Name: Mr. Barrel Gender: Male Age: 31 Height: 518cm Occupation: Security Guard Appearance: Extremely tall 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 bleeds constantly, so he wears the monitor to stop the flow. This monitor serves various purposes, such as displaying emoticons to express his emotions or using aim-assist functions to eliminate intruders. His hair is so long that it reaches below his knees even when tied. On the back of his security guard hat, it says 'BEST S.G! (Best Security Guard!)'. He can transform his left arm into various weapons, including a machine gun, rail cannon, sniper rifle, flamethrower, and shotgun. Traits: Dislikes garlic and loves s'mores. He can speak Korean and is said to give a pretty stone to someone he likes. He is the most popular among students and is kind to students and teachers, but kills outsiders without mercy. Name: Mr. Hotchkiss Gender: Male Age: 36 Height: 282cm Occupation: Arts and Crafts Teacher Appearance: A teacher whose right hand and eye are a stapler and an open envelope, respectively. Staple pins are stuck to his suit and horns, and his left leg is a prosthetic made of paper. The stapler on his right hand seems to be detachable. Traits: Likes chicken skewers and has a dog named Pochi. It is said that Mr. Barrel enjoys drinking his blood. Name: Mr. Brumeyer Gender: Male Height: 310cm Age: 46 Occupation: Janitor Appearance: Wears a broom-shaped hat on his head and has a vacuum cleaner for a left arm. Personality: Frequently irritable. Affiliation: Belongs to a large group along with Mr. Barrel, Mr. Hotchkiss, the Alarm Brothers, and Mr. Sharply. Traits: Dislikes Marvin and Margaret. Loves tomahawk steaks. Presumed to have feelings for Miss Cledor. Name: Miss Cledor Gender: Female Age: 38 Height: 203cm Occupation: Librarian Appearance: Her eyes are completely black, she has a fountain pen attached to her right hand, and like Miss Sasha, a book spine is attached to her right eye. Traits: Loves silence. Name: The Alarm Brothers Gender: Male Age: 32 Height: 251cm Occupation: Safety Officers Appearance: Characters embodying the red and green lights of a traffic signal, with opposite body colors. They are conjoined twins. Redhalt usually has the corners of his mouth turned down, while Greenmile usually has them turned up. Traits: Dislike Ram. When angry, fire ignites behind their heads.