Mario: Tennis costume, Tanooki suit, or Wrecking Crew costume.
Donkey Kong: Lots of choices here. You could go for Funky’s clothes, you could go for Punch-Out Wii, you could have him put on his old Donkey Kong Jr. getup, Strikers getup, lots and lots of options. Unfortunately, though, legal rights mean we probably can’t get cartoon DK.
Link: Gerudo Link from BotW.
Samus: Fusion Suit.
Dark Samus: I feel like a lot of the concept arts for her could be neat alts. R just go for gooey phazon true from dark sammy idk.
Yoshi: Pirate Yoshi? Really, I don’t have much of a clue.
Kirby: Classic derpy Kirby face.
Fox: Easy fanservice. Melee Fox.
Pikachu: Cosplay Pikachu was a whole thing so they have plenty of options. Alternatively Raichu perhaps?
Luigi: Pipe Dream, But Gambler Luigi from Mario 64 DS.
Ness: Pajamas are obvious. If you wanna get creative, I think it’d be neat if they went with a retro Earthbound styled costume, with a Super Nintendo Entertainment System logo on a white hat, and a shirt with the sprites of Ness, Jeff, Paula, and Poo, wi5 “This game STINKS!” wiritten on it. But yeah pajamas are the classic so
Captain Falcon: Retro Falcon would be neat. Maybe even Maskless Falcon? ...nah, probably not.
Jigglypuff: Igglybuff idk
Peach: Wedding Peach.
Daisy: I’d say Sports Daisy but I think that might change her physics and hitboxes too much to make sense so I honestly have no idea.
Bowser: Wedding Bowja.
Ice Climbers: Polar bear themed suit like in Project M?
Sheik: Hyrule Warriors/OG OoT based design
Zelda: TP Zelda
Dr. Mario: Not gonna lie. I have absolutely no idea.
Pichu: Pichu Libre. I know that’s never been a thing, but **** you, it sounds adorable.
Falco: His design from the Star Fox Assault concept art.
Marth: Taking another Page from PM, Sigurd.
Lucina: Like Daisy, a wedding dress would probably screw over the physics. Lucina with mask always on is obvious but a tad too simple for presumably paid DLC. So, that leaves us with only one option: Bunny Girl Lucina. You know you want it.
Young Link: Theoretically you could just have Young Link wear any of his masks. Or you could give him Fierce Deity face painting and color? Or tweak his design to be more like Majora’s Mask? Or get him in Tingle’s suit? Or even have him wear Majora’s Mask? Lots of ideas here.
Ganondorf: Demise? TP Ganondorf? I want to say HW but that isn’t repped in the game at all so I’m hesitating.
Mewtwo: Easy, the armor.
Roy: Awakening DLC design.
Chrom: Tokyo Mirage Sessions design, probably my most wanted one on the list.
Game & Watch: Might be a harder sell, but maybe redo Game & Watch’s animations to look like previous games as opposed to how he transforms into other G&W games in Ultimate? ..Yeah I don’t have anything better.
Meta Knight: Morpho Knight.
Pit: Three Sacred Treasures Pit. Or Great Sacred Treasure? Classic Pit maybe?
Dark Pit: I have no idea, so I have to by default go with Raiden’s sombrero disguise from Metal Gear Rising but on Dark Pit.
Zero Suit Samus: Young Samus from Other M.
Wario: Wario Deluxe from Gold.
Snake: Naked Snake.
Ike: For these characters that have two major costumes, I’m gonna cheat and put one for both. For PoR Ike, his Lord costume. For Radiant Dawn, his Vanguard costume.
Pokémon Trainer: Pick your favorite Trainer I suppose. They could go with Sword/Shield if they wanted to promote, or maybe even the Let’s Go trainers. Male and female variants. Pokémon would probs just get new colors tho
Diddy Kong: I feel like a yellow-eyed, shadowy Diddy based on the Brawl Subspace would be neat. But come on, you all know we need Diddy with the shades from DKC2, it’s obvious.
Lucas: Pretty easy Pigmask alt is pretty easy, but I think it would be really cool to see Lucas jacking his brother the Masked Man’s clothing and mask, it’d be neat to see the people who want him in get a bit of a consolation prize in the same way it was to see X be an alt for Zero in MvC3 lol.
Sonic: Boom Sonic? Riders Sonic? Live action Sonic? (oh god no)
King Dedede: The best I can come up with is altering him to make him look more like his Kirby 64 appearance. Masked also comes to mind but that’s his FS sooo
Olimar: Louie is obvious, and has been requested for a long time, but **** that, aight? I’m going costumes here, Alph already is a character switch, and I’m determined to stick to keeping the characters the same. So, what do I have in mind? ..Fo both Olimar and Alph, no clue.
Lucario: Also no clue.
ROB: Ancient Minister would be a fantastic one to see.
Toon Link: A popular one would be his Outset Island garb, but I’d personally rather see him in his Conductor getup.
Wolf: Brawl Wolf would be my pick, though I’d also like a Starlink themed alt.
Villager: New AC Villager I guess.
Mega Man: Protoman, Bass, literally any of the Mega Men in his final smash, there are so many good picks here. Alternatively, you could go with Copy Robot from Mega Man 1 and 3, but it would have to be Archie design to have any difference and idk if they could get the rights
WFT: No clue.
Rosalina: Cosmic Spirit, easy peasy.
Little Mac: The main dude from Super Punch-Out.
Greninja: Ash Greninja, But you can actually see him? Idk?
Palutena: Easy Medusa clothes/color swap.
PAC-MAN: Ms. PAC-MAN Easy. I feel like people have waited two games to see this one materialize.
Robin: Soren? Christmas Robin from Heroes?
Shulk: You could go with Zeke from XC2 maybe? Or Zanza idk?
Bowser Jr.: No clue.
Duck Hunt: B A N J O
Ryu: Evil Ryu costume.
Ken: Street Fighter V costume.
Cloud: KH would be cool, but Dissidia EX would be a tad more realistic.
Corrin: idk??
Bayonetta: Any of the Nintendo costumes from 2.
Inkling: There’s like an infinite pool of possible Inkling alts. So by default I gotta go with the Spongebob Splatfest t shirt for female and Patrick for male
Ridley: Mecha Ridley.
Simon: Redhead Simon. Not Judgement version tho
Richter: Dracula X Chronicles based design.
K. Rool: Kaptain K. Rool.
Isabelle: Clothes swap with Tom Nook?
Incineroar: T O N Y T H E T I G E R
Piranha Plant: Make the Chain Chomp mod real
Joker: Dancing All Night costume. Yes, DLC for a DLC.