Suggested by Destroyer It’s easy to forget this but Ken isn’t quite the super high tier fighter that you think he is. He’s definitely seen his share of defeats in the past and while he can be resourceful, he’s not stopping a dragon. Fin Fang Foom only needs one good fire blast and that would be the end of Ken. There just wouldn’t be a whole lot that he could do to defend himself. He would just be getting destroyed left and right the whole time. There is no way for him to dodge either. Fin Fang Foom wins.
Ken would need the ability to fly and the strength of 700 X 6000 men to defeat Fin Fang Foom, something his various incarnations lack.
Agreed, Ken just doesn’t have the sheer abilities needed to take down such a threat