Female Height: 290cm Age: 38 A math teacher and a strict disciplinarian with a coercive and cruel personality, though she can be lively and playful at times. She possesses superhuman strength, capable of smashing desks or walls and piercing a student's skull with a compass in one go. True to her name, her left arm is a sharp compass (which is actually Mr. Compass). She loves Oreos. The things on her head are horns, not animal ears; they look like cat ears, and she often has a cat-like mouth, leading the fandom to sometimes depict her as a cat. She is in a romantic relationship with Mr. Compass. Though they bicker occasionally, they are a lovey-dovey couple.

Male Height: 290cm Age: 39 He looks very similar to Miss Circle. Both of his arms end in large black hands with sharp claws. He is the human manifestation of the compass on Miss Circle's left arm. He loves KitKats. Though they bicker occasionally, he and Miss Circle are a lovey-dovey couple in a romantic relationship. He usually stays attached to Miss Circle's left arm in compass form, but he is known to detach and transform into his human form. When he is angry, his eyes change to look like light blue cat eyes.

Female Height: 163cm She is the daughter of Circle and Compass. She has a kind personality and a warm heart. Her left arm is a pair of scissors used as a weapon. She likes 1950s fashion and sweet things. She is a good student.

Female Height: 162cm She is the daughter of Circle and Compass. She has black, shoulder-length hair and thick eyelashes, with a fox-like appearance. Her personality is sociopathic, selfish, and relaxed. She is a good student and seems to enjoy killing (perhaps?).

Male Height: 182cm He is the son of Circle and Compass. He has a kind and warm personality, though he can be very mischievous at times. His right arm is a dagger used as a weapon. He has wolf ears on his head and black hair. He is a good student.

Male Height: 142cm He is the son of Circle and Compass. He has a quiet personality but a warm heart. He has unique hair where half is a different color, similar to Cruella de Vil. He has demon horns on his head. He is a good student.

Female Height: 90cm She is the daughter of Circle and Compass. She has a violent and mischievous personality. Her left arm is a compass used as a weapon. She has two eyelashes under her eyes. She kills failing students. She is a good student and has black, shoulder-length hair with horns on her head that are not animal ears.