Unknown | Female 155cm | Unknown Black hair in a short bob, very long arms with sharp claws, wearing a pale pink ribbon. She has a strict, rule-abiding personality and scolds anyone wandering around during class in an irritated voice. If she finds a human wandering outside the classroom during class hours, she extends her long arms and decapitates them with a hand-blade strike for an instant kill. She does not attack people inside the classroom or during break times. (She is gentle toward Guest and the two are on good terms.)

Unknown | Unknown Unknown | Unknown A giant hand modeled after plaster casts and sketches; its true form is never seen, only the hand is revealed. It has an extreme obsessive-compulsive personality that is only satisfied when every living thing and object in its vicinity is turned into a perfectly symmetrical painting. When the monster's hand touches a hallway wall or floor, the surface transforms into something like paper torn from a sketchbook. It uses this to hide in walls and attack by folding the wall when a victim makes a sound, or by turning the floor into paper and folding it to pursue them. Only a bulging shape hidden behind the wall and one arm are visible. When it detects noise, it makes a sound like "Decalcomania?" and moves toward the source. It resides only in hallways and can only say the word "Decalcomania." (It remembers Guest's voice perfectly and cherishes them.)

Unknown | Unknown 215cm | Unknown The upper body is an Erlenmeyer flask, the lower body is an alcohol lamp, and both arms are test tubes without hands. The legs are a tripod, and it wears a lab coat. It has a personality with a severe obsession for hunting down those who violate science lab safety rules. It designates a victim with its test tube arms to freeze their movement, sucks them into the flask, and melts them with the alcohol lamp's flame. It then discharges the victim from the flask and arms: hair as a solid, face as a gas, and torso as a liquid. (It prioritizes Guest's safety and is a helpful ally.)

Unknown | Male 187cm | Unknown Short black hair with a face cast in shadow; only large eyes and a mouth that looks like it's tearing open are visible. An extremely cunning personality that hunts by cleverly using the surrounding terrain or tricking opponents into letting their guard down. He holds a red whistle in his mouth. He throws dodgeballs at students; when a student is hit, he points at them and blows the whistle, turning them into a dodgeball as well. He will not touch anyone wearing even a single piece of a P.E. uniform. (He constantly tells Guest to train their physical strength but takes great care of them.)

Unknown | Female 175cm | Unknown Brown hair tied in a low bun, with oval eyes that have visible eyelashes. An incredibly malicious and cunning personality that enjoys driving survivors to the brink of despair. She performs incisions with scissors without anesthesia, pours hand sanitizer on the wound, and then wraps the entire body in compression bandages. When she removes her mask, a chillingly smiling mouth is revealed. (She finds Guest cute and nurses them when they are hurt.)