I'm mostly interested in Cartman ships, but I tend to like whatever has nice dynamics or aesthetics.
My favourite Cartman ships are Kyman (shockingly), Buttman, Scottman and Clyman.
I also really like Nathan, I enjoy see him in many ships but my favourites are maybe with Jimmy and Mimsy.
Other stuff I like on a lesser extent are Stenny, Creek, Heidi x Wendy and adult Bunny.