Drax

Drax was a renegade Time Lord with a knack for tinkering and engineering. He knew the Doctor before either had left their home planet of Gallifrey.

Incarnations of Drax

 * The First Drax knew the First Doctor before either had left their home planet of Gallifrey. (PROSE: Divided Loyalties)
 * The Second Drax had a knack for tinkering and engineering. Unlike other renegades, he had purchased his TARDIS instead of stealing one. (PROSE: Doctor Who and the Armageddon Factor) Upon becoming a renegade, Drax travelled the universe, doing repair and maintenance work as well as committing cons. (TV: The Armageddon Factor)
 * The Third Drax was, much like his predecessor, a renegade Time Lord with a knack for tinkering and engineering. He hatched a con with his various future incarnations, raiding the most secure safe-house in history, using the Fourth Doctor and Romana II as pawns. (AUDIO: The Trouble with Drax)
 * The Fourth Drax was one of Inspector McCormick's "half a dozen best men". As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
 * The Fifth Drax posed as "Rosser", the butler of his twelfth incarnation during a plot hatched by a previous incarnation of his. With the unwitting help of the Doctor and Romana, they raided the most secure safe-house in history. (AUDIO: The Trouble with Drax)
 * The Sixth Drax was one of Inspector McCormick's "half a dozen best men". As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
 * The Seventh Drax was one of Inspector McCormick's "half a dozen best men". As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
 * The Eighth Drax "Inspector Fleur McCormick", a galactic police inspector, during a plot hatched by a previous incarnation of hers. She led a band of her previous and future incarnations who posed as her "half a dozen best men". With the unwitting help of the Doctor and Romana, they raided the most secure safe-house in history. (AUDIO: The Trouble with Drax)
 * The Ninth Drax, under the pseudonym of "Galdron Cabot", pretended to be a criminal-turned-businessman who rivaled Charles Kirkland. At this point, Drax's memories were starting to dim due to age.
 * The Tenth Drax was one of Inspector McCormick's "half a dozen best men". As such, she was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
 * The Eleventh Drax was one of Inspector McCormick's "half a dozen best men". As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
 * The Twelfth Drax posed as "Charles Kirkland", a businessman whose main rival was Galdron Cabot. When he put his disguise aside, he told Romana that he had lost his Cockney accent a few regenerations ago. (AUDIO: The Trouble with Drax)
 * The Thirteenth Drax was one of Inspector McCormick's "half a dozen best men". As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)

Alternate timeline
In an alternate timeline Drax cooperated alongside the Master, the Monk, and the Rani to try to destroy the world using a DNA recombinator, turning the human race into a gestalt consciousness which could be used as a weapon to conquer the universe. (PROSE: The Quantum Archangel)

Psychological profile
Drax showed great technological aptitude. However, he could not grasp temporal theory and failed the class. While Drax could not grasp temporal theory, he had worked out enough about the Blinovitch Limitation effect limiter to know its limitations and also to create an endless paradox from his third incarnation onwards to his thirteenth to possess the device and also commit numerous crimes with two or more of his future lives.

He also showed disrespect towards the Laws of Time. (AUDIO: The Trouble with Drax)

During his ten-year prison stay, Drax picked up Brixton's local accent and idioms, which remained part of his speech patterns after he left Earth and resumed his travels. This cockney accent would last for a number of regenerations, but by the twelfth, it would be gone. When Drax met K9 Mark II and marvelled at the "little tin dog", K9 noted Drax's silliness. Although Drax was not above criminal activity and weapons dealing for personal gain, he displayed a sense of what was morally right and bemoaned having to assist the Shadow in his schemes. He was quick to assure others that he didn't involve himself with armaments on a regular basis. The Doctor talked him round into joining him against the Shadow without much trouble. (TV: The Armageddon Factor, AUDIO: The Trouble with Drax)

Despite some differences, the incarnations of Drax seemed more amiable to one another compared to cases whenever the Doctors met, and despite the dangers of interacting with their own past and future they planned for events that happened in their future, such as having a female incarnation and later reminiscing about the gender switch being worth it. (AUDIO: The Trouble with Drax)

Behind the scenes

 * Although Drax's TARDIS is somewhere around in The Armageddon Factor, only components from it are seen on-screen. The interactive Make Your Own Adventure with Doctor Who book NOTVALID: Search for the Doctor included Drax as a character, and described his TARDIS as taking the shape of a convertible car, the registration plate of which read: "TARDIS".
 * According to NOTVALID: Dalek: Spoof Scenes, in a version of events where the Last Great Time War was fought against the Drashigs rather than the Daleks, the Ninth Doctor cited Drax as one of the people who'd perished in the War, alongside Damon, Spandrell and the Meddling Monk.
 * According to John Dorney, who wrote The Trouble with Drax, the proper plural for describing several incarnations of Drax is "Draxes" (as opposed to "Draxi").