I would love a Toy Story world in KH3!

Aside from that though, I want a hell of a lot of Final Fantasy characters in the new one. Disney is fine, but I want more Square (...enix).

FFVI: EDGAR EDGAR EDGAR! Kefka as a villain, and either Locke or Terra.

FFVII: Already has enough representation IMO, but I'd love to see the Turks making a cameo.

FFVIII: Quistis, Laguna, and Rinoa! Hell I'd love to see Zell and Irvine too, the whole cast as little kids if you will And I think Edea would fit perfectly as a character who is manipulated by the heartless (or whoever the badguy is), but turns good afterwards

FFIX: STEINER! KINGDOM HEARTS NEEDS STEINER! MY NUMBER ONE CHOICE! HE'D BE PERFECT! And I'd want to see Zidane, and either Garnet/Eiko (or both as a cameo). I'd want Vivi to return as well. Villains-wise, I think Beatrix could fit nicely