If you had the ability to change one aspect of any one hero to make them better in your eyes, what would it be?
Keep in mind giving them extra powers wouldn't necessarily make them better, because then their books would get stale. If Batman had superspeed, his villains would all be locked up in under a week. If Wolverine could teleport, no one could possibly oppose him. It wouldn't make the comic or the character better.
My choice is Shazam. I really like Shazam, I love that he can go toe to toe with Superman, but the fact that he's a preteen just bugs the hell out of me. All I'm asking is finally make Billy Batson grow up a little. Get him into his late teens, or even his twenties. Knowing that Black Adam is really just beating up some child takes the gravitas out of the situation.