6. Dr. Douglas "Doogie" Howser, "Doogie Howser, M.D."
What’s crazier: a doctor who fights supernatural island spirits, or a doctor who’s only 16 years old? Well, we know what’s cuter. Dr. Douglas “Doogie” Howser (Neil Patrick Harris) is a child genius who graduates high school at 9, college at 10, and med school at fourteen. At 16, Howser not only has to deal with the medical profession, but also the profession of being, in many ways, an ordinary teenage boy.