God Hand/WMG

Gene learned how to kick ass from a practitioner of Hokuto Shinken
Specifically, it was Jagi. Respecting Gene's inner Jerkass, they developed a certain kinship and taught him how to fight like a cheating bastard. However, they had a falling out (IE Jagi tried to kill Gene for reminding him of Kenshiro) before Gene had an opportunity to learn the really deadly stuff.

The original user of the God Hands real name is "Alexander"
Yes, I know its a reference to a Mike Tyson quote, but it would work.