Look! It's a giant talking egg!
Chance- 20%
Popularity, relevance, importance and move set won't be an issue as long as Sega makes Sonic games. However, a 2nd character in a 3rd party series is unprecedented, so its hard to say whether or not it'll be a toss up between another Sonic character or a 3rd Sega series getting a character. Even then, theres always the matter of other Sonic characters that are equally as popular, like Tails, Knuckles, Shadow etc.
Want- 40%
Multiple characters in one 3rd party series may be a slippery slope for the worst (Inb4 "There's too many Bayonetta characters!" and "Mega Man deserves another rep too!"), and my go to 2nd Sonic character would be good ol Cuckles, but Eggman would be "next in line" if we cant get Knux and I wouldn't despise his inclusion. Being in as much Sonic games as Sonic himself, he was an unforgettable face when I played the Sonic games as a kid and I liked that he always had a new machine to stop Sonic at every turn. He's a villain too, so bonus points.
Jibanyan- 24.33%
Banjo Kazooie X 4
Thwomp X 1