let me tell you, if you find them please advise! Superhero stuff is SO HARD to find in the digi scrapping world! And I can't figure out why, don't boys & girls usually love Superhero's ?!
I did find a kit by Faith True & MLE Card with generic superhero's in it, but I'm unsure if they can be used for what you want them for... sorry I can't be of more help!