Is there any category for that? i wanted to do a rosalina no powerups speedrun any%.

No, but many people have suggested it, including me.

I'm gonna do a run of it today. You have to beat the levels in the order in which they are shown on the world map. At path splits, just choose 1 level. You can start the run while already having cat suits, and you are allowed to use warp exits. I'm estimating my run to be about an hour, but I'll update this thread once I do it. I'll also do 3d Land.