Albus Dumbledore

Dumbledore was a fictional British character.

Cleo thought Dumbledore was a villain, but the Tenth Doctor told her that Dumbledore was a good guy. (COMIC: The Fountains of Forever)

Behind the scenes

 * Although not specified in the comic, Dumbledore is a character from Harry Potter.
 * Michael Gambon portrayed Dumbledore in the Harry Potter film series beginning from the third movie.