Even though we don't normally see Captain Falcon out of the Blue Falcon in F-Zero games, it's been established that he's a renown bounty hunter outside of being a racer, so it's not too crazy for him to do the stuff he does in Smash Bros.
Aside from that, if Sakurai can make a wacky moveset for a character based on various Game and Watch games (smashing people with a divers helmet, hitting them with a chair, juggling them like a ball, etc) then he could easily make a cartoony moveset for the likes of Villager based off of the items they use and the actions they can do in their games (people falling into holes they dug, growing and chopping down a tree, picking up and placing items easily regardless of size).
Wii Fit Trainer using excise poses and moves and such really isn't far fetched either, it's pretty realistic tbh. A rep for Style Saavy though... idk anything about that game and I doubt Sakurai can make a fun and interesting moveset for some fashion model or designer or whatever you play as. Not to mention its barely even a notable franchise compared to AC or the Wii Fit games, so I doubt it's gonna be represented with a playable fighter.