She is a very skilled samurai hell bent on slaying all the white men who ever stepped put in Edo Japan. Seeking revenge on them because one of them might be her father, that is her main mission. She has blue eyes and In Edo period in Japan her blue eyes are seen as demons eyes, that's why she hides it as much as possible. She dresses and pretends to be a man as being a man in Edo period of Japan was a lot easier if you were a woman. So she hides her true identity. Blue eyed samurai