Assuming Sakurai wants to surprise us with someone bigger or unexpected? What characters do you guys think could possibility top Banjo or at least come close?
Only one I can think of is Geno honestly. I could see Waluigi too him being upgraded from being an assist especially after the outcry over it.
Few others I can think of to is Sora given his popularity and Kingdom Hearts fanbase. Crash Bandicoot as well given his legacy as an iconic gaming mascot back then.
Other then that really can't think of anyone else.
While I consider Banjo & Kazooie to be Nintendo icons,
Crash is a gaming icon overall, so would certainly top Banjo. There's not as much of a "WTF" appeal as a Microsoft-owned character getting in, but is probably known more worldwide.
Sora could also top it, and would be another "WTF" for most people because of Disney, even though, like Microsoft, they'd be more welcoming working with Smash than people think (especially given a representative has already welcomed the idea). Only question mark is we already got a Square Enix character, though this would technically be Disney.
Geno is another grey area, given the Square connection, but more heavily associated with the Mario series. He'd be the character I think would disappoint more casual fans who don't know him, but would be hype for Smash players who've wanted him for so long.
Master Chief would top Banjo, being another gaming icon/mascot, but that would all depend on whether Microsoft got two characters. Not impossible, just unlikely.
I think Waluigi is incredibly unlikely--possible, given the DLC decisions was completed after the Waluigi craze, but it was a loud minority, and would disappoint more people than it would satisfy. Doesn't fit in with the type of characters we've been getting in this pass, and unlike a Three Houses character, wouldn't add anything new, since the character himself, stages and music are already well-represented. He's more of a base game type of character.
All that having been said, it's certainly possible they don't try to "top" Dragon Quest and Banjo-Kazooie. Like the base game, and even moreso given the fighter pass model, they would likely want to get their most marketable characters out first to sell people on the fighter's pass, rather than "save the best for last". I feel like the last character will be a less marketable, but highly requested character from Smash fans.