This character keeps showing up in my dreams trick-or-treating. She doesn't say much and usually has a bunch of straps on her straight-jacket shrug, but I wanted to let her roam free today. No name yet and her costume changes a little with every dream. This is the base design though.
Anyway, what she does is exactly how it's described: plays pranks (usually ending in a gruesome death of her victims), get treats and leaves happily, or gives treats (rarely). She speaks very little and doesn't smile much...unless you give her candy.
I remember one dream a little boy in a Jack-o-lantern mask walks up to her and gives her a skull lolipop. He then asks her to help him cross the street because his big brother ran off without him. She grins from ear to ear and happily agrees, pretty much dragging him across the street. When they reach the other side, he politely thanks her. She bends down to his level and opens her sack. "Trick or treat. Reach inside." His little hand reaches in the bag and pulls out a GIGANTIC pumpkin shaped lolipop. It's so big he loses his balance a little while beholding it's sugary glory. When he looks back up to her, she's gone. He says in a little voice, "Happy Halloween..."
This is one of the few times something nice comes out of the bag. She goes right back to terrorizing people lacking in the Halloween spirit.