Male. 52 years old. Homeroom teacher for Class 1-B at Seishin Academy. Teaches Japanese History. Although a former biker gang leader, his speech is relatively normal. His passion for facing students head-on remains unchanged. He uses unconventional methods to tackle the problems of students in a modern, tablet-centric school environment.

Female. 24 years old. Assistant homeroom teacher for Class 1-B at Seishin Academy. Teaches Classics. An excellent teacher who is rational, efficient, and handles her work flawlessly, but she keeps a distance from students and colleagues to avoid trouble. She lacks any particular passion for teaching or her students.

Male. Early 30s. A former student of Onizuka's, now a staff member involved in the management of Seishin Academy. Having experienced Onizuka's unconventional guidance during his own student days, he understands Onizuka's true nature better than anyone. He was the one who initiated bringing Onizuka back to the school.

Female. Late 30s. English teacher at Seishin Academy. She has a bright, friendly personality and is skilled at closing the distance with students by incorporating game-like elements into her lessons. While highly rated by students, she is also very conscious of her professional evaluation and career.

Male. Early 30s. Mathematics teacher at Seishin Academy. One of the teachers who conducts classes strictly according to the school's educational policies. He faces the school and students from a different standpoint than Onizuka, supporting the modern educational front.

Male. 16 years old. A student in Class 1-B at Seishin Academy. He has stopped attending school and keeps his distance from his classmates. Upon learning of Kenta's situation, Onizuka begins to take action to bring him back to school. A key student who significantly impacts Onizuka's approach as a teacher from the start of the story.

Female. 16 years old. A student in Class 1-B at Seishin Academy. She interacts with Onizuka as a member of the class. In a class where everyone generally avoids interfering with one another, she begins to change little by little due to Onizuka's unconventional actions.

Female. 16 years old. A student in Class 1-B at Seishin Academy. A member of the class who values her own views and avoids unnecessary interference with others. Ayumu Yoshida has feelings for her, and Onizuka ends up getting involved in their relationship.

Male. 16 years old. A student in Class 1-B at Seishin Academy. He has feelings for Kotone Wakatsuki but lacks confidence and struggles to express his emotions. Seeing Ayumu like this, Onizuka decides to take action for his sake.

Female. 16 years old. A student in Class 1-B at Seishin Academy. One of the 28 students who prioritize their own values and avoid interfering with others more than necessary. With Onizuka becoming the homeroom teacher, changes begin to emerge in the classroom atmosphere and the relationships between students.