Yeah, my most wanteds tend to boil down to "what do I like in video games," regardless of likelihood. Monster Hunter, Shadow, and Bandana Dee have some solid chances, but Reimu has a lot of question marks surrounding her due to Touhou's unique status, Adol has some legacy going for him but is outshone by Trails as Falcom's baby, and Chai... Might be likely in the future?
Actually, I've been meaning to mention-
https://www.gamesindustry.biz/we-do...ehind-kraftons-acquisition-of-tango-gameworks
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In an interview with Krafton, they've stated Tango really wants to bring Hi-Fi Rush to the Switch. Coupled with the datamined Switch-exclusive stuff, it seems like the buyout won't affect Hi-Fi's ability to reach Nintendo systems, especially with the more powerful Switch 2 coming out soon. Krafton's also put some other games like Subnautica on the Switch, but it doesn't seem like there as close as, say, Microsoft or Sega. That said, it seems like they're at least considering the option of Hi-Fi Switch. I could see that eventually leading into Chai in Smash ("Hey, this Hi-Fi's got a ton of goodwill right now, let's get 'em in Smash while we're at it!"), but at the moment it's speculatory.
So in conclusion, Hi-Fi Rush is burgeoning series at the moment, and I think it could have some pretty good Smash potential by the time of Smash 6's DLC cycle, but at the moment that hinges on where Nintendo and Krafton's deals go. Until then, it's up in the air.