Hmm. Interesting. I feel like there's some characters and franchises that are screwed, like Ness and Earthbound, so that sucks. And I'm just guessing that King K. Rool cannot be used because his only Switch appearance was actually on Smash Bros.? Darn it. Well, anyway.
I've highlighted every newcomer who has never been in a Smash Bros. game before in bold text.
For one newcomer (Andy), if you don't know who I'm talking about, I mean Andy from Advance Wars. I think where the other newcomers are from is pretty obvious, right?
For Pokemon, I checked every single Pokemon game on Switch to make sure all of my Pokemon picks were in them, and they are all indeed in at least one of the Switch Pokemon games.
Tawna over Crash himself, Cortex, and Dingodile? Bold move.