I took a glance at that Reddit pie chart that showcases standing amongst "survivors", and here's my personal opinions regarding the Top 20.
Micaiah: Unfortunately, know little to nothing.
Viridi: Reset Bomb Forest deconfirmed her in my eyes. Plus, Medusa deserves it WAY more than her.
Prof. Layton: Probable, but considering another Level 5 character is in this thin, we may have to go give it to the cat.
Shadow: Obvious Sonic Echo, but the problem is Shadow plays EXACTLY like Sonic, so what would make him more than just a random skin?
Arle Nadja: Probably unlikely.
Phoenix Wright: Personally, given that I dislike Ace Attorney in general due to it feeling stupid, I'd actually would put Wright in my "Do Not Want" list.
Jibanyan: Assumin that the game was organized during the height of Yo-Kai Watch's popularity in Japan, it's likely Jibanyan will be in Smash Bros.. Though I'd love to play him, in reality, he's more likely to be an Assist Trophy.
Custom Robo: Doubtful will return.
Sora: Another "Do Not Want" character.
Captain Toad: New Donk City Hall kinda deconfirmed him, apparently.
Rayman: A guy I do want in Smash Bros. badly, given how the studio who makes Rayman games would literally work for free just to put him in there
Wonder Red: Given how 101 flopped, I doubt it.
Dixie Kong: Very likely a Diddy Kong Echo.
Magalor: Popular in Japan, but considering Bandanna Dee on the list, I'd give it to the spear fellow.
Geno: This one is rather litigious given the circumstances, but considering all the stars have aligned for him, why the hell not? Super Mario RPG essentially broke the door down for JRPGs to be liked in the West.
Shantae: Most likely an Assist Trophy, not unlike Shovel Knight.
Paper Mario: No appearance besides regular trophy.
Bandanna Dee: If Kirby gets a fourth character, it would most likely be him.
Banjo & Kazooie: Things definitely look good for the Bear and Breegull, and could pave the way for more Microsoft fighters.
Isaac: No prizes for guessing how I feel about him.
So, based upon that Reddit pie chart, out of the 20 top, I got 2 deconfirmed, 6 unlikely, 2 I absolutely want nothing to do with, one I don't have an opinion on, and 9 that have a puncher's chance with 2 almost guaranteed due to Echo Fighters.
As for the remaining seven "potentials", I see Jibanyan & Shantae being in as Assist Trophies in spite of having enough moveset potential to be fighters (Jibanyan may be stretching it, but considering we're looking at OG Jibanyan here, he'd likely be a comedy fighter with plenty of his Specials being from the Busters/Blasters spin-off series), and Rayman, Geno, Bandanna Dee, & Isaac as base fighters with Banjo & Kazooie as DLC.