18. Agent Albert Rosenfield
When is an a-hole not an a-hole? When he's Agent Albert Rosenfield, of course. The moment this forensic expert shows up on the scene, he causes all sorts of jurisdictional jockeying with his constant barrage of insults aimed at the Twin Peaks PD. Sheriff Truman finally has enough and ends up cold-cocking him; the agent's response is a heartfelt speech about non-violence that earns his enemies' grudging respect and stands as one of the show's funniest, most unique character curveballs.