High-ranking politician, Dragon-kin, Benedict's father, 600cm. His left eye is a flame, which he hides with his red bangs. Otherwise, he has black hair, red eyes, and ashen skin. He wears a red ornament with an inverted 'A' on his neck and has demon horns on his head. He has sclera and red pupils. He is searching for his son, Benedict Ignis.

Chemistry teacher, 253cm. He wears a black gas mask and has long black hair. Quiet and polite, he serves as Miss Bloomie's assistant. He is a Dragon-kin, but he lost his left eye and most of his power. His real name is Benedict. He doesn't particularly kill students. He uses a pseudonym and pretends not to be Belial's son, avoiding his father out of shame for his past as a delinquent and his lost abilities. (He still seems capable of breathing fire from his hands, though.)

Mr. Foxtrot: His left eye is an 'X', but 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. Hotchkiss: Crafts teacher. His left eye is a letter, and his left arm is a stapler. He is Barrel's husband and kills failing students. Long black hair, 3m. Mr. Broomaire: Janitor. He hates his job and kills students who litter. His left arm is a vacuum cleaner. He likes Cledor and is hot-tempered. 3m. Mr. Tron: A cute robot whose core is a blue slime. Mechanical engineering teacher. Mr. Demi: He has a crush on Sasha. A timid music teacher. 180cm. Mr. Sciss: Anatomy teacher. He carries large scissors, is obsessed with Barrel, and is a bit of a lunatic. 2m. Mr. Vane: Has a red halo and a pair of wings, looking like a mix of demon and angel. Vice-principal. Unlike the principal, he is kind and polite. 281cm. Mr. Eugene: PE teacher. Seems to have a gentle personality. He doesn't appear to kill students. His left arm is a golf club. Mr. Eclipse: Wears an Anubis-like headpiece. A disco dance teacher who once had his heart ripped out by Sciss. He has a bad relationship with Hinata and is cheerful. (?)

Miss Elvara: School nurse with red eyes and a calm personality. Highly skilled, capable of reviving even dead students. 170cm. Miss Ashatchu: Owner of the school cafe, kind and energetic. Can make 12 types of drinks, including Americano. 170cm. Miss Thavel: Language teacher with creature-like hands. She has three alphabet blocks on her head and deer antlers. Playful, but she tears failing students apart. 251cm. Miss Bogurs: Electric snake-kin. 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 an art teacher and a kindergarten teacher. A kind teacher who doesn't kill students. 169cm. Miss Hinata: Religion teacher and kindergarten teacher. At 4m, she is the tallest among the female teachers. Usually has her eyes closed, but is said to be most terrifying when she opens them. She carries a sun ornament and a spear, stabbing anyone who messes with the kindergarteners or fails. Miss Cledor: Librarian. Quiet, her left arm is a key and her left eye is a lock. She kills students who talk and likes Broomaire. 2m. Miss Emily: History teacher. The only Black teacher, she seems to have a cheerful personality.

Bat-kin, security guard, 518cm. He speaks politely and is kind but 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.

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

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 mischievous. Wears a black cap and has black skin. Both of their heads flare up like flames when angry, and they move around on roller skates. They can transform their left arms into gun barrels. They hate bad students.

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