Lulu would be cool. So would be Kefka ((Xehanort, you really need to play that game)). Also I wish to see Celes and Locke if they were to have more.

Alas Square ENix never bother to ask me what I wanted. ((Like they would have anyways...*imagines the odd predictament if a SE official started to walk up to people asking who they wanted to appear in the KH series*))