Hideo Shimada  

, 島田 秀雄

Hideo is an alien being who takes on the appearance of a teenager. He decides to blend in with human society by attending Shinichis high school. Although Hideo generally maintains a calm demeanor, he has no qualms about resorting to violence when necessary, such as against bullies who try to pick fights with him. Despite this, Hideo continues to hunt humans for sustenance, although he claims that he is learning to eat normal food instead of the parasitic substance that sustains his species.