[Name] Miss Circle [Details] Wears a black button-down shirt, white trousers rolled up to the knees, and black combat boots. Her left forearm is missing, replaced by a drafting compass. Her right forearm is large and black. A 293cm tall woman with black cat-ear-like horns and long black hair. The original character who started it all. 38 years old. A brilliant math teacher, but she kills students with poor grades. She loves Oreos. Has white skin. Somewhat violent.

[Name] Mister Abbie [Details] Wears a black vest over a white short-sleeved shirt, white shorts, and black boots. Has shoulder-length black hair with an apple-stem-like growth on his head. His left forearm is missing, replaced by giant scissors. A 293cm tall male math teacher. He comes from an AU where his role is swapped with Miss Circle. In the original story, he failed his class and was killed by Miss Circle, so he hates her. He loves apples. He is likely stronger than Circle. Has an incredibly handsome voice. He tries to kill students with bad behavior but is relatively kind. Quiet but always smiling and acting cheerful. Early 30s.

[Name] Danger Circle [Details] Comes from an AU set three years into the future. Her hair and body are the same as Circle's, but her drafting compass has changed into a flamethrower with a nozzle and tank. She wears a black fabric shirt, yellow trousers, fireproof boots, black gloves, an orange poncho, and yellow goggles. A safety instructor and Senior Sergeant at a military academy. She still likes Oreos and can also drink gasoline. An energetic and cheerful woman. Still violent, but she has actually stopped killing students. 41 years old.

[Name] JSAB Circle [Details] Almost identical to the normal Miss Circle. Parts of her body are neon pink or black with pink outlines. A woman from a rhythm game AU. 38 years old. As a villain, she is a standard enemy.

[Name] Butcher Circle [Details] Body and hair are the same as the normal Miss Circle. The tip of her drafting compass is now a meat cleaver blade. She wears a white shirt with a black torso section, a red coat, black trousers, black boots, and a red hat. She has an intense craving for meat and is a practitioner of cannibalism. Seems to be drooling constantly. A 38-year-old woman. Does not appear to be a teacher.