An underling of Fumiya&rsquo;s (and therefore a Kyokuto student), Yoshiaki is beaten when the Oni-Baku take Fumiya down. He appears in the next volume under the control of Okubo, and is a reluctant pawn because Okubo kidnaps his girlfriend Natsumi. He turns on Okubo and helps Onizuka by getting Ryuji and the Oni-Baku-gumi to come to his aid (he was already suffering a broken foot, which had him at something of a disadvantage against an entire gang of armed punks). He appears after these events with Natsumi, and they appear to have returned to life as normal, and is seen during the Midnight Angels conflict causing problems for the police with his gang.

(Source: Wikipedia)

Before Eikichi Onizuka would become the "greatest teacher in the world," he and Ryuji Danma were members of the infamous biker gang, Oni Baku. When they weren't out riding around and getting into trouble, this duo could be found in school. Doing what you ask? Picking up young women of course! 
(Source: Tokyopop)

Eikichi Onizuka and Ryuji Danma are members of infamous biker duo, the Oni Baku. When not out riding around, they can be found in school, trying to pick up young women. This is the story of the young Onizuka, who would later become the greatest teacher in Japan, and his partner Ryuji in their quest to lose their virginity and reach maturity. 
They are widely feared bosozoku, and are known for their tenacity and viciousness in a fight. However, this lifestyle does not exactly endear them to the opposite gender, so they decide to change their ways. However, this is easier said than done. 
(Source: Anime News Network)

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__Non-anime roles:__  Takeshi Yamato in "IZUMO2 学園狂想曲" (Visual Novel)  

Yoshiaki Asakura