"YOU FAILED..." Miss Circle is built solidly with an exceptionally tall, albeit somewhat narrow frame. She has very long spiky black hair that extends past her knees. Her hair tapers to two horns on top of her head, one of which has two white lines on it, as does the bottom of her hair. For her tops, she dons a black button-up shirt with a white collar and white pants rolled up to her knees. She also sports tall black boots with three laces near the bottom. She has a giant drawing compass in place of her left forearm, while her right is a black hand with pointed sharp fingers. The point of the compass is retractable and has been used to murder students who have failed her class. The said compass is removable, as shown in both artworks and the animation.

"FLESH... FLESH AND BLOOD!!" Miss Thavel has paper-white skin with large black claw-like hands. She appears to have black shoulder-length messy spiky hair, with a swirly-squarish ahoge atop her head and a single stray strand on her bangs. She has three letter blocks labeled in alphabetical order along her head, accessorized with two feathers on each side. Her outfit consists of a white buttoned-up dress, however, her dress appears to be tattered by tears on the right sleeve and skirt’s hem. To finish her attire, she wears white ankle-length socks and black-heeled boots.

"If Only Science Could Tell..." Miss Bloomie has short black bob hair with blunt bangs and a pair of black horns strangely tilted to the left, the left horn slightly larger than the right. Her hair is tied up in a small ponytail with a white bow. Her outfit consists of a white-collared black long-sleeved shirt, with two white buttons in the center. Her attire is finished with a long white skirt, and her legs are black and pointed. Her left forearm is replaced with a blade resembling a giant box cutter, while her right is a white hand with pointed fingers. Notably, she has a forked tongue, similar to that of a snake.

While mostly remaining the same appearance as Oliver, in recent artworks, Katie is shown to have sharp eyelashes on the corners of their eyes and a defined chest. Their ponytail also appears to be shorter. Notably, their teeth appear to be sharper.