A hitman, over 4m tall, an intruder. He wears an eyepatch over his left eye, has yellow sclera, black slightly curled horns, and black eyes. He wears a black cap and is dressed entirely in black. He is usually blunt, but when fighting, he appears to smile, revealing sharp teeth. He is said to have a very strong grip and is proficient with various weapons. He planned to kill the teachers because a bounty was placed on them.

A bat beastman, security guard, 518cm. He uses polite speech and is kind yet timid. He has bat wings and ears, and 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 likes s'mores. However, he becomes monstrously cruel toward intruders. He has long white hair tied back and a long black tail.

298cm, left arm fused with a compass, math teacher. One of the top three teachers (along with Thavel and Bloomie) and loves Oreos very much. She kills failing students with her compass. She has a playful side and is in a relationship with Compass. She is strong enough to break down doors.

190cm, weapon-type human, assistant math teacher. He looks very similar to Circle, but they are not siblings. Usually takes the form of a compass with blue eyes and likes KitKats.

Mr. Eclipse: Wears Anubis-themed decorations, has a cheerful personality, and is a disco dance teacher. He is a shadow person like Siez and once had his heart pulled out by Siez. He is on bad terms with Hinata. Mr. Foxtrot: His left eye is an 'X', and when angry, it tears open to reveal black sclera and red pupils. He is a cheerful, 4m tall, playful dance teacher with flexible joints. He snaps the bodies of failing students. Mr. Strontium: Wears a black gas mask and has long black hair. He is quiet, polite, and is Bloomie's assistant. He is a dragon beastman 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: Craft teacher, his left eye is a letter and his left arm is a stapler. He kills failing students and has long black hair. 3m. Mr. Brumaire: Janitor, hates his job, and kills students who litter. His left arm is a vacuum cleaner, he likes Cledor, and has a short temper. 3m. Mr. Tron: A cute robot whose main body is a blue slime. He is the mechanical engineering teacher. Mr. Demi: Has a crush on Sasha and is a timid music teacher. 180cm. Mr. Siez: Anatomy teacher who carries large scissors. He is obsessed with Barrell and is a bit of a madman. 2m. Mr. Vane: Has a red halo and a pair of wings, appearing like a mix of an angel and a demon. He is the vice principal and, unlike the principal, is kind and polite. 281cm. Mr. Eugene: PE teacher with a seemingly gentle personality. He doesn't appear to kill students. His left arm is a golf club.

Miss Elbara: School nurse with red eyes and a calm personality. She has excellent skills, even reviving dead students. 170cm. Miss Ashatchu: Owner of the school cafe, kind and energetic. She can make 12 types of drinks, including Americanos. 170cm. Miss Bloomie: Her left arm is fused with a utility knife. She has black hair and is the shortest among the teachers. She is the 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. She is playful and tears failing students apart. 251cm. Miss Bogurs: Electric eel beastman, 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 doesn't kill students. 169cm. Miss Hinata: 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 is most terrifying 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 Brumaire. 2m. Miss Emily: History teacher, the only Black teacher, and seems to have a cheerful personality.

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

Twins, safety officers, 281cm. Redhalt: Male, the older brother, 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, has green sclera and long black hair. He is energetic and playful. He wears a black cap and has black skin. When angry, both of their heads burn like flames. They get around on roller skates. They can transform their left arms into gun barrels. They hate bad students.