It would be pretty cool although I don't know if Ganon is associated with a single sword unless that sword is Ghirahim. I personally liked Ganon in Melee, Brawl, and Project M.
I think Pokémon Trainer is probably going to be replaced by Charizard.
I want to see Snake in this next one because of the new 3rd Parties.
There might be a way around it, if they allow Classic Controllers for Smash 4