I'm late to this but I suppose I'll share my thoughts on the leak list of 7:
Geno: He's kind of interesting for me, since I originally actually didn't really support Geno for Smash. While I've been a fan of SMRPG since I was a child, I used to have the mindset of "hey, I like this game as much as the next guy, but this is still the only game Geno really has to his name...a game from decades ago...". It wasn't until sometime early on in Ultimate's speculation cycle when I decided to put serious thought on how Geno's inclusion could make sense or be fitting, and one thing that I realized is the fact that every Mario rep we have largely reps the platformer side; there wasn't a character that came from the RPG side of things exclusively, which i sactually kind of unfortunate considering how big and beloved that part of Mario is. At that Point geno started to grow on me as far as Smash goes. SMRPG was the first game that started it all, and as far as original characters to that game is concerned, Geno was one of the most important. this new mindset I gained + my love of SMRPG + knowing how long people have wanted the doll in Smash = Geno skyrocketing near the top of my personal wanted list.
Crono: Crono is a character I haven't really supported, partially for the same reason I initially wasn't on the hype train, but also because the dude didn't even have the demand that Geno had and thus never seemed likely to me. that said, if Crono DID make it into Smash, I'd actually be pretty excited for that, especially if we got a good amount of Chrono Trigger music and maybe even some Cross music. Cjhrono Trigger is my favorite game of all time, so seeing it get into Smash would be a hard thing not to get hyped for for me.
Sephiroth: Similar to Crono, I never really hyped him since I never really thought he had a chance, but FFVII is my favorite game in the FF franchise and I do really like Sephiroth as a villain, so I would certainly be down to see him get into Smash. It'd be a great way to get more FF music into Smash (maybe this time we'll get not just 2, but 3 new songs! Whoo boy!)
Erdrick/luminary: I haven't played the games these dudes came from, and haven\t played that much Dragon Quest in my life, so I can't say either of these 2 would do that much for me. I'm largely indifferent to them. That said, seeing Dragon Quest get into Smash would be kinda dope since its such a big and important thing for the JRPG genre. I could appreciate dragon Quest being in Smash in the same way I appreciate Pan-Man being in Smash; neither are franchises I personally don't care about that much, but still kind cool to see Smash getting franchises with so much weight and important under its belt.
Slime: While I'm open to Dragon Quest getting into Smash, I'm not sure how I feel about another mook making the roster. I know its iconic and bigger for DQ than Pirahna Plant is for Mario, but still...
Sora: I've never played a KH game and don't really have any interest to. On top of that, I honestly feel that Sora's original design is pretty Goofy (pun mostly intended). His KHIII design is better IMO, but I don't know if they'd go with that over the original since the original has atleast been on Nintendo systems before through spin-off stuff AFAIK. Overall Either Sora or Slime are the ones I have least interest in.