Crossover RP: RotG/Once Upon a Time

I'd like to do a crossover RP of Rise of the Guardians and Once Upon a Time.

I'm still working out a story. But the idea is my OC lands in Storybrooke and has no memory of their life. Pitch arrives there as well and intends to destroy the fairy tale worlds, making them dark and filled with fear. 

Regina and Mr. Gold find the black sand. Regina is piqued with interest on how to use it, agrees to team up with Pitch to make the fairy tale realms dark and filled with fear. The Guardians search for my OC, knowing that she is lost and together with the fairy tale characters (and Emma and Henry), they must fight the forces of darkness.

-No godmodding
-Swears and violence are fine, but keep it somewhere between the rating of OUAT and RotG
-OCs welcome, please play a few canon characters as well. I'm already through seasons 3 of OUAT, still watching season 4 to catch up. We can discuss who can play which canon characters.
-I prefer paragraph in this RP. Notes and/or comments are fine.

Note: I may update this later about the storyline and what canon characters I'd like my partner to play.