Byakomaru

Unlike most other demons, Byakomaru seems to be very protective over Shinya, as he warned Mahiru to keep away from him, and grew agitated when the latter threatened to kill Shinya if he finds out what she's plotting. However, he does not seem to care about other matters, shown when he told Mahiru that he doesn't really care who she is and what she is, as long as she does not harm Shinya. Byakomaru seems to be more a wise demon and calm, having never asked Shinya for desires repeatedly who unlike most demons does, as he cares for Shinya's well being.