Now, in terms of Mewtwo/Pokemon. I can't say I'm terribly thrilled with the lineup of Pokken so far. Besides Machamp and Blaziken, I'm not really feeling any of the other ones. Gardevoir in particular bothers me, as this was a perfectly good chance to give Gallade some much needed spotlight.
1. We have Lucario and Pikachu, who aren't surprising as they are mascots of Pokemon
2. Machamp and Blaziken who just make sense, due to the fighting type.
3. Suicune who's not only surprising and properly representing gen 2, but opens the floodgates for other legendaries to join in *cough*Mewtwo*cough*Deoxys*cough*Darkrai*cough*
4. Gardevoir, who's the original and imo better than Gallade. I'm biased though, as Gardevoir is my #2 favorite Pokemon...#1 obviously being Mewtwo.
My thoughts on playable Pokken fighters are:
1. Mewtwo, Charizard, Jigglypuff, and Greninja are already in Smash, so they obviously make sense for another fighting game, therefore putting them in here would be epic and just feel like a given.
2. I feel Deoxys would be interesting, especially if you could change forms mid battle...pretty much what I theorized way back before Rosalina was announced for Smash, saying he'd fit in perfectly with that, but I digress.
3. Darkrai and Cresselia would be just straight up epic, especially Darkrai.
4. Zoroark could be interesting, especially if you could shape shift.
5. Magikarp would be a huge troll move and quite amusing...until it evolves into Gyrados and destroys everything and everyone...or it'll just use splash. :3
I could say more, but I think these 5 thoughts will do.