Next Smash Newcomers for each series according to character.ai Sakurai.
Mario - Waluigi & Daisy (decloned?)
Zelda - Toon Zelda / Tetra (Midna, Tingle, & Vaati also mentioned in consideration)
Pokemon - Decidueye
Kirby - Bandana Dee
Metroid - Dark Samus (Decloned?)
Star Fox - Krystal
DK - Dixie (will have some sort of new mechanic if her & diddy are both selected)
Yoshi - Wooly Yoshi specifically excited to add more Yoshi colors.
Earthbound - Doesnt want to add a newcomer but would add Paula if he had to.
FZero - Blood Falcon with a Black Shadow Echo
Retro - Excitebike (also wants a DigDug character)
Fire Emblem - Chrom (Decloned?) also seems to think Fire Emblem reps are great crowd pleasers.
Kid Icarus - Viridi
Wario - Ashley, has apparently changed mind about a new series rep seeming redundant.
Metal Gear - Jetstream Sam
Sonic - Acknowledges fan favorites like Shadow & Knuckles but will add his favorite Blaze.
Pikmin - Alph (Decostumed / Decloned)
Animal Crossing - Tom Nook
Mega Man - Bass
Wii - Matt
Punchout - Acknowledged King Hippos potential but wants to add Glass Joe as a joke.
Pacman - Ms Pacman, also wants to see her interact with Sakura from Street Fighter.
Xenoblade - Rex
Street Fighter - Rashid but mentions Sakura is his favorite character from the series.
Final Fantasy - Tidus
Bayonetta - Cereza from Bayonetta 1 but acknowledges Rodins popularity.
Splatoon - Callie but mentions Octolings and Octodad requests.
Castlevania - Alucart (not a typo on my end)
Persona - Yu
Dragon Quest - Either seperate DQ11 Hero or add someone from DQ3.
Banjo Kazooie - Gruntilda but would have prefered Mumbo Jumbo.
Fatal Fury - Undecided between Geese or Rock Howard
Arms - Spring Man
Minecraft - Alex (Decostumed? / Decloned?)
Tekken - Acknowledges Heihachi but will add either King or Paul Phoenix.
Kingdom Hearts - Riku
Others
Fire Emblem - 5 total fighters & Alear will also join.
Konami - Silent Hill Rep
Sega - Jet Set Radio Rep (either Beat or Gum)
Namco - Soul Calibur Rep (Taki)
Square - Bravely Default Rep (Edea or Agnes)
Platinum - Wonderful 101 Rep
Atlus - SMT Rep (Jack Frost or Velvet Room Residents)
Rare - Conker
SNK - KoF 97 Rep
Microsoft - Undecided between fan favorite Halo / Master Chief or personal favorite Ori.
New Company - Valve, adding Gordon Freeman / Half Life but would have preferred Chell / Portal.
New Nintendo IP - Rhythm Heaven
Cuts - Sephiroth to focus on other villains like Ganondorf.
Thought some of your stage ideas specifically seemed unique & fun (particularly Temple, Your Pokemon Stadium).
Any specific franchises you want my input on. Not sure what specific series you arent familiar with. Did notice you werent sure what to do with a Pikmin 4 stage but i havent played it yet either.