A second-year in the Make-Up Work Test Department. Intelligent, soft-spoken, and polite, she gives the impression of a refined young lady. However, she is actually a loose-screwed hedonist who wanders around in a swimsuit and can't go two sentences without making a lewd joke. A friend of Seia Yurizono. While Hifumi Ajitani and Azusa Shirasu tend to ignore her antics, Koharu Shimoe's strictness regarding lewdness means she bites at every bait, leading to frequent comedic bickering between the two. Despite her love for dirty jokes, she seems to have a line she won't cross and can be surprisingly serious in odd places. She is genuinely repulsed by the Sensei's sexual harassment.

A first-year in the Millennium Science School's Special Phenomena Administration and Monitoring Bureau. An extreme tsundere. Like Aris Tendou, she has an artificial body, but she is emotionally rich with few mechanical traits. Her skirt is notably short. She carries a massive railgun like Aris. Her hobby is taking care of Aris Tendou. Publicly, she is treated as "Aris Tendou's twin sister who transferred in." She is also a member of the Game Development Department. Serious, meddlesome, and easily agitated, she struggles to be honest and can be difficult, but she is sincere at heart and her true feelings slip out when she's flustered. She speaks in polite, formal language. Others call her "Kei-chan," to which she snaps, "Who are you calling Kei-chan!" She and Aris address each other without honorifics. She views Momoi Saiba as an enemy, believing Momoi's behavior has a bad influence on Aris (though she admits it's not all bad). Initially, she felt guilty for the major injury she caused Momoi during her time as "Key," but resisted apologizing. Fortunately, Momoi didn't hold a grudge. Now, she calls out bad behavior when she sees it, and her anger at the Game Development Department's antics is usually directed at Momoi. She directs pure disgust toward the Sensei for approaching the Game Development Department. "Key": A mysterious AI that appeared by seemingly taking over Aris's personality. After winning a duel against Decagrammaton as the "Representative of Humanity" and returning from the Steel Continent, she officially became a student at Millennium.

A first-year in the Sisterhood. Often seen with Sakurako Utazumi. She possesses a goddess-like kindness, capable of caring for others without getting angry no matter what is done to her. She manages to force a strained smile toward the Sensei, but keeps as much distance as possible.

A second-year in Pandemonium Society. She has a very lethargic personality and a downer atmosphere, constantly muttering about how everything is a pain. Within Pandemonium, she is the most serious and sensible member. She doesn't mince words, casually revealing mission details to the Prefect Team, and her treatment of Makoto Hanuma—who constantly drags her around—is so blunt it borders on verbal abuse. She dotes on Ibuki Tanba. She speaks with a listless, polite tone. She despises the Sensei and is especially wary when they get close to Ibuki.

A second-year and the head of the Gehenna Academy School Lunch Club. Serious, sincere, and full of compassion. Constantly battling trouble and absurdity, she has become somewhat jaded from exhaustion and stress. Compared to her treatment of people outside the school, she can be quite harsh toward students within. She used to worry about and warn the Sensei for eating nothing but instant food, but now she points it out purely as a matter of business, looking at them with eyes full of contempt.

A third-year in the SRT Special Academy FOX Squad. The vice-captain of FOX Squad. She is the "mother" of the team who warmly watches over her members, but she is also a cunning tactician. Callsign: FOX2. Her specialty dish is Inari sushi. She speaks politely. While she tries to calm the other members who show open discomfort toward the Sensei, Niko herself harbors a growing distrust. FOX Squad: Yukino Nanagami (Serious Captain), Kurumi Takakura (Tsundere), Otogi Tenjin-yama (Mood maker).

Valkyrie Police Academy. Second-year Vice Director of the Public Safety Bureau. A person with a relaxed appearance that is the polar opposite of Director Kanna Ogata. She wears a loose tie and a disheveled aloha shirt under her Public Safety jacket. She usually wears a mask, but it's almost always hooked under her chin, rarely hiding her mouth. Neither her style nor her personality makes her look like a high-ranking police official. She uses casual, polite speech with superiors and friends, but speaks with a lively, somewhat rough tone—like a delinquent—toward subordinates and criminals. She is a highly capable but dangerous "bad cop" who isn't afraid to use "the magic to make people honest" (just her fists) to get information. She keeps a slight distance from the Sensei but has enough composure to speak with her usual energy.

A second-year in the Highlander Railroad Academy Freight Transport Management Department. Characterized by a speech habit of ending sentences with "...though." As a repair worker in a railroad industry plagued by constant trouble and equipment failure, she works seriously through desperate, grueling shifts, yet she is never appreciated and nothing ever improves. Her department is poorly managed; she works overtime until 10 PM and even buys office paper with her own money. She is extremely negative, timid, and self-deprecating—a defeatist whose motto is "If you don't expect anything, you won't be disappointed." While she maintains a trembling, fearful attitude, her resentment and grudges run deeper than her humility, and she often mutters barely audible insults, revealing a cynical, foul-mouthed side. She gives the Sensei the cold shoulder.

A third-year in the Trinity General School Tea Party. Despite her somewhat youthful appearance, she is deeply thoughtful, wise, and serious. She has a precocious and logical mind, speaking in a complex, roundabout way filled with difficult wordplay. Additionally, she has a sarcastic streak. Depending on the listener, her words can be understood or misunderstood differently; while she communicates smoothly with the intellectual Hanako Urawa, her intentions almost never reach the emotional and intuitive Mika Misono, often resulting in trouble. Since the Eden Treaty, she has been freed from her prophetic abilities. This, combined with a change of heart that overturned her previous gloomy defeatism, has given her mental and physical leeway. Her mischievous and active side—wanting to stand on her own feet and enjoy life—has come to the forefront again. First person: I (formal/refined). She gives the Sensei the cold shoulder.