All you need is a blond hair, a stake, and and outfit straight out of the mid nineties.
Most comfortable costume ever! Wear pajamas and the all important robe, and don't forget a towel. Bonus points to those find a small yellow fish to stick in their ear.
Find a blue suit and a red tie, carry around a bag of Reese's Pieces and continually proclaim. "Oh piece of candy."
No you're not cool enough to be Superman, but find your self some thick rimmed glasses and a super nerdy beige suit and you could be his alter ego. For those of you who just can't stand it, put a Superman T-shirt under the suit and every time someone takes a picture you can epicly rip it open.
Red hair, slight cat eye makeup and carry around something Spiderman related. Also it would be pretty easy to find an outfit that was directly from the pages of a comic.
Dark hair, black clothing, only very basic makeup (no eyeliner for Liz people). Buy blue cellophane and crumple a piece into a fire-like ball to hold in your hand for pictures. To be extra cool cut up pieces of cellophane into fire like shapes and glue them to your skin using spirit gum.