Also i have always wanted to play co-op Kingdom Hearts, and i'm sure a lot of you feel the same way, so being able to have a friend or friends drop in and be able to control either Donald or Goofy, online story mode would be so cool and spli-screen for local. Also if more than two friends want to play, they can drop in and play as other friendly characters met in the story.
Interesting idea. I couldn't imagine myself playing local co-op, at least my first time through, but online would be nice, especially to replace Donald (if I had friends who played Kingdom Hearts anyway, haha).