Misao Onizuka

, also known as, is a senior at Ishiyama High School. He is a former member of the Tōhōshinki before his position was apparently replaced by Tatsuya Himekawa. After serving time in juvenile detention, he joins the Poltergeists, where he is currently known to be the pianist.

Appearance
Onizuka is an extremely tall and muscular man who towers over several delinquents. He has dark, shoulder-length hair styled into tied-up dreadlocks and slanted eyes. He has a thin mustache growing into two different parts over his upper lip. He also has a large, cross-shaped scar on the right side of his face that stretches across his rather wide nose.

He wears a dark-colored shirt underneath an open jacket with a chin-length collar. His jacket is light-colored except for a large patch of cloth that stretches across the sleeves. His pants and shoes are of a similar lightness. The former particularly has the same path of cloth stretching down the pants' sleeves. Moreover, around Onizuka's neck is a large chain-like necklace with a squared pendant.

Personality
Initially displayed as a calm individual, Onizuka is actually rather merciless and prone to anger, especially when confronted with former acquaintances such as Shintarō Natsume. Moreover, he is rather arrogant and conceited. Though once regarded as a member of the Tōhōshinki, he now holds those carrying the title with disdain, believing that they, as well as other notable delinquents in Ishiyama, have become much weaker since moving to Saint Ishiyama.

History
Throughout Onizuka's high school years in Ishiyama, he was regarded as one of the Tōhōshinki; moreover, he often clashed with fellow member, Hidetora Tōjō. However, at some point, he was sent to a juvenile detention and subsequently stripped of his status as one of the Tōhōshinki. He was eventually released from the juvenile detention after some time. Later on, Onizuka came to meet Yōhei Nasu, having since served as the freshman's own underling.

Return to Ishiyama High School Arc
In an encounter with Hajime Kanzaki, Nasu takes him on in a fight, easily taking him down. The sight of the defeated Tōhōshinki prompts Shiroyama to rush to his leader's side; however, before he can proceed any further, he is unexpectedly stopped by Onizuka.

Onizuka requests to fight Shiroyama and is given permission by Nasu. He then turns to Shiroyama and begins taunting the Tōhōshinki's strength following their arrival at Saint Ishiyama Academy. Onizuka's comments consequently result in him receiving a punch though he then returns with a powerful roundhouse kick to Shiroyama's leg, knocking the large individual against a wall. Onizuka then adds that he and the other Saint Ishiyama transfers have become very weak. As he says that, Natsume quietly puts a hand on Onizuka's shoulder, drawing his attention. Onizuka flares at the sight of Natsume and proceeds to punch him when he refuses to speak back. Surprisingly, Natsume grabs Onizuka's fist, then crushes it and forces the larger teenager on his knees. Onizuka wonders whether Natsume is really on the same level as Tōjō.

While Onizuka is still dazed on the ground, he notices Oga arriving in the hallways, though he remains on the sidelines in the subsequent events. It is long until all of the other Poltergeists arrive to pick up Nasu; when they do, all of them, including Onizuka, leave the vicinity.

The following day, Onizuka practices playing the piano in one of Ishiyama's classrooms.

He later regroups with the other Poltergeists in a separate classroom where they are visited by Hajime Kanzaki and Takayuki Furuichi. Onizuka watches as his fellow Poltergeists beat up the Tōhōshinki with relative ease. As he looks on at the seemingly defeated delinquent, an unusual horn-like tattoo appears over Onizuka's forearm, with a number 1 imprinted near it.

Powers & Abilities
Hand-to-Hand Combatant: Onizuka is a considerably strong delinquent, having been a former Tōhōshinki known to have fought on par with the powerful Hidetora Tōjō, who is currently regarded as the strongest of the group; furthermore, this constant back-and-forth fighting has been ongoing during a period of three years. Onizuka's techniques appear to revolve around simple kicks which are strong enough to knock over a large man such as Shiroyama.

Yōhei Nasu
Despite Onizuka being an older student, who apparently has never served as another's underling, he shows a considerable amount of respect for the freshman Nasu, even asking permission to fight someone whom he is unacquainted with.

Hidetora Tōjō
It was mentioned that Onizuka used to fight with Tōjō throughout his high school years.

Shintarō Natsume
Onizuka particularly finds Natsume to be the most annoying of their "little group". He treats the fellow student with hostility due t to the fact that he has always found Natsume's personality to be irritating: cheerful, composed, yet seemingly confident enough to hold his ground. However, upon being forced to grovel at Natsume's feet, he became astonished that Natsume could have such power, something he compares to being on the same level as Tōjō's.

Quotes

 * (To Takeshi Shiroyama): "You guys... have gotten pretty weak. The rumors are floating all over the place. Ever since the Tōhōshinki went to Saint, their fangs have been all dull. You guys all played nice together, right?"