Nah im with you on this one
Sora is one of my most wanted, but the less non-KH original KH the better
I want more Riku and Axel and Aqua and less Mickey, Donald and Goofy.
Although a Donald Assist Trophy that only heals it self and your allies but never you would be pretty funny.
Yeah, if not for Disney's involvement, I'd be more supportive of Sora as a possible third-party. It's conflicting since KH was my childhood and remains one of my favorite series, but so is Smash, and I have a feeling Disney wouldn't care about trying to respect what Smash is and ask for lots of promotion of their own characters.
And Disney content aside, that still leaves more than plenty of content to work with. Hollow Bastion, Radiant Garden, Twilight Town, The World that Never Was, Traverse Town, etc. could all work as stages.
Riku could be an assist trophy. Terra, Ventus, Aqua, Kairi, Namine, and all the Org. XIII members could be trophies.
Grab a few Heartless for Smash Run/Adventure Mode enemies. Maybe Nobodies if they really wanted too.
And music has got to be where they've got the most options. Yoko Shimomura's music is all fantastic. Fragments of Sorrow, Forze de Male, Working Together, Vim and Vigor, The 13th Struggle/Reflection/Dilemma, Sinister Shadows, Sinister Sundown, Scherzo di Notte etc, etc. Only problem there, is how expensive getting the music would be. Only getting two FFVII songs was already really disappointing.
As for Donald, hopefully he'll be more competent in KH3...