I really feel like this is two hands, … that are somehow missing clapping.
the powers in the game have a set ability, with some customization.
the costume AND THE BACKSTORY tell how the character became what they are, got their powers, and perhaps influenced their philosophy.
it seems like you want the costume/powers to be all one thing and do the heavy lifting. Like stone, this becomes a very defining everything about the character with zero room for anything besides “hi, i am mr rock 23456.”