#1 Nikki Cross
Alexa Bliss could also pull off this character because she's great on the mic and has proven to be a fan of cosplay. But she's already established and has a strong character of her own. Nikki Cross has had a good run since officially joining the main roster last year but has come across mainly as Alexa's good friend. There haven't been many layers to her other than that.
When she was a member of Sanity, she was one of the most unique Superstars in all of WWE. Cross was like an unhinged, feral being that didn't fear anyone or anything. She flung herself all over the place and even stepped up to some of the men in NXT, including when she consistently told Aleister Black that "she knew" who attacked him.
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Her accent is thick but she's perfectly fine on the microphone. She's already proven that she would have the physical part of the act down in the ring. In promos, she would be perfect since she could return to acting a bit unhinged. Things could start by popping up in the Firefly Fun House. When she goes completely crazy is where her Fiend alter-ego could come into play.
Cross is already bubbly and friendly on the surface but has proven that when she is pushed or you attack her friend, she'll lash out. The former member of Sanity would see her stock increase exponentially but she'd still have the crowd on her side.