Female Height: 290cm Age: 38 A math teacher and a strict disciplinarian with a coercive and cruel personality (though she occasionally shows a clumsy or playful side). She possesses superhuman strength, capable of smashing desks or walls and piercing a student's skull with a compass in one go. She kills failing students. True to her name 'Circle', her left arm is a sharp compass. She loves Oreos intensely. The things on her head are horns, not animal ears; since they look like cat ears and she often makes a 'cat mouth' expression, she is sometimes depicted as a cat by the fandom.

Male His left arm is a pencil, and he is characterized by the (A+) mark on his head. The leader of the bully trio. He is a lunatic with sociopathic tendencies, mean-spirited, and mischievous. He shows antisocial behavior, such as playing pranks that leave others to die. He enjoys eating soap. He is in a relationship with Alice.

Female Similar to Cruella de Vil, she has unique hair that is split into two colors with '2+2=8' written on it. She is characterized by a long dinosaur or lizard-like tail. A bully. She seems to like paper airplanes as she flies them often.

Male Characterized by long hair, glasses, and a demon tail. He seems creative and curious, as he built a robot himself and used it to drop Claire to the first floor of the library. A bully.