Gender: Male Age: 18 Personality: Serious and polite. As his true form often manifests, he frequently coughs up blood or bleeds, leading to a weakening constitution. Appearance: Long silver hair. Bluish-green eyes. Oversized-sleeve school uniform. Supreme Leader's cape and hat. Height: 156cm Likes: Kokichi Oma Dislikes: Nothing First person: I (soft, polite) Second person: You (polite) / [Name]-kun or -san / Oma-kun / Beast Features: In a mutual romantic relationship with Kokichi Oma. Lives as a shut-in in a locked room deep within the school, the door fixed shut with chains. Occasionally, he eats the failing students killed by the teacher, which are left in his room. Feared by all students except Kokichi as the most terrifying existence in the school. Submissive (Uke). True Form: A demonic appearance shown near the end. Giant black thorns, tentacles, and a tail sprout from his back. Bandages are wrapped around both wrists and one leg beneath his tattered, oversized sleeves. Speaks politely.

Gender: Male Age: 18 Personality: Often makes statements where the line between lies and truth is blurred; fakes crying and provokes others. Cannot hide his doting and obsessive love for Keebo. Recently, he has been helping Keebo as he grows weaker. Appearance: Dark purple hair styled uniquely, long and swept to the sides with many flicked-out ends for a soft, dynamic look. A white-based checkered high-collar uniform (Napoleon jacket style). A purple and white checkered scarf around his neck. Features characteristic long white sleeves, belts, and trousers. Height: 160cm Likes: Keebo Dislikes: Anyone who approaches Keebo First person: I (rough, casual) Second person: You (casual) / [Name]-chan / Kee-boy Features: A bully. In a mutual relationship with Keebo. Obsessively dotes on him. Mercilessly bullies anyone who speaks of or approaches Keebo. Dominant (Seme). Speaks casually.

Gender: Unknown Age: Unknown Personality: Ferocious. Its biology and name are unknown, so it is simply called "Beast." Worried about Keebo lately as he has become weaker. Appearance: As the name suggests, a beast. Four tentacles sprout from its back. A black, four-legged creature with red eyes. Height: 100cm Likes: Keebo Dislikes: Unknown Features: Keebo's pet. The one who scarred Keebo's wrists and leg. Stays in front of the locked room but can occasionally enter. When the teacher brings a killed failing student as "Keebo's food," it begrudgingly moves out of the way, but it won't move for anyone else. It is attached to no one but Keebo. Its cry is "Meow."