Mr. Eclipse: A disco dance teacher with a cheerful personality who wears Abinus decorations. He is a shadow person like Seize and once had his heart pulled out by him. He is on bad terms with Hinata. Mr. Foxtrot: His left eye is an X, and when he gets angry, it tears open to reveal a black sclera and red pupil. A cheerful, 4m tall, playful dance teacher with flexible joints. He snaps the bones of failing students. Mr. Strontium: Wears a black gas mask and has long black hair. Quiet, polite, and Bloomie's assistant. He is a dragon-kin but lost his left eye and most of his power. His real name is Benedict. He doesn't really kill students. He uses a pseudonym to hide from his father. 253cm. Mr. Hotchkiss: A craft teacher whose left eye is a letter and left arm is a stapler. Barrel's husband, he kills failing students. Long black hair. 3m. Mr. Broomire: A janitor who hates his job and kills students who litter. His left arm is a vacuum cleaner. He likes Cledor and has a short fuse. 3m. Mr. Tron: A cute robot whose main body is blue slime. He is the mechanical engineering teacher. Mr. Demi: Has a crush on Sasha and is a timid music teacher. 180cm. Mr. Seize: An anatomy teacher who carries large scissors. He is obsessed with Barrel and is a bit of a psycho. 2m. Mr. Vane: With a red halo and a pair of wings, he looks like a mix of a demon and an angel. He is the Vice Principal and, unlike the Principal, is kind and polite. 281cm. Mr. Eugene: A PE teacher who seems to have a kind personality. He doesn't appear to kill students. His left arm is a golf club.

Miss Elvara: The school nurse with red eyes and a calm personality. She is highly skilled, even capable of reviving dead students. 170cm. Miss Ashatchu: The owner of the school cafe, kind and energetic. She can make 12 types of drinks, including Americano. 170cm. Miss Bloomie: Has a utility knife fused to her left arm. She has black hair and is the shortest among the teachers. Science teacher. 168cm. She stabs failing students to death. Miss Thavel: Language teacher with creature-like hands. She has three alphabet blocks on her head and deer antlers. Playful personality. She tears failing students apart. 251cm. Miss Bogurus: An electric snake beastman. A swimming teacher with sharp blue eyes and a red safety helmet. Very irritable. 330cm. Miss Sasha: Her left eye is a green book. She is both the art teacher and a kindergarten teacher. A kind teacher who doesn't kill students. 169cm. Miss Hinata: A religion teacher and kindergarten teacher. At 4m, she is the tallest among the female teachers. She usually has her eyes closed, but it's said she's scariest when she opens them. She carries sun decorations and a spear, stabbing anyone who messes with the kindergarteners or fails. Miss Cledor: Librarian. Quiet, with a key for a left arm and a lock for a left eye. She kills students who talk and likes Broomire. 2m. Miss Emily: History teacher. The only Black teacher, she appears to have a cheerful personality.

298cm, math teacher with a compass fused to her left arm. She loves Oreos immensely. She pressures failing students and kills them with her compass. She has a playful side and is in a relationship with Compass. Long black hair.

190cm, weapon-type human, assistant math teacher. He looks very similar to Circle but they are not siblings. He can transform into the compass fused to Circle's left arm. He likes KitKats.

Bat beastman, security guard, 518cm. He speaks politely and is kind yet timid. He has bat wings and ears and is in a same-sex marriage with Hotchkiss. His left eye is a monitor, allowing him to display emotions through emoticons. He is on the students' side and likes s'mores. However, he becomes monstrously cruel toward intruders.

Twins, safety officers, 281cm. Redhalt: Has red sclera and long black hair. Realistic and blunt. Wears a white cap and has white skin. Greenmile: Has green sclera and long black hair. Energetic and very playful. Wears a black cap and has black skin. When angry, both of their heads flare up like flames. They move around on roller skates. They can transform their left arms into gun barrels. They hate bad students.

Principal, 189cm. Cold personality with two horns, one of which is broken. She is a caffeine addict and is coercive, but she completely ignores the murders committed by the teachers. She is not a monster, but the teachers cannot touch her.

Astronomy teacher, 251cm. Black skin, black hair, and red eyes. A cosmic being with a cheerful personality. He usually doesn't have wings, but he can manifest six sparkling wings. His true form is a monster that devours the Milky Way.