10 villains?
1. Pig Ganon(ALTTP, who has yet to appear in Smash at all, oddly enough)
2. Porky(not sure the best way to make him work, but he's only there on a technicality as a spirit, assuming they just used the slightly wrong sprite of Absolute Safety Capsule)
3. Black Shadow(sweet echo option for Ganondorf to have his Brawl/4 moveset. Fits his proportions way better than Falcon, at least. ...Which is odd, but)
4. Dr. Eggman(definitely using Bowser Jr. as a base, of course, since the vehicle is his best part)
5. Dr. Coyle(Semi-clone of Min Min, but different abilities and obviously no dragon arm. Probably more unique than Isabelle in terms of changes? Hard to say on my end)
6. Kamek(I wonder what he'd be named in Japan, though. Since Kamek is the name for Magikoopa there. I forget if he has a changed name...)
7. Shadow(Sonic echo aside, I definitely want him to use abilities from his various appearances. Orbital Laser would be a cool Final Smash, for instance)
8. Fulgore(I mean, it's the mascot of Killer Instinct. That alone says something. That, and a unique take on a shotoclone, especially with new abilities in the reboot game)
9. Nightmare(Soul Calibur character who isn't just the mascot, but has evolved in many ways. Now it's just an armor at times, or has many different hosts. Which allows for a variety of moveset options. And tons of ham. But Soul Calibur without ham is like a pig without a blanket.)
10. Tom Nook(well, if we're pushing it. I'd love another semi-clone, but at least can use Isabelle for the base far easier since they're the same actual proportions. A money-based moveset, but can use all kinds of items and stuff from New Horizons too).
I did run out of ideas on number 10, I admit. But... I do want to see him. Mr. Resetti is another option, but he doesn't feel like a villain but just a guy doing his job and legitimatley cares. Same with Don Resetti. ...Redd is questionable.