Characters wanted in Japan.
Also I do agree, this thread has been moving rather fast. lol
Let's see:
Mewtwo and Roy: Melee Veterans, wanted worldwide.
King K. Rool: Popular worldwide.
Shulk: Worldwide support now.
Miis: Worldwide popularity and support.
Slime: Worldwide again.
Professor Layton: Again, worldwide.
Dixie Kong: Again, worldwide. Has the fact she was cut from Brawl working for her, in a way.
Takamaru: Has support outside of Japan, actually. Quite a bit.
Claus: Not sure on his support outside of Japan, but I've heard it's large. Too bad I feel Mother has enough as it is.
Zoroark: Expected, but not really wanted. This is true worldwide.
Little Mac: Not too popular in Japan, but very popular in the States. I can easily see Mac in Smash.
Golden Sun character: Most likely going to be Matthew if any. Try and try as Americans clamour for Isaac and some Japanese do as well, Camelot, I assure you will decide who. They will pick Matthew, hands down. American support for a GS character MIGHT push one, I admit.
F-Zero and Metroid: While F-Zero is unlikely to get a new character, IMO, Metroid is likely to at least get Ridley, who is a heavily supported and debated character.
Last Story/Zangeki no Reginleiv characters: Not likely at all. This falls into the "only popular in Japan" category.
Starfy: Not seemed to be wanted all too much. Either that, or people want other characters MORE.
That's what I got out of this.