I personally would want Buzzwole (UB Rep), Ahri, and Hades (KI)
Not to be rude mi amigo, but frankly I don't want anything tied to the game with the most toxic community to be tied to the game with the second most toxic community, aiming for first.
Smash is at least still fun casually with many modes to play and things to do.
Riot keeps cutting all their good **** while, making what they can't cut rotate instead of just leaving it their because Esports, China and money, and at least I don't need a group of 5-10 friends all trying stupid builds and generally not trying just to enjoy myself with Smash.
I've said this many times, but as far as characters I want there really is only Geno. They could put in only indie characters and pull characters straight from Overwatch and Fortnite and I wouldn't care so long as Geno is in the roster.
As for characters I'd like but would still be upset if they got in but Overwatch/Fortnite stuff did too, it's really hard for me to say. I guess Spyro, Goemon and Waluigi in terms of characters I actually personally care about.
As for who I expect, Dante is a topic who seems very plausible, Crash is basically a shoe in and Ryu Hayabusa keeps reappearing as fast as he Ninja Vanishes.