8. Edgar Allan Poe
On October 3, 1849, Edgar Allan Poe showed up on the streets of Baltimore, delirious and in need of medical attention. He died four days later, and never regained coherency to explain his situation. And you know what that means: the Doctor was involved. He got mixed up in some crazy adventure with the Doctor, and he didn't make it. What's more, there's that story about the Poe Toaster -- every year for more than seven decades, a mysterious individual would visit Poe's grave on the anniversary of his death, raise a toast to his memory, and leave three roses in a distinct pattern on his grave. To me, the only conceivable explanation is that the Doctor was wracked with guilt over not being able to save Poe, and returns there every year to honor him. I like the idea of having another dark, morbid artist featured on the show...out of all of the 19th century authors I can think of, Poe would be the one to immediately believe in monsters and aliens. I think seeing something along the lines of what happened in The Unquiet Dead would make him feel really validated in his stylistic choices, and I'd love to see it play out.