If you're going to a con, any con, in-costume, people WILL take pictures of you. Sure, lots will ask first and want to be in it with you, but a lot will also just walk up and take pictures without saying anything and they're 100% allowed to.
Hell, it's happened to me a bunch of times back when I went to cons in-costume. (Though luckily it was just because people liked my armors and not because I'm a notorious furfag that wants to fuck animals and smells like shit such as this individual).
I can't imagine how retarded you'd need to be to show up, as an already well-known freak, in a public space like this, in the exact same outfit that people already associate with you. That's some Kero the Wolf level stupid.