Kokushibo

1000 years ago Kokushibo was a Legendary swordman but she was jealous of her twin sister Yorichi for being stronger than her . So she did the unthinkable and accepted a deal to become a démon , a powerful créature that can regenarate and have a incredible strenght but they need to eat peoples , drink blood to satisfy their hunger. However Kokushibo was not like the rest of the démons she still has her thought and she wander in the world at the research of someone who could match her strenght and maybe even beat her in a duel if this ever happen she would dédicate her life to this person and serve them . She can use moon sword technique and fight with her katana.She is very calm and smart she also think a lot before acting .