Just a few websites that can make the creating of superheroes quick and easy.
Note: These will help you visualize and conceptualize your hero/heroine, from there your powers may have to be changed for gameplay purposes.
http://marvel.com/games/play/31/create_your_own_superhero (http://marvel.com/games/play/31/create_your_own_superhero)
Marvels own hero creation site :)
http://www.heromachine.com (http://www.heromachine.com)
A great site for making super heroes, I recommend using Hero Machine 3 :)
http://cpbherofactory.com/ (http://cpbherofactory.com/)
Another cool site for making super heroes :)
Can't think of a name? Try
http://www.seventhsanctum.com/index-char.php (http://www.seventhsanctum.com/index-char.php)
Pretty Cool Name and Power generator
http://home.hiwaay.net/~lkseitz/comics/herogen/ (http://home.hiwaay.net/~lkseitz/comics/herogen/)