http://tvtropes.org/pmwiki/pmwiki.php/Characters/DoctorWhoDoctors

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A Time Lord from the planet Gallifrey, the Doctor (real name unknown) is the main character of this long-running show. Like all Time Lords, they have a life span measured in centuries, some degree of psychic ability, and the ability to regenerate when near death. Unlike other Time Lords, they became bored and/or terrified by the Gallifreyan way of life when they were young, stole an antique TARDIS, skipped town and "never stopped running".

The Doctor remains the same person throughout their lives, but different incarnations have different personalities. Showrunners tend to cast each Doctor as a subversion of the previous one in both attitude and appearance. Hence, the original stubborn old grandfatherly git became clownish, suave, loopy, calm, peremptory, manipulative, romantic, weary, harsh, hyperactive, adorkable, caustic, and plucky. After the show's return in 2005, it's added a bit more Character Development than the classic series.

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In General

All Doctors (General)

Revival series Doctors (General)

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Other Incarnations (Original Series)

The Watcher

The Valeyard

Merlin

Other Incarnations (Revival Series)

The "Meta-Crisis" Tenth Doctor

The Dream Lord

"The Curator"

The Fugitive (Unmarked Series 12 Spoilers)

The Timeless Child (Unmarked Series 12 Spoilers)