Mine would be the time my dad rigged a harness and “hung” himself from the carport beam, dressed to look like a stuffed Halloween decoration. He would grab at the bigger kids and parents when they came up to the door for candy. Scared the living bejeezus out of them.
If anything, I spent spooky season cosplaying, nothing spectacular. Was never really a trick-or-treater unless it was a part of something else. My favorite cosplay was of Arezu. That day, everyone wanted me to trick-or-treat.
I remember having lots of Pickachus, a few Ashes, maybe a Naruto or two. One year I was visited by a Totoro, but otherwise nothing very niche. Did any adults recognize your character?