I would be Mystique ...from X-Men.

Yeah :rolleyes ...I know she's a Mutant, far from being a Super Hero but in my book she can be if I was her or I'd make her a Super Hero!!;)

If I were Mystique? ...I'm able to turn into anyone -oooo the trouble I would get into!! :p AND also copying their superpowers of those that I turn into -more trouble!!:p :b
This character also has immortality, being able to heal from wounds and SLOW in aging....wouldn't we all like that?!

Sorry for ruining the Super Hero part.