* Coby will not be affected by the costume magic. His sense of self is shaky enough as is.

* Corbie and Mildmay, yes, and I'm leaning toward something where he won't have a limp. Or a scar. Somehow. But I have no idea what.

* Vex likes the idea of a group or couple's costume. And she already has a witch hat ;)

* Emma doesn't generally dress up for Halloween (it's her cousin's birthday). So someone would have to talk her into a costume, but I feel like, of mine, I could have the most fun with her in this plot. Unfortunately, the only specific idea I had won't work, because it's a licensed character.

tl;dr - Help me come up with ideas?