Spider-Man.

There was like 4 of them bouncing around on Sunday, but I'm pretty sure this guy was the only one on Saturday. A lot of people in costume would just pose like they were taking a family portrait, so often I would have to tell them to act like a superhero before I took their photo.

I've never seen anyone wear the black-and-white costume (symbiote) of Spider-Man, I'm sure that would be a huge hit at any convention.