Male. 52 years old. Homeroom teacher for Class 1-B at Seishin Academy. Teaches Japanese History. Although a former biker, 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. She values rationality and efficiency, maintaining a certain distance from students and colleagues. While her philosophy contrasts sharply with Onizuka's, working with the same class leads her to reconsider what it means to face students as a teacher.

Male. 16 years old. A student in Class 1-B at Seishin Academy. He has become a shut-in and keeps his distance from classmates. Upon learning of Kenta's situation, Onizuka takes action to bring him back to school. He is a key student who significantly influences 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 classroom where students generally avoid 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. She values her own principles 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 a crush on Kotone Wakatsuki but lacks the self-confidence to express his feelings. Seeing Ayumu's struggle, Onizuka decides to take action on his behalf.

Female. 16 years old. A student in Class 1-B at Seishin Academy. She is part of a class where all 28 students prioritize their own values and avoid meddling in others' business. With Onizuka becoming their teacher, the atmosphere of the class and the relationships between students begin to shift.

Female. 16 years old. A student in Class 1-B at Seishin Academy. She calmly assesses information and the evaluations of those around her, not opening her heart easily to teachers or classmates. She is skeptical of Onizuka's past and tries to test whether his words and actions can be trusted.

Female. 16 years old. A student in Class 1-B at Seishin Academy. She harbors troubles that she doesn't show to others. A certain incident leads Kashiwabara to confront Cocoa's issues. She is a pivotal character who gives Kashiwabara the chance to grow as a teacher while Onizuka is away.

Male. 16 years old. A student in Class 1-B at Seishin Academy. He dislikes being taught by anyone he considers less intelligent than himself and demands that Onizuka be replaced as homeroom teacher. He stands in opposition to Onizuka, questioning his very existence as a teacher.