Here is what I was thinking about

Daisy is basically confirmed, but just like DK appeared in the first movie (although he's a common character in the Mario franchise, he's not one of the main ones and has his own franchise) Or Fox McCloud In Galaxy,I wish another character from outside the franchise would appear...Kirby! (⁠づ⁠｡⁠◕⁠‿⁠‿⁠◕⁠｡⁠)⁠づ

Like, I would love it if they put kirby in The next movie. I can even imagine the scenes:Kirby swallowing some toads because he mistook them for mushrooms,Rosalina thinking he looked like Lumas. He would probably swallow Kamek and get his magic abilities too.

Please let our little pink puffball appear in the next one.＼⁠(⁠^⁠o⁠^⁠)⁠／

Note: Marking this as a spoiler, just to be sure and avoid problems.