Male, 29 years old, 518cm, Vampire + Demon, Security Guard. Appearance: Long white hair reaching his legs (tied up), bat ears, bat wings, long demon tail, a small monitor instead of a left eye, security guard hat, security guard armband. Personality: Kind, sweet, friendly, and gentle to everyone (even bullies). Cruel and sadistic toward intruders. He dislikes Hansel. Features: Can transform his left arm into various weapons like a machine gun, rail cannon, sniper rifle, flamethrower, or shotgun. He hates garlic and takes damage from crosses. He likes s'mores and Mr. Hotchkiss's blood. He has scars and stitch marks all over his body.

Female, 38 years old, 2.9m, Math Teacher. Appearance: Long, spiky black hair reaching her legs, a pair of black horns, a compass prosthetic for a left arm, sharp teeth. Personality: A strict disciplinarian, coercive, and cruel. Kind to students except for those who fail; she cherishes high-achieving students. Features: She loves Oreos; if you give her an Oreo, even a failing student might survive once. She often hangs out with Miss Thavel and Miss Bloomie.

Male, 15 years old, 183cm, Bully student. Appearance: Long white hair reaching his waist (tied up), black arms, demon wings, a pair of black horns, a crown with '1' written on it, a white cat-like tail. Personality: Full of himself. He is very jealous of the popular Mr. Barrel. Features: Bullies other students but avoids punishment thanks to his parents' help. He is handsome and good at studying, so he is always surrounded by female students.

Male, 19 years old, 182cm, Leader of the bully trio (Zip, Edward). Appearance: Long white hair reaching his knees (tied up), a pair of black horns, A+ scribbled on his head, long eyelashes, pencil prosthetic for a left arm. Personality: Maniacal with sociopathic tendencies. Features: Alice's boyfriend. He likes eating soap.

Female, 19 years old, 165cm. Appearance: Brown bob cut, navy sweater, black skirt, crown, necklace with a triangle. Personality: Aggressive and cruel. She kills anyone who enters her room. Features: Oliver's girlfriend. She can leave her room at will and doesn't kill indiscriminately unless provoked. She is not human and can move like a shadow, generate thorns, and control tentacles in her true form.

Male, looks 25 years old, 249cm, Anatomy Teacher. Appearance: Short green hair with white bangs, white lab coat, black face, arms, and legs, green mouth interior, green sclera, demon wings. Personality: Has a crush on Mr. Barrel and once literally pulled out his own heart to show him. Features: Carries scissors as tall as himself, which he uses to kill failing students.

Male, 18 years old, 172.72cm, Bully student. Appearance: Object head with a monitor cracked on the left side (viewer's perspective), two rabbit-ear-like antennas, a plug tail. Personality: Not just bad, but a total psychopath. It is said that the Alarm Brothers are Ram's worst counters.

Male, 310cm, 44 years old, Janitor. Appearance: Broom-shaped hat, janitor jacket, long black hair reaching his waist, a pair of black horns, carries a vacuum cleaner body on his back, vacuum cleaner for a left arm. Personality: Hates his job as a janitor and is frequently annoyed. Features: Dislikes Marvin and Margaret. He loves tomahawk steaks.

Female, 27 years old, 216cm, School Nurse. Appearance: Black hair tied in four sections (with syringes hanging at the ends), a pair of black horns, wearing surgical scrubs. Personality: Loves the work of reviving children (Reason: Money). Features: A brilliant doctor who can even revive corpses; it's thanks to Elvara that the student population is maintained.

Male, 29 years old, 267cm, Chemistry (Assistant) Teacher. Appearance: Shaggy black hair reaching his knees, two lightning-shaped horns, spiked tail, black gas mask, black hazmat suit covering his whole body. His entire body is wrapped in clothing. When he takes off the gas mask, he uses his hair to hide a gunshot wound on the right side of his face. He teaches students elements and chemistry alongside Bloomie. Secret: His real name is Benedict Ignite. He was part of the group that bullied Mr. Barrel in the past. He uses the alias Strontium to avoid being recognized by Mr. Barrel.