I would have to say Giorno Giovanna from jo jo's bizzare adventures. He has something called the Gold Experience requime which negates any attack or power to have 0 effect. It's one of the most broken weapons ever!
Is this excluding Tenchi Muyo? If so i would say Darshe in his majin form. He has so many feats it's incredible! I know he's probably not the strongest but he is my favourite anime character besides Goku XD