Shizuma Kusanagi

A year ago, this young, tough ruffian was the K-Fight champion until Ryouko beat him. He has now returned for a rematch.

He is a street brawler who practices kamui: a method that gives him fire-ki abilities. Besides his strength and use of flames, he had no real martial arts training but simply uses methods from his years of experience in street fighting with this combination of his own personal style and fists of kamui, which he christens it Hono no Tora ("Tiger of Flame"). This makes him one of the strongest martial artist in the school.

Unlike Ryouko, he is not a member of any school club. So, in the manga, he created his own fan club. Although very cruel at times, he shows a soft spot towards Miyuki (the Hiten Shrine girl and Tessai's grand daughter), Sara (his personal fan), and sometimes even towards Ryouko,

Due to his family musical background, he has skill with the guitar and piano. In his childhood, he was taught kamui by an old homeless looking man named Ryugan Higishikata for everyday use. Shizuma turned it into a fighting technique.

He owns a Motorcycle. He was obviously modelled after Kyo Kusanagi and has his last name. In the manga, he is modeled after Donnie Yen as you can see in vol 6 of the manga he had Nunchakus in his final fight with Ryoko.

(Source: Wikipedia, edited)