This in the new one? Getting it on launch day. Anyway, here's my roster, you sorry saps!
Most of my comments are personal gripes, so don't take them to heart, but here's my opinions:
-I don't see a point in the Diddy/Dixie combo; both characters work fine on their own. It's not like Pikmin and Olimar or the Pokemon Trainer, where the additional characters depend on the primary character, the Ice Climbers, where we literally never see Nana without Popo, or Zelda/Sheik, where it's the same literal character using a different fighting style. Diddy and Dixie both have more appearances and more abilities as individuals than a single unit,
especially Diddy Kong. Giving Diddy a partner seems like such an unneccessary tack-on to me, when the bulk of his appearances are either on his own or paired with Donkey.
-I don't see Ghirahim having any sort of edge over other one-shot Zelda villains, or (moreso) recurring Zelda characters. He's workable, but to me, he seems like such a mirror of other characters like Skull Kid or Zant, both of which were passed up for more recurring characters like Ganondorf and Toon Link. I highly doubt he'd be chosen over characters like Tetra or Tingle, but of course, I could be wrong.
-I simply prefer original Trainer over Kalos Trainer. I think it's unique enough to where it's an unnecessary change, and the Kanto starters are just as relevant, if not moreso given that they have Mega Evolutions.
-Everything else looks fine to me. I personally am not a big fan of Saki, Dillon, and Pac-man, but I think they're reasonable enough. I like Ray a lot.