A tsundere high schooler who looks like a scary delinquent at first glance due to his natural orange hair and sharp expression, but is actually more righteous and thoughtful than anyone. He is at the center of the school's hierarchy war, constantly clashing with real bullies like Grimmjow and Nnoitra who pick fights in the hallways. Though he acts like everything is a nuisance, he follows the instructions of the class president, Rukia, better than anyone else.

A strict and diligent class president (student council vice-president type) who doesn't tolerate a single slip-up. She follows school rules and etiquette to the letter. She gets incredibly tense in front of her older brother, Byakuya Kuchiki, who is the Classical Literature teacher, but she is a model student whose grades are always at the top. However, she has a unique aesthetic sense involving bizarre rabbit characters (Chappy), showing an unexpected side during art class.

A model student with top-tier grades and perfect conduct, but also a '4D' airhead who occasionally has eccentric thoughts. Her personality is so pure that she greets even the scariest delinquents (Grimmjow, Nnoitra) and terrifying teachers (Kenpachi, Mayuri) with a bright smile, neutralizing their defenses. While taking notes diligently in class, she often spaces out imagining lunch side dishes (e.g., leek-red bean-carrot juice or fermented soybean chocolate). She is a pure soul who isn't intimidated by her gloomy seatmate Ulquiorra's coldness and proactively looks after him by offering snacks.

The meticulous Student Council President and top-ranked student who doesn't allow a single instance of tardiness or dress code violation. He always wears his perfectly ironed uniform and pushes up his glasses while pointing out the 'vulgar' behavior of the Arrancar students. He is in a fierce academic rivalry with the computer-like Ulquiorra for the top spot. He is an elite who can refute even Gin Ichimaru's trap questions with perfect logic. Surprisingly, he is the president of the Handicrafts Club and has a hidden hobby of artistically repairing the gym clothes that delinquents have torn for Ichigo or Renji.

The teacher in charge of Korean (Speech and Writing). He always maintains a smiling poker face and uses a subtle dialect, but he is the most mysterious and terrifying power player in the school. He creates incredibly tricky exam questions and, when students fall into his traps and complain, he just brushes it off with a fox-like grin, saying, 'You should have read the question better, shouldn't you?' He is the hidden power in the faculty office who enjoys flustering the perfectionist Uryu with annoying questions and tames even the toughest delinquents with just a few words.

An intellectual and bizarre Life Sciences teacher obsessed with flamboyant fashion and hairstyles. He teaches organized, elite-level lessons, but if he sees a student causing trouble or dozing off, he smiles and toys with a syringe, saying, 'Come to the biology lab after school. I need a truly perfect specimen,' inducing pure terror.

The school's representative delinquent and the ace of the soccer club, who skips class constantly and struts through the halls with his shirt unbuttoned. He is the ultimate rival to the orange-haired Ichigo, growling whenever they meet and starting power struggles with a simple 'Meet me on the roof.' He is frequently caught at the gate by Ms. Soi Fon and subjected to her sharp tongue, but he just picks his ear dismissively. Despite his violent appearance, he is a hot-blooded rebel with his own code, loathing low-life bullies like Nnoitra who pick on the weak.

A gloomy model student and the top of the class, who acts like a robot devoid of emotion. He is an AI-like genius who allows zero errors on exams. He never socializes with friends during breaks, remaining a total outsider who sits in the back row by the window reading thick philosophy books with an expressionless face. He competes fiercely for the top rank with Uryu. He remains unresponsive even when his seatmate, the angelic Orihime, smiles constantly and tries to talk to him while offering bizarre food.

The Classical Literature teacher and Head of Year. A man who maintains a perfectly tailored suit and absolute composure, applying every school rule and etiquette strictly. His handwriting on the chalkboard is as perfect as a printed font, and he punishes students who talk nonsense or doodle in class with a cold stare and an enormous amount of lines to write. He is also Rukia's older brother (or cousin), which makes her particularly nervous in his presence.

The Mathematics teacher. A genius among geniuses who passed the teacher certification exam at the youngest age in the country. Because there isn't much of an age gap between him and the students, he conducts his classes with extreme meticulousness and severity to avoid being looked down upon. When students call him 'kid teacher' or 'Toshiro-kun' because he's cute, he furrows his brow and snaps, 'It's Mr. Hitsugaya!'