Project X Zone: Beat it. Game is simple and fun, but not much else. It definitely comes off as something intended to play in short bursts at a time, not a "marathon and beat this all at once!" due to it's structure. It is better than Namco X Capcom since while that game was beefier, PXZ is just so faster. No, maps don't take longer than NxC; average map in PXZ takes about an hour, these get a little longer come end game; NxC, some maps can take upwards to 2 or 3 hours. PXZ also has things like, say, animation skip for attacks, and counter attacks don't suck roughly half way into the game, Multi Attacks are a HUGE deal in this case, being legitimately good crowd control, what have you.
Also, this game lacks Leon, and instead gives us Yuri. Also lacks Shion and gives us...ok, her replacement isn't much better.
6/10 game, and now to derail it with something I know Djinn would thumbs up:
POTENTIAL IDEA: Nintendo joins the crew!
By which I mean I am looking at Nintendo's franchises and picking which ones would fit into PXZ. Remember that PXZ had a consistent design standard for the most part, using only Humanoid characters with something resembling realistic proportions, or easily reimagined without harming the design, hence why some "no brainers" didn't get in like Sonic. You'll also notice they used MMX characters, who probably are the easiest to transfer into Adult Humans while still looking relatively normal. So yeah, I am taking this into account.
Here are some franchises I feel would work, and potentially thoughts on characters that I could see being used; if I leave the franchise blank, it's probably lack of knowledge of the franchise. Also, only covering good guys, so PCs and Solo Units!
With that said, HERE WE GO!
Legend of Zelda: Link/Zelda team up seems like an obvious thing; I know I said no villains, but Ganondorf does feel like a shoe-in there.
-As a bit of an aside, a meta thing to consider is that Capcom actually made a few Zelda games in the past, so Link being in a crossover with Capcom characters included is fitting! (...shut up about the latest Smash!)
Fire Emblem: I'm just gonna say Chrom/Robin as a team (Robin wearing a hood to avoid canon silliness), and Lucina as a Solo unit. Feels like it fits FE Awakening the best. A second team could be in the game, ideally from characters NOT from Awakening's Universe, just to illustrate the raw scope of FE Cast, kind of the way Sakura Wars had characters all over the place from my understanding in PXZ.
Metroid: Samus is a Solo Unit; seems logical enough.
Sin and Punishment
Xenoblade
Golden Sun: Isaac/Garet team w/ Ivan as a solo unit! Yes, Garet will start asking too many questions, and one of the "bad guys" PCs like Heihachi or Demitri will tell him to just shut up, and everyone will cheer, YOU KNOW YOU WANT TO SEE THIS.
F-zero: Captain Falcon is a solo unit, THE FALCON PUNCH MUST BE IN THE GAME DAMN IT!
Punch Out: Little Mac could make a fun Solo Unit
Pokemon: Here me out on this one; the Pokemon Trainer is a solo unit, where in he has 6 preset Pokemon he uses in his attack. Something like Pikachu, 3 starters from different regions and typing, possibly stages too, a legendary, and an Uber as his finisher. Yes, this would be absolute madness on the battle field but isn't that what PXZ attacks moer or less end up as?
As in, a team would look like Pikachu, Bayleef, Blaziken, Piplup, Terrakion, and Yveltal; this is purely for example reasons, nothing more.
Legend of Murasame or whatever it's called: Takamaru as a solo unit. Because screw you, that's why.
Kid Icarus: Pit and Pittoo as a unit. hey, if PXZ can put KOS MOS and T-elos together, I don't see why this is impossible. Also Palutena as a solo unit because DIVINE POWER OF TROLLING!!! is a must.
As an aside, Bayonetta would be perfect in a game like this. Given her first game was published by Sega, and her second game is being published by Nintendo, and she's made by a bunch of former Capcom guys, she'd be bridging like 3 companies together or something like that!
Anyway, probably others I've forgotten, or we can take more units from franchises or something, but that should be a start for an idea of adding Nintendo's roster into the mix!
Why Nintendo? Well, Monolith Software did help develop the game and they're owned by Nintendo so...