The Castiels
There must be thirty different Castiels at this convention. Some of them even have wings. Huge black feathery wings. Little black feathery wings. A couple of the Castiels can even flap their wings, which produces a lovely breeze, in case one is feeling warm. And of course there are trench coats galore.
There are only handful of Crowleys, which is surprising since everyone loves that character.