[quote=Mr Allen J]Depends on the details, I will accept a power nullifier as long as it's reasonable. But I have to ask how would people with physical mutations as drastic as Henry's work with the power?
[/quote]

That's the limitations of the nullification. It doesn't affect physical mutations that has already occurred.

I was thinking of having the trigger be eyesight - limited only to when the character looks at the target.

Though, it might be a very boring power in a sense D;