I'd say that it is reasonable to assume that most of the P&P fic out there was largely inspired by this BBC production, commonly referred to as P&P2. So, those are the faces I'll put with the characters. Get ready, 'cause there's quite a few.
(Most of the following information I took from http://www.sparknotes.com/lit/pride/characters.html. Character photos are from the BBC's 1995 production.)
Miss Elizabeth Bennet
The novel's protagonist. The second daughter of Mr. Bennet form Hertfordshire, Elizabeth (aged 20), or "Lizzy" as her family calls her, is the most intelligent and sensible of the five Bennet sisters. She is well read and quick-witted, with a tongue that occasionally proves too sharp for her own good. Her realization of Darcy's essential goodness eventually triumphs over her initial prejudice against him.
Mr. Fitzwilliam Darcy
A wealthy gentleman from Derbyshire (aged 28), the master of Pemberley , and the nephew of Lady Catherine de Bourgh. Though Darcy is intelligent and honest, his excess of pride causes him to look down on his social inferiors. Over the course of the novel, he tempers his class-consciousness and learns to admire and love Elizabeth for her strong character. (In fan fiction, his pride is often explained by his intense shyness.)
Miss Jane Bennet
The eldest and most beautiful Bennet sister. Jane is more reserved and gentler than Elizabeth. The easy pleasantness with which she and Bingley interact contrasts starkly with the mutual distaste that marks the (initial) encounters between Elizabeth and Darcy. (She is Elizabeth's most beloved sister and closest confidant.)
Mr. Charles Bingley
Darcy's considerably wealthy best friend. Bingley's purchase of Netherfield, an estate near the Bennets, serves as the impetus for the novel. He is a genial, well-intentioned gentleman, whose easy-going nature contrasts with Darcy's initially discourteous demeanor. He is blissfully uncaring about class differences. (He is easily swayed by the opinions of his haughty sisters as well as those of Darcy.)
Miss Lydia Bennet
The youngest Bennet sister (aged 15), she is gossipy, immature, and self-involved. Unlike Elizabeth, Lydia flings herself headlong into romance and ends up running off with Wickham.
Mr. George Wickham
A handsome, fortune-hunting militia officer. Wickham's good looks and charm attract Elizabeth initially, but Darcy's revelation about Wickham's disreputable past clues her in to his true nature and simultaneously draws her closer to Darcy. (He is the son of the late Mr. Darcy's steward. The late Mr. Darcy took care of him after his own father's death. He grew up at Pemberley with Darcy.)
The patriarch of the Bennet family, a gentleman of modest income with five unmarried daughters. Mr. Bennet has a sarcastic, cynical sense of humor that he uses to purposefully irritate his wife. Though he loves his daughters (Elizabeth in particular), he often fails as a parent, preferring to withdraw from the never-ending marriage concerns of the women around him rather than offer help. (His estate, Longbourn, is entailed to his nephew, Mr. William Collins, upon his death and so, his daughters will not inherit it.)
Mr. Bennet's wife, a foolish, noisy woman whose only goal in life is to see her daughters married. Because of her low breeding and often unbecoming behavior, Mrs. Bennet often repels the very suitors whom she tries to attract for her daughters. (She spends most of her time gossiping with her sister, Mrs. Philips.)
Miss Mary Bennet
The middle Bennet sister, bookish and pedantic. (She is the only one who seems to be fond of Mr. Collins! She spends most of her time practicing the pianoforte and quoting from Fordyce's Sermons.)
Miss Kitty Bennet
The fourth Bennet sister. Like Lydia, she is girlishly enthralled with the soldiers.
Miss Caroline Bingley
Bingleys snobbish sister. Miss Bingley bears inordinate disdain for Elizabeth's middle-class background. Her vain attempts to garner Darcy's attention cause Darcy to admire Elizabeth's self-possessed character even more. (Since both she and her brother are unmarried, and their parents are dead, she "keeps house" for Charles.)
Mrs. Louisa Hurst
Bingley's other sister. Her and her husband, Mr. Hurst tag along with Bingley and Caroline wherever they go. She is much like her sister in temperament. Her husband mainly just sits around and eats, sleeps, and occasionally can be roused to hunt.
Miss Georgiana Darcy
Darcy's sister. She is immensely pretty and just as shy. She has great skill at playing the pianoforte. (She is more than 10 years younger than Darcy and she has had an unfortunate experience with Wickham.)
Lady Catherine de Bourgh
A rich, bossy noblewoman; Mr. Collins's patron and Darcy's aunt. Lady Catherine epitomizes class snobbery, especially in her attempts to order the middle-class Elizabeth away from her well-bred nephew.
Miss Anne de Bourgh
Lady Catherine's daughter, who, unlike the Bennet daughters, will inherit her family home upon the death of her mother. She is very sickly. Lady Catherine is convinced that she will be able to bring about a marriage between Anne and Darcy and insists that they are already engaged. (Anne is one of a handful of lesser characters in the book that sometimes gets much meatier roles in fan fic. She is often paired with Col. Fitzwilliam and is often much stronger, in mind and will, if not in health, than she is in the novel.)
Colonel Richard Fitzwilliam
Darcy's cousin and co-guardian of Gerogiana since the death of the Darcy's parents. He accompanies Darcy to visit their aunt, Lady Catherine de Bourgh. (In fan fiction, is sometimes is portrayed as having a crush on Elizabeth. He also often used as a foil for Darcy, in that he is easy-going and gets along well with strangers, where Darcy is reserved, shy, and sometimes haughty. However, the cousins are almost always portrayed as the very best and closest of friends.)
Mr. and Mrs. Gardiner
Mrs. Bennet's brother and his wife. The Gardiners, caring, nurturing, and full of common sense, often prove to be better parents to the Bennet daughters than Mr. Bennet and his wife. (Mr. Gardiner works in trade in London. In fan fic, the relationship the Gardiner's share is often a model on which Darcy and Elizabeth try to base their own.)
Mr. William Collins
A pompous, generally idiotic clergyman who stands to inherit Mr. Bennet's property. Mr. Collins's own social status is nothing to brag about, but he takes great pains to let everyone and anyone know that Lady Catherine de Bourgh serves as his patroness. He is the worst combination of snobbish and obsequious. (But, my, oh my, does he provide some hilarious comedic moments!)
Miss Charlotte Lucas
Elizabeth's dear friend. Pragmatic where Elizabeth is romantic, and also six years older than Elizabeth, Charlotte does not view love as the most vital component of a marriage. She is more interested in having a comfortable home. Thus, when Mr. Collins proposes (after Elizabeth has turned him down), she accepts.
Sir William Lucas
Charlotte and Maria's father. He is a jovial and well-meaning gentleman of Hertfordshire. In the beginning of the saga, he hosts a couple of parties which are the setting for Elizabeth and Darcy's first meetings. He also accompanies Maria and Elizabeth into Kent to visit Charlotte and Mr. Collins.
Charlotte's younger sister. She is around the same age as Kitty and Lydia Bennet.
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