Spoiler
Full Frontal was originally a man named Deux Urithra. He was one of the Axis refugees after the end of the OYW and later served in both Neo Zeon rebellions, piloting various Zeon mobile suits (from the Gaza-C to the Bawoo to the Geara Doga in CCA). He was an excellent pilot but he never stood out. After Char's Counterattack, he was approached by a Zeonic scientist who had recovered the Sazabi's cockpit. Because Deux had a very similar bodytype and matching hair color to Char (and because he was believed to have untapped Newtype potential) he was given the chance to become the 'new vessel for Char'. Deux took up the offer and became the man we know now as Full Frontal. His first order of business was the theft of the Sinanju prototype. With only a squad of Geara Dogas (led by himself, with future ace Angelo Sauper among his team) they took the Sinanju after a hard fought mobile suit battle. FF's Geara Doga was destroyed, but his powers were tapped: he was Char now, in all but name.