She belongs to a middle class London household of that era, and is the daughter of George Darling, a short-tempered and pompous bank/office worker, and his wife, Mary.
However, in the Disney version, her father decides that "it's high time she had a room of her own" out of the nursery for "stuffing the boys' heads with a lot of silly stories", but changes his mind at the end of the film when he returns home with his wife after the party.
She has a distaste for adulthood, acquired partly by the example of it set by her father, whom she loves but fears due to his somewhat violent fits of anger.
Peter and the tribe of Lost Boys who dwell in Neverland want her to be their "mother" (a role they remember only vaguely), a request she tentatively accedes to, performing various domestic tasks for them.
The narrator states that Jane has a daughter, Margaret, who will one day also go to Neverland with Peter Pan, and "in this way, it will go on for ever and ever, so long as children are young and innocent".
[1] Barrie does not give any description of Wendy, but she is generally depicted as a pretty girl with blond or brown hair.
In the 1953 cartoon movie, she makes John and Michael realize that they need their real mother and persuades them to return home after their adventures in Neverland.
In the 2003 film, the feeling is mutual and Wendy shows her love when she gives Peter a hidden kiss in order to save him from Captain Hook.
They also have a special moment in the 2002 cartoon sequel to the 1953 film, Return to Neverland, when Peter and a grown-up Wendy are reunited for the first time in years and they share a final goodbye together.
In Hook, an elderly Wendy hints she still has feelings for Peter (who has grown up and married her granddaughter, Moira), expressing surprise and possibly disappointment that he never stopped her wedding from happening.