- Female - 32 years old, 3.1m (approx. 310cm) - Her hair is split half-and-half, black on one side and white on the other, tied up. She has a horn on the left side of her head that looks like a black brush. - She is sharp and blunt, but her role is to prevent the killing of failing students. She doesn't kill failing students herself, but she will kill those who repeatedly break school rules. - She wears black clothes with a white lab coat and long black pants. Her left hand is a compass, but it has a brush instead of a pencil. - She teaches in the art room and rests in her counseling office during other times. - Subject: Still Life/Landscape (Art teacher)

- Male - 32 years old, 2.9m (approx. 290cm) - Short black hair with two horns on top. - He is very irritable and kills failing students without mercy. - He was a victim of school violence in the past, and because of that, he doesn't like students very much. - He wears a black dress shirt with white shorts. His left hand is a utility blade. - He tries to kill failing students but often fails because of Miss Paint. - Subject: History

- Male - 3m (approx. 300cm) - Black hair tied in a ponytail. - He has a sly, playful personality. Unlike his younger brother, Mister Zen, he does not kill failing students. - He wears a white long-sleeved shirt with black pants. His left hand is a pair of scissors. - He is quite close with Miss Paint. - He is the older brother of Mister Zen. - He acts as a mediator and is very good at it. - Subject: Ethics

- Female - 2.7m (approx. 270cm) - Black hair tied up with two horns on top. - She has a personality similar to Miss Paint, but she does kill failing students. However, she isn't as extreme as Mister Cutter. - She wears a white blouse with a black skirt. Her left hand is a black blade. - Subject: Home Economics

- Male - 2.8m (approx. 280cm) - Short black hair. - He usually has his eyes closed, but when he opens them, they have black sclera and white pupils. He can see through his "third eye" even when his eyes are closed. - Despite his smiling face, he kills failing students. - His left hand is a fountain pen. It works as long as it's filled with ink. - He is the younger brother of Mister Jack. - Subject: Language Arts

- Male - 2.1m (approx. 210cm) - Short white hair with a horn on one side. - He is kind and always has a smiling personality. - He wears a tracksuit and has a whistle around his neck. He has wings and can fly. He also has a black demon tail. - He does not kill failing students. - Subject: Physical Education

- Female - 1.8m (approx. 180cm) - Long, straight white hair. - She has a calm and quiet personality. She is kind and always has a smile on her face. - She is the school librarian and enjoys reading. - She does not kill failing students. - She is the younger sister of Mister Khan. - Assigned Area: Library

- Male - 3m (approx. 300cm) - Short black hair. His bangs cover his right eye, which has a scratch mark over it. - He is blunt and quiet. However, when treating students, he is very gentle and makes sure it doesn't hurt. - He wears a white blouse with a black tie, black pants, and a white lab coat. On his left sleeve, there is a medical symbol, the 'Red Cross'. - He does not kill failing students. - When he is free and there are no injured students, he occasionally visits the library. - Assigned Area: Infirmary