I am thinking of doing a Sonic version of the Kingdom Hearts games, after getting Re:CoM the other day and reading some fanfics by someone named Babylon Sky Hawk. Unfortunately, this is the cast I intend to use, right now:

Tails as Sora
Cosmo as Kairi
Silver as Riku
Ray as Mickey (I hate Disney for abandoning their mascot!)
Cream as Minnie (As well as Mickey's girlfriend!)
Black Doom as Maleficent (kinda borrowed it from BSH)
Mephiles as Xehanort (or at least, his Heartless; again, borrowed from BSH)
Shadow as Leon
Waspinator as Pete
Chip and Charmy as Chip & Dale
Sharah (wait, did I spell that right?) as Merlin (again, I borrowed it)
Omega as ??? (I'll let you decide, but make sure it's a good one!)
NiGHTS as Yuffie
Sonic versions of Organization XIII (except Roxas) as ...well, the organization.

Unfortunately, that's all and I don't know who to put for the rest, nor do I know which worlds I'd like. So, I need you to comment and tell me who you'd like to use in the remaining spots and what worlds to visit. You can use OC's, but make sure you give a drawing of what they look like. Well, good luck! I'll post the fanfic on Fanfiction.net. The deadline is March 31st, so hurry up!