Are you sure that the box art is completely conclusive evidence? Because that alongside Wii U means that the newcomers Rosalina, Little Mac, Villager and Wii Fit Trainer will all be starter, along with Link, Mario, Pikachu, Pit, Samus, Marth, Yoshi, Kirby, DK and Peach. Don't you find this at least a little excessive? While the majority of those characters (Link, Mario, Pikachu, Pit, Samus, Yoshi, DK, Kirby, Marth) makes sense to me, others (Rosalina, Wii Fit Trainer, Peach, Little Mac, Villager) really doesn't. Think about it, if we're following that logic, then one of every series will be starter besides 3rd party, as otherwise it doesn't make sense for someone like WFT, Little Mac or Villager to be starter.It means that Mii Fighter, Fox and Pikmin & Olimar will be starter too. It just really doesn't seem like enough unlockables, because assuming all veteran series' are coming back you still have these starters: Wario, R.O.B, Ice Climbers, Captain Falcon, Ness and Mr. Game & Watch, as well as probably Shulk and a RH Rep. This is a total of 24 starters, almost if not already half of the final roster. And it also means that Mario will probably not have an unlockable character. Same for Fire Emblem and Zelda. If we follow this logic, the only unlockables out of Nintendo's big 8 will be Jigglypuff, Meta-Knight, 1-3 Star Fox reps (hopefully 3), Ridley and K. Rool/Dixe Kong/Both (but probably not both). This is why I find an actual theory about all characters revealed already being unlockable totally baseless. All unlockables would be from unknown franchises using the logic here, which doesn't seem to give the player and actual incentive to unlock them. Especially the casual players, who only stick to the main franchises Nintendo has to offer. If they're all open for them to use from the start, why does he want to unlock more characters he doesn't know or care about?
That being said, there are 4 reps for Fire Emblem. I see Marth and Robin being the starters for the franchise.