Banjo, Sora, and Dante are the only ones I can truly get behind 100%, and I'm not even a fan of Banjo-Kazooie, Kingdom Hearts, OR Devil May Cry.
Like everyone else, I think Erdrick is all but confirmed. I also think he's really boring and lame.
Klonoa would have to be my #1 personal choice if Sakurai personally asked me to pick a third party character with no regard for what anyone else wants, and it makes me happy that he seems to be a popular choice with other people as well, but I think his cult status and utter lack of relevance in gaming right now mortally wounds his chances.
Monster Hunter would be boring, but I could accept it by virtue of it being so odd that we have a Monster Hunter boss, but no playable rep. Travis Touchdown and Lloyd Irving wouldn't be very exciting for me, but I can still see them happening. Ryu Hayabusa would be cool-ish, but I share the uploader's concerns with his moveset being too derivative, since we already have two ninjas in the game (as well as one character named Ryu). 2B would be cool, I guess, and even though I don't care about Nier, I still think she has a chance, given that we have three M-rated characters at this point.
Crash and Spyro can't happen unless they're BOTH in the game, imo. They're basically counterparts, and you can't have one in a crossover fighting game without the other, as far as I'm concerned. And, frankly, wasting two DLC slots on these two characters would be kinda lame. I just don't see it happening for either of them. Marvel vs. Capcom 3 proved that both Amaterasu and Phoenix Wright can work in a fighting game, but I don't personally expect or want them. Chrono Trigger is a cool game, but we don't need Crono in Smash. Neku is eh.