I think that some of the character choices weren't really amazing, especially since I was hoping to see fewer clones. I very much think that Lucas and Ness are pointless to have together; pick one or the other, HAL. I'd much rather see Dr. Mario and Mario and maybe only Ness than only Mario, and Ness and Lucas.
I think that Wolf should be taken out - as he isn't really even in SSE, and he's a clone. They should've seriously considered putting in Sora, except that'd make too many sword characters. I think they should've considered Ridley and Waluigi. And especially Cloud/Sephiroth.