|First Appearance(Manga)||Koukou Tekkenden Tough Chapter 143:|
Gosaka was Iron Kiba’s trainer hired by his fathers widow who sadistically beat him on her behalf.
Gosaka initiated Kiba to all sorts of combat styles after he was adopted by Rikiyama’s wife.
Kiba later snuck into his bedroom as night while he was asleep and attacked him with a bat. After Gosaka lost consciousness Kiba put him in a elbow lock breaking his arm. That night Gosaka became Kiba’s guinea pig to test all of the techniques he learned on.