In lieu of a pun, have some art
This will be stuck in your head now; you're welcome
Chance: 20%
Peanuts is one of the rare big IPs nowadays that isn't owned by, nor has an exclusive licensing deal with, a major media conglomerate. I could bore you with the legalese regarding who owns what stale in the property but basically, Charles Shulz's children are in control of the where and how Peanuts characters are used, and they are adamant that any adaptation stick faithfully to their father's work. In spite of that, they don't hesitate to license out the property often and to many parties (every single one of the big 5 Hollywood studios has dealt with Peanuts at some point).
MultiVersus reportedly isn't limiting itself to just Warner Bros. IP, which makes Peanuts an enticing get for the game. It's one of those brands that have a timeless and universal feel to them, like Hello Kitty. Peanuts would be a big get for MultiVersus, and with Warner Bros. having history with the franchise, it's likely that they could start talks to make it happen.
The main question is whether the Schulz family would consider it on-brand to have a character from their wholesome, nostalgic comic strip duking it out with UI Shaggy and Rick Sanchez. It's not a question I can answer, as it has many factors. Would the violence itself be inappropriate? Peanuts characters sharing the screen with R-rated characters and edgy humor? Charlie Brown being mechanically able to win something? At the end of the day only the Schulzes can decide, and you know what? I trust them to make the call. If they give the go-ahead, it's because and only because they found a way to get it done without being disrespectful of the property; otherwise they'll pull the plug
(and MultiVersus can instead add their new OCs: dog with flying friend and his owner, not!Ness)
If we indulge the hypothetical (and isn't that the entire premise this fine website was founded upon?) then there's one thing left to wonder: who gets chosen? Who is granted the privilege to engage in glorious combat against Steven Universe? The first choice in my mind would be Snoopy, probably assisted by Woodstock. Snoopy's the mascot, to the point where in parts of the world the franchise is named after him. His face is on merch everywhere. He's also got the most moveset potential of any of the characters with his several disguises/personas, especially the Flying Ace; as mentioned before, there's also Woodstock, Snoopy's sidekick and fellow mascot. The smol bird would likely pop up as an assist for various moves. However, if for some reason they don't want to do Snoopy, then maybe protagonist and eternal plaything of the universe Charlie Brown would get the spot instead. The strip and cartoons usually follow him, to the point where Peanuts specials traditionally have him - not Peanuts, not Snoopy - on the name. He's got many iconic running gags (the football kick, his attempts at baseball, the various kites) that rely on physical humor and slapstick, so he provides enough material for a moveset. This might also make him the one character exempt from potential concerns about violence: it's one thing for a young kid or a cute puppy to get the snot kicked out of them, but it's another when ol' Chuck, the kid seemingly destined for failure, is subjected to cartoon violence. Something to think about.
Want: 100%
Do I like Peanuts? I don't know, check my username.
I was introduced to Peanuts through two different, very particular ways. One was through the Poptropica crossover, I played that game religiously as a kid and Peanuts was a great match with its comedy-and-puzzle-centric gameplay. The second, and most relevant, was learning that the Mother games, my favorites of all time, took inspiration from Peanuts' very specific brand of Americana. Add the great artstyle, dialogue, and characters, and I was hooked.
What I'm getting at, besides my love for the property, is that I was introduced to it through and by videogames. From what I understand, it's an American tradition that many Peanuts specials are shown on TV yearly, so people are introduced to them all the time. That's not a thing where I live, and I hazard that it's the same in many other countries around the world. For those territories, there needs to be a way in for people, to actually get into the franchise and characters and not see Peanuts as just cute characters to put on lunchboxes. New specials and series could work, sure, if they weren't on a streaming service that nobody watches (sorry Apple+, but on the bright side, you have maybe the best content of them all?). There needs to be a different way, and if TV and movies won't do the job, why not videogames? They're one of the most popular mediums today, especially with young audiences. So if by some weird miracle we got Peanuts into a game such as MultiVersus, a young boy or girl could be introduced to something wonderful much like I was all those years ago. There's something in that notion that makes me feel all warm and fuzzy inside.
Noms: Stede Bonnet