So that gets me thinking, who would be your preferred partner to some of your most wanted characters if they got in? Whether it’s a character already playable in Smash or an additional newcomer? I’ll start with one of mine that has two solid options for a partner.
Without going into too many spoilers, Jinx has two solid options for a partner if they wanted to add a second character. Vi and Ekko. So Jinx is a glass cannon zoner style character, Vi is an in-your face brawler/boxer like Little Mac and Ekko manipulates time and flies through the air on a hover board. Whether they go with Vi or Ekko, they would each be a great addition to Smash and bring some welcome diversity to the roster. Vi would be our first openly LGBT+ character and Ekko would give us our first non-avatar black character. Both characters are really well written so neither would really feel like forced inclusions just for the sake of it. I think I’d lean towards Vi since her relationship with Jinx was one of the main focuses of Arcane and I like how her playstyle contrasts with Jinx but Ekko could be another great option.
For Adol, the most logical choice would be Dogi he's Adol's only consistent companion. That said, Dana and Karja have both shared main character status in Ys VIII and Ys X respectively, with Ys X especially focusing on the bond between Adol and Karja. Personally, I'd go with Dana, if only because I adore Ys VIII.
For Reimu, if there's anyone else, she's 90% going to be followed by Marisa. The's the
other main character of the series and shows up in everything alongside her. That said, I'm also fond of Sakuya, Remilia, and Junko, even if they're not as consistent in their appearances.
For Chai... Probably Kale? I know "summon your friends to do (X)" movesets are a bit contentious, but a big part of Hi-Fi Rush is Chai summoning his allies to assist in combat and puzzles, so the entire team would would probably be covered that way. The best bet would probably be the final boss (who's a little spoilery),
the main villain Kale. But spoilers aside, he's got a cyborg body, four extra arms, and a laser blade, so he's be pretty damn cool regardless.
For Bandana Dee, definitely Magolor. He shows up the most after BWD, and RtDL DX gave him his own Extra Mode that gives him a little character arc and ties up some of his cameo appearances, and the idea of a floating trickster mage with portals, mines, and energy balls sounds interesting.
For Shadow, Tails is probably up next in the Sonic pipeline afterwards. The kid deserves some action again anyways, he's been on the bleachers since Unleashed. Knuckles is also pretty cool, but Tails is probably coming first.
For Monster Hunter, probably a Palico? All the monsters are cool
except for congalala but very few of them would fit on the stages. Though, I'd be down for some of the NPC Hunters from Rise, like Hinoa, Minoto, or Fiorayne.
And for Miriam, definitely Zangetsu. Coolest boss fight in Bloodstained, best song, and leads the Curse of the Moon spinoffs.