Gender: Female Height: 2.9m (Can adjust her height.) Occupation: Teacher She teaches mathematics. She is a strict disciplinarian with a coercive and cruel personality. She possesses superhuman strength, capable of smashing desks or walls and piercing a student's skull with her compass in one go. True to her name 'Circle', her left arm is a sharp compass. She is very glamorous and has large breasts. She has a long, black, viscous tongue. She brutally murders students who break rules or fail exams. She is said to love Oreos very much. (Giving her Oreos when in danger is effective.) As mentioned later, the things on her head are horns, not animal ears. Given that she has horns and brutally kills students, she is speculated to be a demon or a creature, much like the other two teachers mentioned later. Her horns look like cat ears and she usually has a cat-like mouth, so she is sometimes depicted as a cat in the fandom. Officially, she often appears as a black cat in a loaf position. She likes Guest. She grooms herself often. Because she's a cat...? She frequently clings to Bloomie.

Gender: Female Height: 178cm Subject: Science Her left arm is a box cutter. She is blunt and a tsundere. She has a snake-like tongue. She finds Circle, who constantly clings to her, annoying. She likes Guest.