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This wiki explores the manga series as well as the animated and live-action adaptions of Great Teacher Onizuka and its affiliated works. Please feel free to contribute!
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Great Teacher Onizuka (GTO) revolves around an eccentric, yet mischievous teacher who is not afraid of brazenly admitting to being a pervert. At 22-years-old, Eikichi Onizuka represents everything that contradicts and challenges the foundations of the educational system. His methods are considered bizarre and often dangerous. Despite this, Onizuka manages to earn his students' trust and respect one-by-one while simultaneously teaching them life lessons.

Bad Company is a single-volume prequel to GTO's predecessor, Shonan Junai Gumi. It depicts Eikichi Onizuka's life prior to his joining of the Oni-Baku. The manga was published in 1997 by Kodansha while Tohru Fujisawa was still working on GTO.

Shonan Junai Gumi (English: Shonan Pure Love Gang) is a 31-volume prequel to GTO. It depicts Eikichi Onizuka and Ryuji Danma as teenagers in the infamous Oni-Baku bōsōzoku gang. The shōnen manga was originally published between March 1990 and September 1996 in 31 volumes. In 2009, it was retitled GTO: The Early Years for the English digital deluxe release.

Ino-Head Gargoyle is a five-volume spin-off of GTO. It depicts Toshiyuki Saejima as the guardian of an ex-high-class escort named Arimori Shizuka. The manga was published between January 2012 and January 2014.

GT-R: Great Transporter Ryuji is a single-volume spin-off of GTO. It depicts Ryuji Danma and a girl named Mimon Ishikawa and their misadventures. The manga was published between June 2012 and October 2012.