Blackout Pulse - Nightmare Night Costume

Here's a quick sketch of what i'm working on at the moment, it's far from finished since i have to do the lineart and the Colours properly instead of throwing it together like this. This is Blackout's Nightmare night Costume, i want to try and do a bunch of my OC's wearing costumes and i drew blackout first since she's my favourite.

Also, Anyone want to guess who she's dressed up as?

Other characters i'll draw
Copper Compass - Nathan drake from uncharted
Caramel sundae - Finn/Fiona from adventure time
Racket - A candycorn (it'll make sense)
Anna - A robot (Ironically)
Caliber - No idea yet
Xander - No idea yet
(And possibly more if i have enough time - Suggest costumes for my other OC's if you want)