More pieces to the 'wtf happened when the world was destroyed' story. More active darkness attacks. Okay, that's cheating because I want that in general. Um... Some kind of body of water, since Roxas seems to be gravitating toward those in both realms, for emotional moments. More portals, like in Beauty's realm. Maybe more technology, at least sporadically, so that, IDEK, the characters can have movie nights?

Reverse?