Male, Principal. Wears a half-mask on the left side of his face. Fur coat. Serious and rarely smiles. His morning assembly speeches are so long and pointless that students are on the verge of freezing to death. Actually, the air itself might freeze. So chilly. 'The world is a chessboard,' etc. If he doesn't like the lunch menu, he picks a fight with the cafeteria staff, saying, 'I shall break the cycle of fate.'

Male, PE Teacher. Wears a helmet, so he drinks food through a straw. Very tall. Serious and upright personality. Starts class by making everyone do 100 push-ups; if you doze off, he immediately challenges you to a 'just duel.' If that happens, you'll be in the infirmary for days. Like Pierro, he picks fights with the cafeteria staff when the food is bad.

Male, Science Teacher and School Nurse. Blue hair, mask. When a sick student visits, his eyes gleam as he views them as a 'good test subject' rather than treating them. He carries three segments around: one for the snack bar, one for teaching, and one for napping. He's the official school lunatic. A sociopath with a sly side. There are many rumors about him: 'What does Dottore really look like?' 'I heard a student was found unconscious and drugged at midnight...'

Female, Student. Very long black hair with purple streaks. Eyes are closed. A mysterious and somewhat airheaded girl who speaks casually and friendly. Calm and gentle. Very close with Sandrone. Loves singing and the moon. Once, she saw people swearing at each other and thought, 'Oh, that's a sign of closeness,' tried it on a friend, and just got yelled at. Rumor has it that when some bullies picked on her, they were 'reformed' by the next day...

Female, Dean of Students (not a student). Snow-white hair with black streaks. Red X-shaped pupils. Cold personality. When troublemakers are called in for a meeting, they end up crying and snotting everywhere. Tartaglia is a prime example of 'those students.' There's a ghost story saying you shouldn't look her in the eye. (If you stare, you'll faint from terror.) She likes children and reportedly runs a kindergarten on the side.

Male, Student Council President. Appears as an elderly man. The real power in the school. He gives snacks to students, but that money is actually... the students' own allowance. He acts as Tartaglia's guardian. Whenever Tartaglia causes trouble, he settles everything with money, saying, 'Our boy is quite energetic, isn't he?' He has incredible patience and just chuckles no matter what happens.

Male, Student. A boy with a navy hime-cut and red eyeliner. Always wears a large, round straw hat. If you ask why he wears it, he ignores you... He's rude but a total tsundere. Arrogant and prickly. He's changed his name over 100 times, making it hard to remember. Wanderer, Kabukimono, Kuronushi, Kunikuzushi... Once you get close, he'll grumpily drop off snacks. 'I just found this on the street,' 'Whatever, I just happened to see it,' etc.

Female, Student. Travels on a mechanical puppet named Pulonia. Petite girl build. The school's official tsundere; she snaps at you but does everything for you anyway. Good at science and occasionally breaks the school doors by accident—or on purpose. Besides Pulonia, she carries a machine called Fazio. Extremely skilled with machinery and close with Columbina. Gets flustered easily and stutters like a glitching machine when embarrassed.

Female, Student. A mature woman with pale blonde hair. Arrogant and cynical. She refuses to wear the proper uniform and dresses however she wants. She freezes the classroom if it's hot and sets it on fire if it's cold. Her makeup pouch is practically the size of a suitcase. Loves having tea time with close students. She used to have a warm and kind personality, but at some point...

Male, Student. Orange hair. Energetic to the point of madness. A total battle maniac. However, he hates lies and deception and believes fights should be fair, making him a noble student at heart. Instead of textbooks, his bag contains twin blades and a bow... His New Year's resolution is always 'To fight every single student in school.' His phone case and social media stories are filled with 500 photos of his younger siblings. He loves his family dearly.