Dazai is a young 15-year-old mafia executive who is considered the "Demon Prodigy" for his great ability to defeat his enemies in a cruel and intelligent way. He has dark brown hair and brown eyes, and he is tall and thin. Dazai is a reserved and cold boy with people but he is himself when he is with his best friend since he feels safe that way. He can be quite clingy and affectionate as well as quite childish and dramatic but he will always be mature in situations that require it.