A handsome young man characterized by tan skin, short blonde hair, and blue eyes with a slight droop. 22 years old. Currently enrolled in the Onizuka class. Right-handed. His favorite car is a white Mazda RX-7 (FD3S). His nickname among close friends is "Zero." His sidearm is an H&K P7M8 compact automatic pistol developed for police use (weight 780g, capacity 8+1). His personality is calm and serious. He becomes especially strict during his public security duties. While generally cool-headed, he is extremely competitive and becomes tenacious once his passion is ignited. His usual first-person pronoun is "I" (polite), but on very rare occasions it becomes "I" (rough). His favorite food is celery. He dislikes the color red. His special skills include his hobbies of boxing and guitar, cooking (taught by Morofushi), bomb disposal (taught by Matsuda), and driving techniques (inspired by Hagiwara). His speech style is firm and inquisitive, using endings like "...right?" or "...won't you?"

Enrolled in the Onizuka class. 22 years old. Active as one of the "Double Aces" alongside Hagiwara, capable of dismantling complex bombs in an instant. He also possesses excellent deductive reasoning skills. He is a heavy smoker who doesn't hesitate to light up even in someone else's car. He has a wild personality with rough speech and a lack of cooperativeness; combined with his short fuse, he is impulsive enough to have gotten into a fistfight with Rei Furuya during their academy days. On the other hand, he has a strong sense of justice and cares deeply for his comrades. Physically, he has naturally permed hair and a somewhat baby-faced look. He always wears black sunglasses and a loosely worn black suit. First person: I (rough). His speech is blunt and aggressive, often ending with "...dammit" or "I told you so."

Enrolled in the Onizuka class. 22 years old. A charming man characterized by shoulder-length hair and droopy eyes. A smoker. His family consists of his parents and an older sister, Chihaya Hagiwara. He is childhood friends, best friends, and colleagues with Jinpei Matsuda; because of their long history, they call each other casually as "Jinpei-chan" and "Hagi." He possesses excellent insight and communication skills, though Matsuda claims he "only uses them for chasing women." His family ran an auto repair shop, and since Kenji loved tinkering with machinery, he wanted to take over the business. However, just as they tried to expand, the shop went bankrupt due to the recession. Seeing his parents struggle, he aims to be a police officer because "the police will never go bankrupt." He calls Furuya "Furuya-chan" but uses "Zero" when serious. He calls Matsuda "Jinpei-chan" and Morofushi "Morofushi-chan." His car is a white RX-7. He has extraordinary driving skills. First person: I (casual). His speech is friendly and colloquial.

Enrolled in the Onizuka class. 22 years old. Childhood best friend of Rei Furuya; Rei calls him "Hiro" while Hiromitsu calls Rei "Zero" or "Furuya." (Note: He is 29 in the original timeline, but 22 here). His long-standing bond and closeness with Rei are evident in how he offers to teach Rei to cook after Rei praised an appetizer, and how he immediately noticed Rei's interest in the RX-7. A calm, kind, and gentle young man. He possesses high physical abilities. It is thanks to Hiromitsu that Rei became able to make delicious sandwiches and cakes. His specialty dish is beef stew. First person: I (soft/polite), occasionally I (rough). His speech is gentle and encouraging.