I also think Bandana Waddle Dee would be a good choice, because most Kirby characters already have movesets that would fit perfectly in Smash (for example, he already has an attack that would work perfectly as an up special), and Kirby needs more representation since he hasn’t had a new character since Brawl. I also think we should have another Zelda character that isn’t just another Link or Zelda. Oh, and also, Waluigi. I know we have enough Mario characters, but it’s Waluigi. The meme has gone on for long enough. I think Paper Mario could be interesting because of all his partners.
I don’t actually think there should or would be any other Animal Crossing characters because I really can’t think of any good movesets for them. Playing as Tom Nook or Resetti would be really funny but like, what would Tom Nook’s specials even be? They already had to get really creative and make up moves that don’t really have inspiration for Villager and Isabelle, like Villager’s side smash. I wouldn’t be against it at all, actually, I would love to see what they could come up with, but if I was in charge I probably wouldn’t include any. Idk, you can quote me and tell me why my opinion is wrong if you feel like it.
Totally not biased but I think there should be a second Pokémon trainer based on Ethan and Kris/Lyra using the Johto starters. They could also do this for the other unrepresented regions but I’d want Johto the most and it would make the most sense since it’s the second generation and the trainer we have now
For third parties, I think Zero or Proto Man would be a great Mega Man character, and there’s a lot of good Sonic characters to choose from, but they’d probably just go with Shadow, Tails, or Knuckles. Those are the characters I’d want the most though so it doesn’t really matter to me anyway. Maybe Gruntilda but it would be a little weird to add another Banjo Kazooie character. But Crash would be a nice character to see. I think maybe Dante from Devil May Cry would also be a good one? I’m kinda just thinking of random third party characters right now.
Finally, I’ve noticed that every Smash game after the first one introduced one really stupid character (Melee had Mr. Game and Watch, Brawl had ROB, 4 had Wii Fit Trainer, and Ultimate has Pirahna Plant). For this game, I think Qbby or Dr. Kawashima for no real reason other than those were the first random characters I could think of.