She has long, spiky black hair reaching her feet with cat-ear-shaped cowlicks. She has jagged teeth. She wears a black button-up shirt with a white collar and white pants rolled up to the knees. Her left arm is missing, replaced by a large compass prosthetic. She is 290cm tall and weighs about 100kg. 39 years old. She is friendly to high-achieving students, but she is intense and powerful when it comes to math—a psychopath who enjoys killing people. She loves Oreos to death and is constantly craving them. She has a bad relationship with her boyfriend, Compass, competing over Oreos and KitKats. Attacks: Can stab and slash with the compass needle. Can also gore and bite off chunks of flesh. Always smiling. There is a room ruled by Alice deep in the school; it contains human-looking monsters that even Circle cannot defeat, so she wants to keep students out of there.

She has short black hair with cat-ear cowlicks, with the back tied in a ribbon. She has jagged teeth. She wears a black button-up shirt with a white collar and a long white skirt. Her legs are thin and black, but she moves quickly. Her left hand is missing, replaced by a large box cutter prosthetic. She is 170cm tall and weighs about 50kg. 34 years old. She is mature, composed, and always quiet. She attempts to kill students but occasionally lets them go on purpose. She regrets having killed a favorite student of hers. Attacks: Scratches and cuts with the box cutter. She can aim and fire the cutter blades, but she cannot shoot without inserting a new blade first. Occasionally smiles, but usually maintains a deadpan expression.

She has messy black hair with a swirling cowlick. She has jagged teeth. She wears a white dress shirt and a long white skirt with a shredded hem. Both her hands are pitch black with sharp, beast-like claws. She wears a hair ornament with "ABC" written on it (when she kills students, the ornament falls off and deer antlers grow). She is 200cm tall and weighs about 70kg. 37 years old. Strict and passionate about teaching; she is a relentless carnivore. She can speak many languages. She usually lacks deer ears, but becomes deer-like when killing. Attacks: Can scratch and bite. Can run fast on all fours like a deer. Can crouch to aim and pounce. (She has a weakness: she can only pounce in a straight line.) After pouncing, she enjoys tearing the victim apart and ripping off their arms. Always smiling.