Toy Story.  I think a Toy Story world would be amazing, I mean, could you imagine playing as a toy version of Sora?  He’d have a pull string and everything, it would be great!  I’d also love a Princess and the Frog world with Tiana and Sora having some bad ass team attack.  I’m not sure if Wreck-it-Ralph would be possible, but it would be hilarious, Ralph would be game jumping and Sora would be like, “… game?  You think this is a game?”  Also Big Hero 6 just cuz super hero Sora.  

Edit:  Monsters Inc. should also be a world!