Rosalina, obviously.
Rosalina is leading. You disappoint me gaf.
I was going to pick Shy Guy because why the fuck not but the sheer terror on this kids face in that gif has made me a believer in DK.
All this Rosalina love convinces me that the next Paper Mario game should absolutely feature Lumas. Shady lumas that deal star bits in back alleys. That'd be pretty in-line with the Paper Mario universe.