Nerys

Nerys was a friend of Donna Noble, with whom she shared a love-hate relationship.

Early life
Nerys first met Donna on their first day of school, during which Donna bit her arm, leaving a mark which Nerys later claimed to still be there, although it was invisible. She believed that Donna always had to be the "centre of attention". (PROSE: Nerys)

Adult life
At some point, according to Donna, Nerys got pregnant with twins using a turkey baster. (TV: The Doctor's Daughter)

In May 2007, Nerys and Donna went on a night out with Mooky Kahari, Veena Brady, and "Mad Alice", where they talked about "all the ghosts [that] turned into robots", which somehow devolved into a discussion about Donna's Spanish scuba-diving holiday.

When Donna got two different job offers - a "posh job" in the city, or a position as a secretary at Capital Copies - Nerys convinced her to "follow [her] dream" and take the city job, primarily because she had her eye on the secretary job herself, which she eventually got, though she came to regret her decision by September. (PROSE: Nerys)

Nerys was a guest at Donna's wedding to Lance Bennett on Christmas Eve, where she witnessed Donna disappear as she walked down the aisle, being transported to the Doctor's TARDIS by the Huon particles in her system, (TV: The Runaway Bride) leaving Nerys, unconvinced by what she had just witnessed, to remark that she had "seen better on YouTube". (PROSE: Nerys) Conversely, Donna believed the event to be some kind of practical joke arranged by Nerys. When Donna finally got to her reception, she was not amused to find Nerys moving in on Lance. (TV: The Runaway Bride)

On Boxing Day, Donna called Nerys to tell her that she was giving up work to go travelling. Nerys told her to let her know when she gets back. (PROSE: Nerys)

Nerys later attended Donna's wedding to Shaun Temple in 2010. Though their relationship appeared to have improved, albeit marginally, (TV: The End of Time) she secretly proclaimed that she would "get her back" for making her wear a peach dress to the ceremony. (PROSE: Nerys)

At some point, Nerys got into some kind of accident, which Shaun told the Fourteenth Doctor was her own fault. (TV: The Star Beast)