Wait, how does Ice/Fire make sense? You're immune to a power while using it, that's obvious. But how does being immune to everything but the ambient version of a power that damn near every setting agrees should be strong against you work?

This breach of "normalcy" isn't going to help anyone. You won't get to RP out being challenged by anything, people won't get to RP out challenging you, and you'll just kinda *be there* in fights, since there's no reason for the enemies to attack you.