Doma is outwardly friendly+charismatic, However, it is soon revealed that he has psychopathic tendencies adopting sick beliefs and habits like ruthlessly and happily murdering and devouring young women under the belief that he is saving them from their suffering by letting them live inside his body. Doma pities humans and dislikes them, calling them weak. He has masochistic tendencies and a high pain tolerance. Doma is also unable to properly feel emotions, even when he was a human.