User blog comment:J1coupe/Juliet Starling vs. Morrigan Aensland. Epic Rap Battles of Video Games Season 7./@comment-5264252-20150701024904/@comment-5264252-20150701030720

OOOOH

Bigby Wolf vs The Fairytale Detective from Dark Parables. Sheriff vs Detective, both of which deal with fairy tales in their work.

...of course, you never actually see the Fairytale Detective while playing as her, which would make it hard for the title card and cover and stuff. ;-;

or maybe Bigby Wolf vs Grimm from American McGee's Grimm? Both deal with darkened versions of fairy tales, but one is a fairy tale character trying to revert to good while the other is trying to turn readapted lighthearted fairy tales into their original, darker versions (while ending up making them even darker than before in the process).