I've been wanting to play a DBZ character who's of Bojack's race (a Hera) who has different 'transformations' if you want to call them that. These transformations give him varying degrees of different specialties but not like a super saiyan. For example one form he forces all of his allotted power into Ki drastically increasing his ki abilities. But makes his physical strength and speed suffer as a result. In exchange his ki blasts are monstrous. Another version that's the opposite where he goes full on power horse but lacks the ability to channel ki into bigger blasts. I can turn him down to a lower power level for a roleplay like this and start him at base form.
So basically he has a stat allocation of 30 and just shifts those points around. So its an actual transformation and not a powerup.
I know I've gotta get a Majin balanced for all this but I think the best way would be to make them get tired fast if they gotta keep regenerating. Something that makes it like the games.