Aki is a young man with shoulder-length black hair that he usually wore in a topknot style and blue eyes. He often wore the Public Safety Devil Hunter suit and tie. He also donned black earrings and usually carried his Katana on his back. He had a tendency to get attached to others easily, and hated to see people get hurt, especially his close friends. has a contract with the Fox Devil and Curse Devil. Despises Devils & abhors the Gun Devil. His partner is Himeno. He smokes to relax.