@Luca H.
I can kinda live without Waluigi for one game honestly.
I kinda miss Diddy Kong actually. Oddly, Hot Wheels released a Mario Kart toy kart of him, even though he hasn’t been in MK for decades.
Funky Kong was fun too.
Honestly, I’d like E.Gadd, Captain Syrup, (or Ashley, the Wario series needs more reps) or Foreman Spike (hey, the movie is reviving him, so he’ll have an official 3D model now) as my most wanted Kart characters.
I suspect the crossover characters will be removed from the next one, considering “New Horizons” removed every crossover Nintendo items, but the Mario ones. (My only gripe with that game.)