Jun Kamata (鎌田純 Kamata Jun)
GTO: The Early Years (Shonan Junai Gumi)[]
Kamata first appeared as a bad guy with his buddy Saejima, but when the Oni-Baku beat them they changed their ways.
Kamata is shown to be incredibly strong, beating whole gangs when he's in a bad mood. He has a younger sibling, Kaoru, who causes all sorts of misunderstandings.
Kamata has a painful history- he spent his childhood with his best friend Natsu and his older sister, but her rape at the hands of a vicious gang caused her to commit suicide. Natsu then killed the perpetrators, but Jun had arrived with some adults who took him away, shouting 'Traitor!' at his former friend. Jun leaves Shonan for the United States, honoring a promise he made, but makes an appearance in the final volume working in a bar. Kamata rides a Honda Steed.
Ino-Head Gargoyle[]
He comes back to Japan in Ino-Head Gargoyle taking the role of a junior officer (under the name Junichi Katsumata) to avenge what drug dealers did to his little brother. He is helped by Saejima, Nakajo and Akutsu.
A female member of the Blue Rose gang lures him to an abandoned building, where the rest of the gang ambushes him and forces him to ingest Blue Rose with alcohol, which causes suicide-inducing hallucinations. Saejima and Okita arrive just in time to save him, but Saejima has to jump off the roof after him.