Trey Parker and Matt Stone.
Parker is suppossed to be the basis for the character Stan Marsh and Stone is the basis for the character Kyle Broflovski. Typing the characters independantly, Kyle can seem somewhat more on the enfj side a bit and maybe Stan is more intp? Hard to tell with those two. Cartman seems istp, fwiw.
Here's pictures of them;
On another side note, Parker looks surprisingly like Kevin Truedeau.