Tania Bell

Tania Bell was a companion of the Eighth Doctor, member of Torchwood Three and a resident of Baker Street in 2020.

Early life
Tania was transgender, a fact that some people did not like. (AUDIO: Wild Animals) As a child, her father often told her to leave the house for upsetting her mother.

By 2014, Tania moved into Flat 1 at 107 Baker Street. (AUDIO: Lost Property) Her mission, given to her by the Torchwood Institute, was to keep an eye out for the Doctor, who was known to visit the address from time to time. She was in contact with Sergeant Andy Davidson and, unbeknownst to her, had her flat bugged with cameras. (AUDIO: Must-See TV)

The Doctor's arrival
In 2020, Tania finally met the Doctor in his eighth incarnation when he moved in with Helen Sinclair and Liv Chenka, to whom she was attracted. (AUDIO: Lost Property) She was aware that it was too early in his timeline for him to know about Torchwood and, thus, had to keep him from finding out about her affiliation. (AUDIO: Must-See TV)

Tania suggested that something might be exacerbating tensions in the house when arguments and paranoia abounded. Once the Doctor had put a stop to it, she made a telephone call and told Torchwood that the Level 2 activity had been resolved with no further action being necessary. (AUDIO: Lost Property)

Although Liv refused due to a prior experience, Tania offered both Liv and Helen smart phones. Helen asked her to visit Liv in the hospital after she was shot and fell unconscious. Tania asked Liv out for dinner after she woke up and told her that she was transgender, which Liv was unfazed by. (AUDIO: Wild Animals)

Andy visited the house after Tania went somewhat quiet, annoying Tania as the appearance of a police officer made Liv suspicious. She was further irritated to find that Torchwood had bugged her flat and smuggled Andy in to point them out so that she could remove them. She and Liv later agreed to a "no questions, no lies" policy with regards to their secrets. (AUDIO: Must-See TV)

Personality
Tania described herself as nosy (AUDIO: Lost Property) and told the Doctor that she enjoyed shopping whenever she was upset. (AUDIO: Divine Intervention)

Behind the scenes
Tania is the first transgender companion in any Doctor Who media.