Admittedly, I left Corrin off on purpose. Probably residual bitterness from his reveal and a general annoyance at the amount of FE characters, though there's nothing I inherently dislike with the character.
Cloud's omission was also deliberate. I don't have anything against third parties, but not only does Cloud not make me think of Nintendo, in my mind he actively represents the Playstation and one of Nintendo's greatest blunders (the CD-ROM debacle). That said, he's popular and his inclusion made a lot of people happy, so I'm ok with it, but if it were just up to me, he'd be left off.
Since I'm bored, I figured I mind as well give a prediction as well. Left it off the first time since I tend to be pessimistic about these things. Unfortunately, my roster maker is outdated so bear with me. The Fire Emblem character represents Corrin, and the two Smash Balls represent a Pokemon rep and an Arms rep.
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This is going off the possibility of Smash 4 Deluxe. Wolf (popularity) and the Ice Climbers (technical fixes) are back, and all DLC is included with the game. Added the Inklings as I can't see how they would be left out of the next one, regardless of whether it is a new full game or Deluxe version. I also decided to be hopeful and add K. Rool as a purchase incentive. He must have impressed on the ballot, and I feel like the Mii costume is at least some acknowledgment of his popularity. New Pokemon and Arms rep are blatant advertising, but I'm not going to complain about new characters.
If we're talking about a new full game, I'd add the following in order of most to least likely:
* A retro rep. Takamaru is perhaps most likely, though there's plenty of other possibilities.
* A new third party. Again, I wouldn't rank anyone high enough to specify them. Maybe Rayman, if I have to be decisive? Then a Snake return? Would it be crazy if I thought Geno might be the next after that, though? Ehh, let's be adventurous and say two out of those three.
* Captain Toad
* Ashley
* Dixie Kong
* Bandana Dee
I want to believe in Isaac, but not sure if I should be either encouraged or very disappointed by Isaac's disappearance last time around. Unfortunately, my negativity leans me towards the latter.