"The Doctor" was the primary alias used by a renegade Time Lord from Gallifrey who traveled through time and space with various companions in their obsolete and "borrowed" Type 40 TARDIS. He has been considered the universe's "greatest defender", having saved the cosmos countless times throughout a long life, becoming a great legend across the whole universe.
Though largely a believer in non-violent conflict resolution, they were, when absolutely necessary, a great warrior. Indeed, some civilizations in the universe translated the word doctor as warrior, whilst others saw the Doctor as a compassionate benefactor, worthy of their admiration and compassion.
From the latter years of their first incarnation onward, the Doctor had a pronounced affinity for Earth and the human race. After departing Gallifrey, they voluntarily chose to spend time on the planet, (TV: An Unearthly Child) and having it chosen as the place of his exile during much of the life of his third incarnation. (TV: Spearhead from Space - The Three Doctors) They favoured Great Britain as a frequently visited location, taking most of their companions from there. (TV: An Unearthly Child, Spearhead from Space, The Time Monster, Trouble In San Francisco, The Castle That Time Forgot , The Scream, etc.) Even after his exile was lifted, the Doctor spent much more time on Earth than on his homeworld.
Though taste in fashion did change with each Doctor, one thing that was an almost constant were jackets, either as part of an outfit (TV: An Unearthly Child, The Power of the Daleks, Spearhead from Space, Castrovalva, The Twin Dilemma, Night Thoughts, The Enemy Within, Night of The Angels ) or an extra like a trench coat. (TV: The Silurian Awakening, Masters of All)
