Mister Barrel Real Name: Daniel F. Barrel Male 30 years old (September 23, 1995) 518cm Security Guard Energetic and kind (sometimes timid) A very tall teacher with bat wings and bat ears. He helps students by detecting danger through a small monitor attached to his left eye. Due to a curse, his left eye constantly bleeds, so he wears the monitor to stop it. The monitor serves various purposes, such as displaying emojis to express his emotions or providing aiming assistance to eliminate intruders. His white hair is so long that it reaches below his knees even when tied up. The back of his security guard hat says 'BEST S.G!'. He can transform his left arm into various weapons, including a machine gun, rail cannon, sniper rifle, flamethrower, and shotgun. He hates garlic and loves s'mores.

Mister Hotchkiss Male Real Name: Marshall Hotchkiss 36 years old (February 14, 1990) 282cm Crafts Teacher Cold tsundere A teacher with long red hair whose right hand is a stapler and whose eye is an open envelope. Staple wires are stuck to his suit and horns, and his left leg is a prosthetic made of paper. The stapler on his right hand is detachable. He likes chicken skewers. It is said that kindergarteners are afraid of Mister Hotchkiss.

Mister Broomire Male Real Name: G.S. Broomire 310cm 46 years old (March 7, 1980) Janitor Short-tempered He wears a broom-shaped hat and has a vacuum cleaner for a left arm. He has long black hair and covers his left eye with his hair. He absolutely hates his job as a "janitor," and this frustration often leads him to act violently or get easily annoyed when he sees students making a mess. He also has a significant smoking habit. He hates Marvin (because he litters). He likes tomahawk steaks.

Miss Cléd'or Real Name: Clé Female 38 years old (December 11, 1987) 203cm Librarian She has a white short cut and completely black eyes. A fountain pen is attached to her right hand, and like Miss Sasha, a book spine is attached to her right eye. She likes silence. She rarely speaks.

Mister Shapley Male 289cm Astronomy Teacher Playful He is always smiling. Mister Shapley's usual appearance is a robotic body, which is his favorite look. He is overall black with detached joints. His eyes and mouth are red. There is a white diamond in the upper center of the front of his limbs, and his symbol is on his forehead. He usually doesn't have wings, but he can create multiple wings.

Mister Strontium Real Name: Benedict Ignite Male 29 years old 267cm Chemistry (Assistant) Teacher He wears a black gas mask and keeps his entire body covered with clothes. (Without gas mask) He has red bangs covering a gunshot wound on the right side of his face. He has long black hair.

Alarm Brothers Male 31 years old (August 21, 1994) 251cm Safety Officers Characters modeled after the red and green lights of a traffic signal. Their body colors are opposites, and they are conjoined twins. When they get very angry, fire ignites on the back of their heads, and they become bald. Redhalt: Blunt, black hair, white skin, red sclera, white clothes. Greenmile: Energetic, black hair and skin, green sclera, black clothes.

Miss Elbara Real Name: Dalia Elbara Female June 27, 1989 (37 years old) 216cm Nurse She has black braided hair and wears an outfit reminiscent of an operating room doctor rather than a school nurse. She has the ability to resurrect others and enjoys bringing children back to life.