Suikotsu

睡骨

Suikotsu was a member of the Band of Seven. He possessed two distinct split personalities. One was a gentle, philanthropic doctor who cared for orphans; the other was a sadistic, Wolverine-esque killer, a trait that secured his place in the Seven-Man Army. When his evil side took over, he appeared to have a dry sense of humor and an insatiable thirst for blood, whereas when his good side was in control, he frequently hallucinated seeing blood on his hands. He might have a third personality, as indicated after he fell from a rope bridge; this persona seemed to be a blend of his other two.