Albus Dumbledore

He is characterized as old, benevolent, and powerful. As such he resembles a stereotypical good wizard in the mould of Merlin or Gandalf. He is often sympathetic to Harry Potter's difficulties. He was also the only wizard that Lord Voldemort feared.

In the first two Potter films, Dumbledore was played by Richard Harris. Harris' death meant that a replacement had to be found for the role; according to the Internet Movie Database entry on Harry Potter and the Prisoner of Azkaban (2004), Dumbledore will be played by Michael Gambon in the third film.

See also: Harry Potter and the Philosopher's Stone