He is the ace striker and voice of reason of the team. His sister, Yuka is in a coma because of Kageyama's interference to stop him from playing against Teikoku Academy. He keeps an amulet made by his sister, and make a promise with her about stop playing soccer, but when he realizes his passion for the game, he changes that promise to become the champion of the Football Frontier.

His hissatsu techniques:
Season 1 - Fire Tornado, Inazuma Drop (with Kabeyama), Inazuma One (with Endou), Flame Weather Vane (with Kazemaru), Inazuma One Drop (with Endou and kabeyama), Inazuma Break (with Kidou and Endou), Emperor Penguin no.2 (with Ichinose and Kidou), Twin Boost F (with Kidou), Final Tornado (with Endou, Ichinose and Domon)

Season 2 - Fire Tornado Remastered, Bakunetsu Storm, Crossfire (with Fubuki), The Earth (with rest of the Raimon team)

Season 3 - Bakunetsu Screw, Tiger Storm (with Toramaru), Grand Fire (with Hiroto and Toramaru), True Bakenetsu Screw, Grand Fire Ignition (with Toramaru and Hiroto), Dragon Screw (with Someoka) and Jet Stream (with Endou and Toramaru)

Movie: Maximum Fire and Prime Legend (with Kidou)

Ares no Tenbin: Bakunetsu Storm (with Mukata brothers)

Orion no Kokuin: Last Resort

In the events of Inazuma eleven Go, Gouenji was revealed to be the antagonist of the new series because his status as the "Holy Emperor" of Fifth Sector, going under the alias of Ishido Shuuji. He was also Seidouzan's coach. However, It was revealed that he was a protagonist from the beginning.
(Source: Wikipedia, Inazuma Eleven Wikia)