30. Dr. Lawrence Jacoby
With his 3D-style blue-and-red glasses, aging-hippie style, and...unorthodox therapeutic relationships with his patients, the psychiatrist who treated Laura Palmer prior to her murder was an establishing figure for the series' strangeness, as well as a prime suspect in her murder. Dr. Jacoby looked like a goofball but got closer to the heart of Laura's pain than just about anyone else — a perfect illustration of how the show straddled the line between comedy and tragedy. He's the face of mental health in the town of Twin Peaks, which tells you all you need to know.