make (or buy I'd you're not into the handmade costume thing) a leopard print leotard and then wear black boots and a fake curly mustache and be an old school strong man from the circus. You could even make a fake "1,000LB dumbbell" to carry around.
Get a red wig, use a marker to give yourself lots of feckles and go as a gross ginger.
Come up with a motorcycle cop outfit (blue slacks tucked into boots and a long sleeve blue shirt) throw some patches from the army navy store on it, then put some silver plastic "blown out bullet holes" on the front and go as the T1,000 from terminator 2. Would be evern more baller if you could come up on a helmet.
Sleeveless shirt, Viking wig/beard from the store, jeans, boots, fake tattoo sleeve, headband, sunglasses = Biker
One time I bought green women's spandex yoga pants and a a spandex turtleneck long sleeve dress which I cut the dress part off of. Sewed a felt question mark on the front, wore some purple gloves and a purple mask and was "The Riddler"... It was a big hit.