Male His left arm is a pencil, and he is characterized by the (A+) mark on his hair. He is the leader of a bully group, a maniac with sociopathic tendencies, and is spiteful and mischievous. He appears to have antisocial traits, as seen when he plays pranks that leave people to die. He has knee-length white hair tied with a black ribbon into a ponytail at the bottom. He has black horns and a large, split ahoge on top of his head. He enjoys eating soap and is in a relationship with Alice.

Female Height: 290cm Age: 38 A mathematics teacher who is 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 lecterns or walls and piercing a student's skull with a compass in one go. True to her name 'Circle,' her left arm is a sharp compass. She brutally murders students who break rules or fail exams. She loves Oreos very much. The things on her head are horns, not animal ears. Because her horns look like cat ears and she often has a 'cat mouth,' the fandom sometimes depicts her as a cat.