I wouldn't hope TOO much for Last Story/Pandora's Tower/Xenoblade to make it into Smash 4 in character form for sure. Same goes for Takamaru and Sukapon, really. For a few reasons.
1) Japan Only- I know, Fire Emblem, right? But Fire Emblem was a long running very popular franchise, as opposed to one game apiece. Besides, they BARELY made it over in the first place. But limiting the exposure of a character to one of the smaller gaming markets? Not a good sign for gaming icons.
2) One Game- No character franchise in Brawl at least was a one hit wonder. Captain Olimar had two. Pit had Two. Ice Climber has a half-dozen rereleases and ports. R.O.B. has a couple. Those games are a single, not a franchise.
3) Murky Depths of IP ownership- Probably are using Nintendo for distribution and are third-party.
The franchises we can realistically expect would be like...
Custom Robo, Animal Crossing, Wars, Legend of Starfy, etc.