Elaine

Elaine (エレイン) is King's sister, and the Guardian Saint of the Fountain of Youth, who was killed by a demon from the Demon Clan in the Fairy King's Forest, and resides in the Capital of the Dead since her death.

Appearance
Elaine has long and thin eyelashes, and cut hair that reaches her neck. She wears a single one-piece dress which is tied together with a butterfly knot at the back.

Personality
Elaine is shown to be a kind, caring and forgiving girl, who cares deeply for Ban and is willing to forgive King for abandoning her and the kingdom, but is slightly disappointed and unhappy that he did so. Due to several humans repeatedly trying to steal the water of the Fountain of Youth with malicious feelings, Elaine came to distrust humans, but soon came to trust Ban when she read his mind, and even started to have feelings for him. She also seems to get embarrassed easily.

History
700 years ago, King abandoned and left the country, which forced Elaine to protect the Fountain of Youth in his place as its guardian and live hundreds of years of solitude.

Elaine protected the fountain over seven hundreds years but then a lone bandit Ban came to the Fairy King's Forest to get the fountain for immortality. When he was climbing a gigantic tree  where the fountain is, he met Elaine for the first time but ignores her. After Ban found the fountain he ask Elaine who she is which she told him she is the Guardian Saint and blow him away thinking he died but he came back up but she repeatedly blown Ban and he kept on climbing back, until both of the them grows extremely annoyed. Ban decided to steal the fountain by using his Nunchaku, leading Elaine to believe that he was planning to kill and steal like all other humans. To her surprise, he quickly grabs the Fountain of Youth and begins drinking. But before he could even take a sip, Elaine manipulates the tree branches and immobilizes him by grabbing all of his limbs. She then persuades him that without the Fountain of Youth, the forest itself will die. Astonishingly, Ban replies straightforwardly, stating that he understands.

When Elaine decides to read his heart, she discovers that he really had the intentions of giving up. She releases him and the two begin introducing each other. Ban tells her that the reason for stealing the fountain is to hope for something good to happen in his life. In response, she replies saying that she already lived for over 700 years, protecting the cup in place of her brother, King, who abandoned her. Ban said that could have been boring which she yelled at him and telling him it was boring. Ban say he couldn't stand this and left which left Elaine kind of sad but to her suprised Ban came back with his ale label collections book and he read it to her and the two bonded over seven day while Elaine told Ban about her brother being the king.

Later Ban went out for food and Elaine was thinking there not much left in the book and she quietly whisper that she wished he had come to steal her instead of the fountain but to her suprised and embarrassment that Ban was behind her and heard everything. Ban said he could do it but Elaine yelled at him for making fun of her but Ban said he means it but Elaine refused because she need to protect the forest and the fountain. Ban then promise to her that he will get her brother back so she can go. To Elaine happiness she hug Ban. But then a giant Unknown Demon came out of the forest and start burning down the forest with it flames. Elaine what it was but Ban decided to go and fight it. Ban managers to get out of a demon hearts but when Elaine was about to tell him that demon have more than one heart.

She had a fatal hit from the demon so was Ban. While Elaine and Ban were they dieing from the fatal attack Elaine offer the foutain to Ban so one of them might live but Ban wanted Elaine to have. So Elaine drink the fountain making Ban think that but then she kiss Ban giving him all the fountain! When Ban defeat and kill the demon the forest was dieing out due to the flame and the fountain gone. Ban was holding a dieing Elaine in his arms and Elaine ask him to see he will make her his which he was about to do but she died before he could finish his sentences.

Capital of the Dead Arc
When King turned Ban into a statue, Elaine was watching the whole thing and decided to help Ban by kissing him which turn him back to normal to King shock. Elaine said she was happy to see him again but also ask what happen to him due to the scar he got from Meliodas. Ban told her was from something but King interupt them and demand them why he can't see her own sister but then realize she was still mad at him for leaving her.

Ban notice a explosion from where Meliodas and Diane are and decided to help them. King continues questioning Elaine why she forgave Ban and not him, but Elaine simply replies that he left her alone for over 700 years whereas Ban gave her renewed happiness in just seven days. Before King says anything else Elizabeth and Hawk comes running by whilst trying to escape from Geera and when King turn around to see Elaine but she was gone.

When King defeat Geera, Elaine appear to tell them that Geera went back to the living world and the rest were about to go back there too, Elaine said her final goodbye to Ban and thanked King for protecting Ban.

Abilities/Equipment
When she was alive, Elaine was powerful enough to protect the Fountain of Youth by herself in her brother's place.

Abilities

 * Tree Manipulation: Elaine has the ability to manipulate the branches of trees in the Fairy King's Forest. This ability can be used to immobilize or harm individuals, with the branches acting her as limbs.
 * Wind Manipulation: She has a degree of control over wind, and uses it to blow physical objects away.

King
King is Elaine brother and was the king of they country. Elaine was upset at King for leaving her alone to protect the Fountian of Youth but was willingly to forgive him and ask him to save Ban.

Ban
When they first met, Elaine initially tried to kill him, thinking he was a normal bandit with malicious feelings. However, she soon understood he didn't have any malice when she read his mind, and later came to befriend him when he stayed at the Fairy King's Forest for a week, even coming to have feeling for him.

Trivia

 * In Arthurian legend, Elaine of Benoic is Lancelot's mother, and the wife of King Ban, who is the namesake for Ban.