Takeshi Shiroyama

Takeshi Shiroyama (or Shiro-chan, as Natsume nicknames him) is Kanzaki's most devoted underling. A strong, tall third-year, he is nevertheless easily defeated by Oga with a single shot to the chin.

Even after his humiliation by Kanzaki and the dissolution of the latter's gang, he remains attached to Kanzaki. Later, when he is sent to the hospital by St. Ishiyama students, Kanzaki visits upon him. He escapes the hospital to support Ishiyama against Rokkisei in the volleyball match, but is taken back by the staff. He is often seen acting as Kanzaki's voice of reason.

Appearance
With light tanned skin and dark eyes, Shiro stands out due to his height and large well-muscled physique. His hair is braided into pigtails tied by yellow bows. Shiro also has two scars on his left cheek, similar to Miki's. He is often seen wearing a school uniform.

Saint Ishiyama Academy Arc
Shiroyama along with the rest of the Ishiyama gang is transferred into a special class due to their delinquent status. One day, it is revealed he has gone missing along with Kanzaki. Yuka Hanazawa and Ryōko Asuka explain in their flashback what happened: The two girls were having lunch together until three Saint Ishiyama students Nakadai, Mori and Sumida interrupt their lunch to seemingly harrass them. Shiroyama then appears and tells them to back off and tells the girls to go eat somewhere else.

The three students yell at him for ruining their chance at gaining an "honest love" and reveal they were actually trying to flirt. Shiroyama is taken aback and offers the three students a free punch at his expense. Mori punches him in the stomach and much to his shock, Shiroyama is unfazed and his fist now hurts. A heavy weight barbell then comes out of nowhere and strikes Shiroyama in the head, making him stumble. Nakadai notices this and helps Sumida carry an even heavier weight. Shiroyama stands at the ready to take the impact and to fulfill his offer to the three students. The three then toss the weight on Shiroyama and he is struck off screen.

Hanazawa and Asuka claim they saw him fall unconscious and called the ambulance as soon as they could. After lunch, they informed the whole Ishiyama class of Shiroyama's state, the news makes Kanzaki storm out of the classroom in an enraged state seeking revenge on the three students.

During the volleybal match between the Rokkisei and the Ishiyama gang, he escapes the hospital to support them, but is taken back by the staff due to the chronic bleeding that he still has.

Prince En Arc
While searching for En online, he is part of a team FPS game, and partners with Shintaro.

Abilities
Due to his large size, Shiroyama is quite strong and durable and has good fighting skill, however he is nowhere near as strong as Oga or even Kanzaki. A testament to his endurance was when he took a massive barbell to the head and survived, even after being hospitalized he manage to get back on his feet and go all the way back to school to cheer Kanzaki on during the volley ball match between Ishiyama and the Rokkisei, although he did still suffer from his injuries. During Zenjūrō Saotome's training of some of the Ishiyama delinquents, Shiroyama is shown to now be able to fight on par with Tatsuya Himekawa (who has also been partaking in the same training).

Hajime Kanzaki
They are still friends, but Shiro is beginning to stand up for himself more.

Shintarō Natsume
Natsume treats Shiro more fairly, and after everyone finds out he's actually way stronger than the lower-tier guys like Kanzaki (just hiding his power) Kanzaki seems like a less intimidating boss by comparison.

Quotes

 * "Dondongo! Dodongo!" - While taking the outfit of a Dodongo during The Men's Turn...?.