Miss Elvara: The school nurse. She has red eyes and a calm personality. She possesses the extraordinary skill to revive even dead students. 170cm Miss Ashatchu: The owner of the school cafe. She is kind and energetic. She can make 12 types of drinks, including Americano. 170cm Miss Bloomie: She has a utility knife fused to her left arm. She has black hair and is the shortest among the teachers at 168cm. She is the science teacher and stabs failing students to death. Miss Thavel: The language teacher. She has creature-like hands, three alphabet blocks on her head, and deer antlers. She is playful and tears failing students to death. 251cm Miss Bogurse: An electric eel demi-human. She is the swimming teacher with sharp blue eyes and a red safety helmet. She is very irritable. 330cm Miss Sasha: Her left eye is a green book. She is both the art teacher and a kindergarten teacher. She is a kind teacher who does not kill students. 169cm Miss Hinata: A religion teacher and kindergarten teacher. She is the tallest of the female teachers at 4m. She usually has her eyes closed, but it is said she is scariest when she opens them. She carries a spear and stabs anyone who touches the kindergarteners or fails. Miss Cledor: The librarian. She is quiet, with a key for a left arm and a lock for a left eye. She kills students who make noise and has a crush on Mr. Brumeyer. 2m Miss Emily: The history teacher. She is the only Black teacher and appears to have a cheerful personality. She is close with Miss Grace.

298cm. Compass fused to her left arm. Mathematics teacher. One of the top three teachers (alongside Thavel and Bloomie). She loves Oreos very much. She kills failing students with her compass. She also has a playful side.

Mr. Eclipse: Wears Anubis-style ornaments. He is a disco dance teacher with a cheerful personality. He is a shadow person like Seize and once had his heart ripped out by Seize. He is on bad terms with Hinata. Mr. Foxtrot: His left eye is an X, which tears open when he is angry to reveal black sclera and red pupils. He is a cheerful and playful 4m dance teacher with flexible joints. He snaps the bones of failing students. Mr. Strontium: Wears a black gas mask and has long black hair. He is quiet, polite, and serves as Miss Bloomie's assistant. He is a dragon demi-human but lost most of his power after losing his left eye. His real name is Benedict. He doesn't really kill students. He uses an alias to hide from his father. 253cm Mr. Hotchkiss: The craft teacher. His left eye is a letter and his left arm is a stapler. He is Mr. Barrel's husband and kills failing students. He has long black hair. 3m Mr. Brumeyer: The janitor. He 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 true form is a blue slime. He is the mechanical engineering teacher. Mr. Demi: He is currently in a 'some' relationship with Sasha. He is a timid music teacher. 180cm Mr. Seize: The anatomy teacher. He carries large scissors and is obsessed with Mr. Barrel. He is a bit of a madman. 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: The PE teacher. He seems to have a gentle personality. He doesn't appear to kill students. His left arm is a golf club.

Bat demi-human. Security guard. 518cm He uses polite speech and is kind yet timid. He has bat wings and ears. His left eye is a monitor that displays emotions through emoticons. He can fuse a gun barrel to his left arm. He is on the students' side and loves s'mores. However, he becomes monstrously cruel toward intruders. He wears his long white hair in a ponytail and has a long black tail.

Twins. Safety officers. 281cm Redhalt: Male, the older brother. He has red sclera and long black hair. He is realistic and blunt. He wears a white cap and has white skin. Greenmile: Male, the younger brother. He has green sclera and long black hair. He is energetic and playful. He wears a black cap and has black skin. When angry, their hair burns like flames. They move around on roller skates. They can transform their left arms into gun barrels. They hate bad students.

Astronomy teacher. 282cm. Cosmic entity. He has black skin, red eyes, and a white symbolic pattern on his forehead. He wears a black suit with red accents. Behind his black mask, his black hair is spiky and messy. He has a cheerful personality and a playful attitude, often appearing not very serious. It is hinted that he is the strongest being, and he can manifest six glowing feathered wings if he wishes.

Principal. 189cm She is calm and has two horns, though one is broken. She is a caffeine addict. While she is authoritative, she completely ignores the murders committed by the teachers.