I've done it before but imma do it again because i'm always looking for feedback:
This is my roster. I edited it again. The characters on the right are characters i would be willing to add/swap with one in my roster. Characters like Ghirahim, Paper Mario and Shulk are personal favorites of mine, which is why i have them in my roster. Krystal is there basically just to be there (i could take or leave her tbh) I feel like its a relatively likely roster, but maybe not entirely realistic. let me know what you think!
EDIT: And yes, I KNOW Pac-Man is probably more likely than Lloyd, but i think Lloyd would be a cooler character. But hey, to each his own
I'll give a critique.
First off...all Brawl characters. Check! I like when cuts are not made. (Assuming Sheik and ZSS are still there).
For Paper Mario, I would personally prefer Bowser Jr. or Toad, but he's a good pick. No qualms there.
King K. Rool is awesome as always.
Ghirahim. While not the
most likely, I feel that if we get a Zelda newcomer, it'll be him. That being said, he's a decent pick, and one of mine as well.
Ridley is Ridley and Ridley is great.
Little Mac and Takamaru are nice choices. If you did want to swap Takamaru for a different retro, Muddy and Mach Rider are good choices, each with their own merits and drawbacks. Up to you, really.
Now, you did mention that Krystal was just there to be there. Perhaps swap her out for Goroh? It wouldn't hurt the organization, and I personally find F-Zero more likely than Star Fox to get a rep this time.
Mewtwo Returns. Yes. You could go as far as to add Zoroark as well, if you don't feel it's enough.
Roy or Krom can go either way in my eyes, so whichever you prefer.
This may just be a personal thing, but I don't think that Saki, Isaac, and Shulk will all be in. Now this is not due to their designs, it's just that Sakurai has been pretty iffy in the past as far as adding smaller non-retro/non-hardware/non-third party series. In Melee, we added Fire Emblem. In Brawl, Pikmin and WarioWare. Here, we get Shulk, Little Mac, Saki, and Isaac. I'd personally lose one of the blondies, only because Little Mac is a bit more likely in my eyes. Perhaps add in Palutena to add a KI character? She's pretty popular with requests. Maybe even Mii, to add a Hardware character that's big with Nintendo.
One last thing: 3rd Parties.
Mega Man has the demand to get in for sure. He's a good bet.
My only problem is the sheer presence of a Namco rep. I know they're helping with the game, but ultimately Sakurai has the final say. He doesn't want to go overboard, and in general the only 3rd Party who has anywhere near Sonic's demand (who barely squeaked by in Brawl) is Mega Man. I just don't think a Namco rep will happen at all under these circumstances, due to low demand. But, to each his own.
As far as the size, it's pretty feasible.
Overall, it's a solid roster, despite some kinks here and there. Nice job, I give it a 9/10