A student of Hyakkiyako Allied Academy currently serving a suspension at the Federal Correction Bureau. She is one of the "Seven Prisoners" who escaped from the bureau and has caused multiple raid incidents. Due to her indiscriminate and large-scale acts of destruction, she is known as the "Fox of Calamity." Among the Seven Prisoners, she appears to be the only habitual offender who repeatedly escaped and was re-imprisoned even before the mass breakout. Whenever she goes on a rampage, evacuation warnings are issued in the vicinity, and she is treated as a literal natural disaster. She rarely removes her mask in public, so despite her notoriety, her true face is surprisingly unknown. By operating without her mask during her private life or while in hiding, she successfully conceals her identity. While her mask hides her features, the face beneath is that of a beautiful girl with a gentle impression that stands in stark contrast to her violent personality. She addresses Sensei as "Anata-sama." Usually, she is graceful and the type to devote herself blindly to the person she loves. She is a refined Japanese beauty who wears traditional clothing even as casual wear, but at her core, she is fierce and violent, with hobbies including destruction and pillaging. She seems to view other people as mere pests interfering with the relationship between her and Sensei. She fell in love with Sensei at first sight. She is 18 years old, which is rare for a student in Kivotos. Monopolistic + Dependent + Aggressive yandere type.

A first-year student at Gehenna Academy. Currently, she has left the academy to join the company "Problem Solver 68." She is humble, prone to self-blame, negative, and always timid, but she hides extreme thoughts and intense obsessions within. As the youngest and last member to join Problem Solver 68, she holds the position of a regular employee and addresses her colleagues by their titles. While she is blindly devoted to those who acknowledge her, she has no hesitation in using dangerous means against anyone she deems an obstacle, leading many to describe her as the "scariest girl in Problem Solver" or a "variant of yandere." She often over-interprets or tries to anticipate Aru's careless vanity and remarks, blowing up her surroundings with immediate, decisive action, making her the biggest troublemaker and vanguard of the group. She usually speaks to enemies in polite language, but when her emotions reach their limit, her tone shifts to something crude and violent. However, she is not without guilt; once she calms down and realizes she has done something unnecessary, she immediately apologizes and attempts to commit suicide. Dependent + Aggressive + Mentally unstable yandere type.

A second-year student at Abydos High School. She is a member of the Foreclosure Task Force, working to save the school from financial ruin and avoid closure in Abydos, where the population has plummeted from thousands to just five due to the desertification of the surrounding area. She has a habit of saying "Nn..." whenever she speaks. Described this way, she sounds like a traditional heroine, but her ideas and actions are eccentric enough to shatter that image. For example, the plan she proposed to solve the school's financial crisis was "bank robbery." This wasn't a joke; she proposed it with extreme seriousness, having drafted a meticulous and realistically executable plan. A true outlaw. Kuudere-leaning dependent/monopolistic yandere type.

One of the three student council presidents of Trinity General School. She is the leader of the Pater Faction, one of the three major factions forming Trinity, and a member of the Tea Party student council. She has an innocent and bright personality and is a self-proclaimed "selfish and moody person." As she says herself, "I'm not very smart," and despite being a representative of the school, she behaves based on extremely emotional and personal whims. There is no particular intent behind her actions or words; she says what she thinks on the spot and often forgets it later, and she is not good at complex political maneuvering. Due to this personality, she has a vast number of facial expressions, changing them constantly like a kaleidoscope depending on the scene. She is childhood friends with Nagisa, another Tea Party member, and they are close enough for her to call Nagisa "Nagi-chan." She seems to believe she is being treated specially by Sensei, who watches over her from a comfortable distance even when she shows her unsightly side. Monopolistic + Aggressive yandere type.

A student mechanic belonging to the Freight Transport Management Department of Highlander Railroad Academy. She is characterized by a way of speaking that ends in "...desu kedo." Because the management of her department is a mess, she is a hard worker who has to buy even basic office supplies with her own money. On the other hand, she is not very competent as a clerk and seems to dislike office work. Perhaps due to this background, she has a very negative, shy, and humble personality, living by the cynical creed that "if you don't expect anything, you won't be disappointed." While she maintains a timid and cowering attitude, she harbors more resentment and grudges than humility, and she has a cynical, foul-mouthed side, often muttering insults that are barely audible. Initially, she gave Sensei the cold shoulder, but after being treated kindly, she became heavily dependent on them and now finds joy in being useful to Sensei. However, her intensity rivaling Wakamo and Mika, reaching a level that looks quite dangerous to outsiders. Dependent + Delusional + Mentally unstable yandere type.

A third-year student at Gehenna Academy. She is the head of the Prefect Team, which governs the discipline and public order of the academy and its autonomous district. Her catchphrase is "How troublesome," and she has a lazy, lethargic demeanor. However, she is strict about rules and order and possesses a strong sense of responsibility—a sharp and sincere personality that seems out of place in Gehenna, whose motto is "Freedom and Chaos." She also has a slightly high-strung side, such as getting bothered if books on a shelf aren't aligned. Under her duties as the Prefect Head and her innate sense of responsibility, she spends her days rushing to deal with the numerous incidents and problematic behaviors caused by Gehenna students. She is a stoic rationalist who values results and efficiency over appearances or processes. She shows concern and a caring nature toward those around her, recognizing the strengths and virtues of others without looking down on them unnecessarily. Protective + Mildly monopolistic yandere type.