Halloween ask: Thresh and Nocturne. :D
Chooses the pumpkin: They would both end up having to choose their own individual pumpkin after fighting over ‘the best pumpkin’ and accidently destroying it.
Carves the pumpkin: This would be another argument because they’d both wanna carve it.
Gets scared and clings the other in a haunted house: We’re talking about Thresh and Nocturne here, they wouldn’t be afraid of a haunted house, they’d probably spend the entire time laughing and pointing out how unrealistic it was
Matching costume idea: Oh Noc. Definitely Noc.
Makes a cozy bed-fort to cuddle in: Nocturne would do this even though neither of them sleep.
Steal’s the other’s candy: Noc again. I can’t imagine Thresh would care until he horked it all up on his floor since he doesn’t actually have a functional digestive tract
Accidentally gets lost in a corn maze: They wouldn’t get lost in a corn maze, unless it was some kind of trippy dream sequences corn maze. Which is a plausible situation, considering.
Tells spooky stories to scare the other: This would be another dick measuring competition between them. I don’t think either of them would actually succeed in scaring the other
Collects cool-looking leaves: Thresh. Noc is a cat hoarder not a plant hoarder