- 1 Appearances
- 1.1 Downtown Nekketsu Monogatari
- 1.2 Downtown Special: Kunio-kun no Jidaigeki da yo Zen'in Shūgō!
- 1.3 Kunio-kun no Dodgeball da yo Zen'in Shūgō
- 1.4 Downtown Nekketsu Baseball Monogatari: Yakyū de Shōbu da! Kunio-kun
- 1.5 Downtown Nekketsu Monogatari EX
- 1.6 River City Super Sports Challenge ~All Stars Special~
- 1.7 Downtown Nekketsu Jidaigeki
- 1.8 River City: Rival Showdown
- 1.9 River City Melee: Battle Royal Special
- 1.10 River City Ransom: Underground
- 1.11 River City Girls
- 1.12 River City Melee Mach!!
- 2 Trivia
- 3 Gallery
Onizuka's debut game, he is the first boss found inside of Reihō Academy.
In River City Ransom and Street Gangs, Onizuka is renamed Otis.
Onizuka has this strange aura about him that reeks of evil, but in truth he and his scary face hides a gentle and genuinely caring personality. He takes great pride in keeping with sports conduct and berates at anyone who forgets to take off the shoes before entering the gym.
Onizuka makes an appearance in this game, this time as a clerk for Pay Lots, a convenience store located in Downtown. True to his description; he has an imposing look, but he speaks in a gentle, monotonic voice.
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