Martha Jones

The Tenth Doctor is cheerful, charismatic, hyperactive and enthusiastic, often at inappropriate time, but would become severely serious when the situation called for it. Striving to make new friends everywhere he went, the Doctor tended to keep a massive smile on his face as he found new ways to enjoy his unpredictable journeys through time and space, with the thought of a mundane existence unnerving him. He can have a merciful and compassionate nature, consistently extending an offer of mercy to help even his most dangerous enemies. However, when his patience reached its limit or his enemies were duplicitous, they received no mercy or second chances.He also held a forgiving philosophy, even forgiving the Saxon Master for his crimes against humanity.

The Tenth Doctor engaged in romantic situations far more frequently than his other incarnations, falling in love with Rose Tyler. However, he found himself unable to explicitly describe these feelings, struggling with saying such things aloud. In the end, it was the Meta-Crisis Tenth Doctor that revealed the Doctor's feelings for her. He also developed a romantic relationship with Madame de Pompadour. Others who wanted to engage him romantically included Martha Jones, Jack Harkness, Astrid Peth, Clare Pope, River Song “his wife”, Christina de Souza, Minnie Hooper, and Elizabeth I. Joan Redfern became romantically involved with his human identity, but viewed the Doctor himself as merely a look-a-like of him.

When he lost anyone who was his friend or lover, he goes in a deep depression and sometimes turns dark. He rather travel alone sometimes.

Many of his relationships with companions were shaped, to one degree or another, by romance; he seemed to genuinely love his first companion, Rose Tyler, as the person who helped heal some of the scars of the Time War, was completely oblivious to Martha Jones' obvious affections toward him, and insisted upon a platonic relationship with Donna Noble. The departure of each of these companions marked periods in his life where he would abstain from having companions at all, and on one occasion he even stopped having adventures or leaving his TARDIS, with little more than a cat for company.

When travelling without companions, the weight of being the last Time Lord became much more pronounced. If prodded too much, he would erupt in an often righteous sense of fury. Indeed, the Tenth Doctor was described by the Moment as "the man who regrets". The fact that he was instantly able to recall the number of Gallifreyan children that he believed were killed at the end the war indicated just how keenly he continually felt those horrendous memories.

The Tenth Doctor travels in a TARDIS which is short for Time and Relative Dimension in Space – an acronym coined by Susan, the Doctor's granddaughter. A Type 40 capsule crafted by the Time Lords, the TARDIS is the Doctor's incredible ship for travelling in time and space. The interior is roundels were replaced with hexaginal shapes. There was a multi-level structure to the console room. The colours were more golden brown with bright cyan highlights on the console. It has many types of rooms, pools and libraries and other cool things inside it. The exterior appearance mimics a police box, an obsolete type of telephone kiosk that was once commonly seen on streets in Britain.

Martha was an intelligent, brave and kind-hearted woman with a great sense of humour. When she was a prisoner of the Daleks, one of them confirmed that she possessed high intelligence. (TV: Daleks in Manhattan) The Doctor was impressed with her theory about having air on the Moon, and he asked her to join him in the hospital balcony to see if they could breathe. (TV: Smith and Jones) She rose to every challenge the Doctor gave her: watching after him while he was human, and walking the world for a year. (TV: Human Nature, Last of the Time Lords)

Martha was willing to accept and defend non-humans as friends. She greeted unusual looking species with wonder and even treated injuries. (TV: Utopia, The Doctor's Daughter) She quickly adapted pattern of speech and gesture to communicate more effectively with other species. (TV: Daleks in Manhattan, The Doctor's Daughter)

Martha quickly developed a crush on the Doctor and always wondered if he even noticed her. Martha was envious of Joan Redfern when the Doctor made himself a human named John Smith and fell in love with her. (TV: Human Nature/The Family of Blood