has stated that the amount of time he can use it is limited, plus he doesn't like using it.


 * Full Counter: Tristan has also inherited the ability to reflect magic attacks aimed at him, back at the enemy, but with much greater power; therefore, the stronger the opponent's powers are, the rebound becomes.

Weapons
Tristan uses a pair of blades, one black, one white. It is stated that he also owns several other swords, with his favorite pair being named "Mael" and "Estarossa".

Meliodas
Meliodas is Tristan's father. At first Tristan considered him a short, irresponsible and alcoholic person who touches Elizabeth's breast every day, but after witnessing the real story of the Seven Deadly Sins from Gowther, he comes to respect him as a hero and desires to become one of the Seven Deadly Sins. Now that he is older, he seems to harbor resistance using his demonic powers and is happy when an enemy says he and his father are not alike.

Elizabeth Liones
Tristan is shown to have a close and loving relationship with his mother as he trusts her by confiding in her when he believed his father and the other Sins to be evil traitors.

Isolde
Tristan cares about her but is unaware of her implied feelings for him. Tristan think she's earnest and straightforward.

Trivia

 * was one of the more notable members of King Arthur's . He was the son of King Meliodas and his first wife Elizabeth. He is well known for being an excellent archer with his bow Failnaught, and especially for his tragic romance with.
 * Tristan is ambidextrous.
 * Despite being initially stated by the author that the Nanatsu no Taizai series sequel (Four Knights of the Apocalypse) would be centered around Tristan, as of the initial arc, a new original character was introduced as the main character instead. However, despite not being the protagonist, Tristan is featured within this main group, as well as being a key focus in the both the prophecy and the story as a whole.