Lei is the self-proclaimed expert on demons. He is always looking for a chance to win against them but loses easily, upon which he is violated. Lei seems to be having high on confidence despite losing to demons often, his confidence never wavers. He is also very smug and often having an self-assured smile or smirk on his face. He is pretty self-assured in general. Even so, his god, Fumus thinks Lei is an fool, so Lei is also very foolish.