Some of those aren't likely, I seriously doubt Fawful would ever cross Nintendo's minds.
I could see King Boo very easily
a new Pokemon is possible
Louie is likely a no because he'd be too close to Olimar, but an enemy might be reasonable
Tom Nook would make sense, AC is a fucking huge series being completely honest.
FE rep is likely for 3 Houses
Poochie is unlikely but who knows, if they want an odd pick it could make it
I don't see DK getting anyone past K. Rool, honestly, because they said no echos and any of those would be fine as diddy/dk echo
I honestly don't see Kirby getting another rep, again possible but the timing is off
Banjo is possible but don't overstate his possibility, the grinch leak WAS fake
DQ has some controversies right now, probably gonna pass it
SMT? No fucking way
Travis Touchdown is possible I suppose
A Doom rep might work, but I'd expect Bethesda and Nintendo would BOTH want Dragonborn first
Wonder Red will not make it in, did you see the sales of W101? It got nothing, a third of a million. They can try the series again, but that flop will not get a rep in Smash until it redeems itself.
Phoenix Wright would be awesome, but I really don't think Nintendo would choose him.
Rayman is less likely than a Rabbid at this point, but it's possible.
Pauline would never fucking make it as a unique character, at best it would be an echo of Peach, but the DLC is for unique characters with their own stages, and New Donk already exists with Pauline in it.
None of the BOTW champs will be playable, that's just not a thing. I hate to say it, but they'd go for Skull Kid of all things first.
Xeno2 wouldn't happen because they gave us a costume of Xeno2 as an apology for getting no DLC character, Sakurai already confirmed that.
I really doubt Yokai Watch because Nintendo doesn't own it and The Pokemon Company despises it.
Metroid characters are possible but I don't know the series
Amaterasu would need more than a remake port.
The last 2? Nah.