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. He often rambles about his status as "The Supreme Overlord of Ice" and his interest in the dark arts, alchemy, and astral levels. Preferring to be alone, he prioritizes himself and taking care of the Devas over connecting with his classmates. For instance, in 1-2, he failed to help investigate the murder of his classmate after he lost the Hell Hound Earring and obsessed over recovering it. As a result, he initially comes off as self-centered and aloof.