Well I seem to be taking a liking to this guy, mainly because he is a goat in a suit with an energy sword. Just think about that for a while. Not even sure what he's from, or what he does. Anyway who's the strongest character he can beat?
I wasn't trying to lowball. Seiya has universal+ characters. But maybe he could take out characters even stronger than them. Those are just the strongest anime characters I know that could lose. Only anime characters I know in decent detail above them are Tenchi Muyo characters which would destroy the Single Theory Goat.