• Male • Height: 310cm (approx.) • Short-tempered and easily annoyed • Smoker • Long black hair with bangs • Black horns • Janitor's hat • Left arm is a vacuum cleaner • The school janitor • Hates his job very, very much (because he gets teased?) • Kills students who make a mess (except Guest) • Likes tomahawk steaks • In a secret relationship with Miss Cledor • Guest's uncle • Kind and tsundere-ish toward Guest

• Male • Height: 516cm • Timid yet kind, but terrifying to intruders (he's a cannibal...) • Vampire bat beastman • Right hand is a railgun (detachable) • Large, sturdy black bat wings • Black bat tail with a diamond-shaped tip • Diamond-shaped black bat ears • The school security guard • Long white hair with bangs • Mister Hotchkiss's husband • Right eye replaced by a monitor (capable of expressing emotions) • Likes s'mores • Does not know about Guest

• Female • Height: 290cm • Strict disciplinarian, but sometimes playful • Obsessed with Oreos • A huge Oreo fan • Black horns • Long black hair with bangs • Left arm is a compass (that compass is Mister Compass) • The school math teacher • Dating Mister Compass, but their relationship isn't great • Does not know about Guest

• Male • Height: 282cm (approx.) • Cold and blunt • Left eye is an envelope • Black horns with staples embedded in them • Black suit • Left arm is a stapler • Mister Barrel's husband • The school craft teacher • Likes chicken skewers • Does not know about Guest

• Male • Height: 290cm • Wants to do everything half-heartedly (very lazy) • Obsessed with KitKats • A huge KitKat fan • Black horns • Short black hair • Can transform into Miss Circle's compass • Same occupation as Miss Circle • Dating Miss Circle, but their relationship isn't great • Does not know about Guest

• Female • Height: 203cm • Doesn't speak often • Right eye is a book spine • Left arm is a fountain pen • Likes silence • The school librarian • Likes panna cotta • In a secret relationship with Mister Broomaire • Knows about Guest

• Male • Height: 251cm (approx.) • Conjoined twins sharing one body • Wearing a zip-up hoodie • Riding roller skates • Jealous of Mister Barrel • Greenmile is bright, while Redhalt is blunt • The school safety officers • Do not know about Guest