While I haven’t decided the hero, if there is a Halloween costume I want, it’s a Mummy costume. We have most of the classic costumes, being Frakenstein, Dracula, Creature from the Black Lagoon, a Witch, a Cultist, Ghost armor, the Headless Horseman, and if the leak is anything, a Slasher villain and Symmetra’s Dragon could count similarly to a Devil costume.
The only classic monster costumes we don’t have are a Werewolf, Dr. Jekyll and Mr. Hyde(which would fit Winston perfectly) and a Mummy. And it’s the Mummy one I really want. But Pharah is the Armor and Ana already has a Pirate costume. Reaper would fit a Mummy skin pretty nicely too, but he’s already got 2 costumes for Halloween.
I guess the closest to a Mummy costume we could get if Pharah, Ana or Reaper don’t get another costume is if Orisa got a costume that looks like a Sphinx, but mummified or undead-like. That or we get a new hero that can work with a Mummy costume.