Sixknight

Sixknight is dedicated to being the best. A member of the enigmatic ninja Six Clan, he has voyaged across the universe increasing his strength and skill, mastering the elusive art of six-changing and learning to manipulate Tenchōkon Power. The problem with this boastful ninja, though, is that he really needs people to know how good he is, and if there's someone out there who claims to be more powerful, then there's no other course of action for Sixknight than to take them on and show them who's boss. Sixknight really only understands force, believing that one's own power is all that matters—the subtleties of fighting for something or someone are lost upon him. As a Six Changer, however, he is a mercurial, impressionable sort, and the nobility of the Autobots intrigues this wandering warrior...

(Source: TF Wiki)