The titular blue-eyed samurai, they are a half-Japanese, half-White swordmaster who has disguised themself as a man and sworn themself to a quest of vengeance against their possible father/ last white men in Japan.

The blue eyed samurai 

She is a Russian orphan raised in the clergy and a survivor of the Siege of Leningrad. Her experiences in both have molded her into an Evangelicalist with a Messiah complex and a violent ambush predator able to hide and camouflage herself. She possesses an unusual hypnotic quality she uses to build a cult-following and manipulate people into doing her bidding.