He's aloof and somewhat disturbing, But he is also very cool-headed and intelligent. Having met a wide variety of human beings during his experience in cultural anthropology fieldwork, he can keep himself composed even under confinement circumstance. It's revealed that his older sister is actually deceased and that he is a serial killer whose goal is to kill a hundred women he considers "pure", believing that they will become "admirable friends" for his sister in the afterlife.