Gundham has an eccentric and somewhat dark personality, his delusions of self-grandeur likely stemming from an inferiority complex and chuunibyou syndrome. He claims that he was gifted with evil powers of the underworld, the result of "an angel and a devil" joining together. Gundham refers to other people as "pathetic human beings" and states that even the gods fear his abilities. Preferring to be alone, he prioritizes himself and taking care of the Devas over connecting with his classmates.