I was playing Paper Jam the other day , when I suddenly thought, what if Mario and Luigi (Or any Mario Series in general) Had another crossover? One idea sprung to mind about a M&L and LOZ crossover, I mean, they are two of nintendos biggest franchises. It's time they combine! I also like the idea of Kirby in a M&L game, though I think Yarn Kirby in Paper Mario would make more sense. I saw a comment on a video once asking for a M&L and Earthbound crossover, and I know the chances of it happening were the chances of Shroobs Flying. But the inner mother fanboy in me just desperatily wanted it. I mean, M&L BIS and Earthbound are my two favourite games. But this is coming from the same guy who wants earthbound amiibo festival, lol.
Idk if we can get crossover like that, Mario & Paper Mario are still within the greater mario series after (and then even it gave AD such a headache that they went full NSMB to ensure it could be completed)
I think Kirby would be the most likely crossover, M&L like to make nods to Kirby series and vice versa (Kirby had a few M&L reference like the Dark Star on the Lor's mast and M&L has some nods like the Kirby poster or the warp star-like attack in DT)
But personally i'd like them to go back to a more traditional M&L for their next installement