I have been wondering this for awhile, even though all the boys don't want to admit it (Kenny, Cartman, Kyle, and Stan) they are all close friends with a hate and love relationship. It has also been pointed out obviously that Stan and Kyle are best friends, however in some episodes it has been stated that Kenny and Cartman are best friends as well? What do you think. Because in many episodes Cartman bursts out randomly saying he hates Kenny the most.
Personally I think that these two are the best characters in the show (Well, I am a Kenny Fangirl, but Cartman is my 2nd favorite) with their crude humor, and it seems that Kenny is the only one in the show who finds Cartmans jokes funny and not offensive.
What do you guys think?