Anya Christina Emmanuella Jenkins, born Aud (formerly Anyanka, the "patron saint of scorned women"), is a fictional character created by Joss Whedon for the cult television series Buffy the Vampire Slayer. The character is portrayed by Emma Caulfield.
Around 1199, Anyanka went to the Koskov valleys above the Urals to curse an unfaithful man. She witnessed a sorcerer's Ascension into pure demon form. The death and carnage — only a few people survived — shocked even her. Around 1580, Anyanka met Dracula, and she was in Salem, Massachusetts, during the witch trials in 1692.
In the 19th century, Anyanka became a close friend and fierce competitor of the vengeance demon known as Halfrek. They spent time together during the Crimean War. Anyanka impressed "Hallie" with a granted wish in Saint Petersburg, Russia, that sparked a revolution in 1905. In 1914, Anyanka traveled to Chicago, Illinois to exact vengeance on a man named Stewart Burns, making him a grotesque creature and sending him to a hell dimension to be tortured for all eternity. This came back to haunt her on her wedding day.
Anyanka arrives at Sunnydale High in 1998 (in the episode "The Wish") as a student named Anya Emerson. Anya seeks to wreak vengeance on Xander Harris for cheating on Cordelia Chase with his best friend Willow Rosenberg - a fateful decision for her and Xander. After some difficulty, she tricks Cordelia into wishing that "Buffy Summers had never come to Sunnydale". In the grim alternate reality that results, The Master has risen and set up shop in The Bronze, with Willow and Xander having been turned into vampires and Oz and Giles leading the failing resistance against them. After meeting with Cordelia, Giles manages to discover what has happened, subsequently summoning Anyanka and destroying her necklace, reasoning that the other reality has to be better than his current one. As a result, Cordelia's wish is undone and Anya is made mortal again.
Caulfield said, "As far as I know, I don't think Joss Whedon ever intended to have Anya around for more than one episode." However, Anya returns in the episode "Doppelgangland"," duping Willow into assisting in a failed magical attempt to recover her power center. Now with human feelings, she yearns to attend the school prom in spite of her abhorrence of all men; her only hope for a date is the last man she was sent to punish. Caulfield says, "[Whedon] found this great way to have her interact with the storylines that had developed throughout the entire [third] season."
Anya develops feelings for Xander and asks him out again just before graduation. Her romantic plans are foiled when he tells her of the Mayor's plan for another Ascension — at the graduation ceremony. Anya decides to flee Sunnydale and invites Xander to join her, saying that when she thinks something might happen to him, she "feel[s] like [she's] gonna vomit". He refuses, citing his "friends on the line." She leaves without him. In the series finale, however, Anya shows how she has developed throughout the seasons as she states that this time, she's sticking around to fight the apocalypse.
Anya frequently reminisces about her life as a vengeance demon, describing graphic punishments and murders she had inflicted in over a millennium, often for misdeeds that most people would not consider to warrant death. Oddly, no one on the series seemed to find this particularly distasteful, even though Anya's position is analogous to that of Spike's after receiving his microchip: she was a murderer who, although incapable of repeating her crimes, was thoroughly unrepentant for them.
Anya becomes a regular in Season Five of the show. While playing The Game of Life, she discovers her love for money and capitalism (as opposed to her belief in Communism during the early 20th century and her charitable attitude of her years as Aud). Anya's budding retail skills encourage Giles to hire her as a cashier at The Magic Box; when he later leaves Sunnydale he becomes a silent partner, leaving Anya to run the shop.
In the Season Five episode "Checkpoint", Anya is questioned by members of the Watchers' Council, and invents the full name Anya Christina Emmanuella Jenkins, claiming to have been born on the fourth of July in Indiana.
During an apocalypse, Xander proposes to Anya and they are engaged for most of Season Six. Xander's doubts grow, however, and it is not difficult for Stewart Burns - escaped from Hell and impersonating Xander's future self - to persuade him to leave Anya at the wedding by showing him an illusionary life where Anya apparently cheated on Xander and was later killed in an argument between the two (cf. "Hell's Bells"). Hurt and angry, Anya becomes a vengeance demon again thanks to D'Hoffryn. She is frustrated when she cannot grant her own wishes against Xander, attempting to trick Buffy, Dawn, Willow and Tara into wishing for her and subsequently sleeping with Spike. In the Season Six finale, Willow destroys The Magic Box, leaving Anya jobless in the mortal world. Anya does not enjoy her new/old work. She spends a summer granting half-hearted wishes and gains a reputation among demons as "Soft Serve".
When asked what direction she would like to see Anya's character go, Emma Caulfield said she hoped that in Season Seven Anya would become "kind of a badass." Caulfield said that Anya has always been strong in unorthodox ways, but "I'd like to see a more blatant display of her strength. Appropriately, after Halfrek encourages Anya to gruesomely murder a group of fraternity members, Anya and Buffy have an evenly matched battle. However, realizing she has lost her taste for the gore of vengeance, she begs D'Hoffryn to return the fraternity members to life. D'Hoffryn agrees, but at the cost of the soul of a vengeance demon. Anya agrees, thinking it means hers, but D'Hoffryn murders Halfrek instead. He turns Anya human once more for her to live in pain, at least until the coming of the First Evil (cf. "Selfless"). D'Hoffryn's words when Anya tells him that he should have killed her suggest that he has foreknowledge of her death in the series finale, replying "be patient, all good things in time" and quoting "From beneath you it devours" (which is often repeated in season 7, referring to The First). However, despite his stated preference of going for "the pain" instead of the kill, D'Hoffryn almost immediately sends at least two demon assassins after her, although they are individually stopped by Buffy and Spike, respectively.
Anya decides that she had been too dependent on others and resolves to find an independent purpose in life for herself. In practice, she rejoins the Scooby Gang and returns to occasional intimacy with Xander; although Xander and Anya still love each other, they never officially resume their relationship.
In the climactic battle against the First Evil (in the episode "Chosen"), Anya is brutally slain from behind, bisected by a Harbinger's sword. Her body lies in the school's remains as the entire, empty town of Sunnydale crumbles into the Hellmouth. Andrew Wells comforts Xander by telling him that Anya had died saving his life, to which Xander replies, "That's my girl, always doing the stupid thing."
In an interview with Buffy The Vampire Slayer/Angel magazine #93, Emma Caulfield stated that she was very pleased with her character's abrupt death, stating, "She didn't get a big, maudlin send-off, it was very quick and to the point - very Anya in that respect."
With over a thousand years of experience as a former vengeance demon, Anya's knowledge of demonology was immense. Although Anya's native language is Old Norse, she spoke fluent, if sometimes stilted, English as well as some French and Latin.
Thanks to her countless years of experience, Anya also exhibits some basic knowledge of magic. She is seen numerous times commenting on Willow's spellcasting and interest in magic with a reasonable degree of insight, and has occasionally participated in the casting of spells herself (cf. "Doppelgangland"). When she was a human, Anya's experience and practice of combat from her times as a demon allowed her to be an effective fighter, as seen in the series finale.
As a side note, Anya states in the "Selfless" flashback that she likes to bowl and she's "good with math" (although, in the episode "Doppelgangland", she says she's failing math).
When rejected sexually (as she is by Spike in "Sleeper" and Torg in "Showtime"), Anya has a tendency to question the effectiveness of her hair. Anya's hair is also the most variable in style and color of any of the main characters, the color seems to change per episode and sometimes, per scene.
A running gag is Anya's brutal honesty and tendency to blurt out inappropriate comments and questions without thinking. This is largely due to her lack of knowledge concerning human social standards. In spite of this, Anya often has good intentions and seems to not understand life and death, breaking down when Joyce Summers dies.
Although she has a phobia towards bunnies, she seems to love monkeys. In the episode "Into the Woods" she tries to convince Dawn and Xander to go and see a movie about a monkey who plays ice hockey and in "Bargaining, Part One", after Willow tells the group she's ready to resurrect Buffy, Anya states, "But Discovery Channel has monkeys! And our tape machine's all wonkey..." Furthermore, in "Once More, With Feeling" Anya says that she and Xander were watching Monkey Trouble when they started singing.