Narcissa is descended from the Ancient and Noble House of Black, one of the 17 Roman magical families that relocated to Wizarding Britain after the fall of Rome, and one that has been a part of the Wizengamot since its inception. The Black Family has been noted to produce lots of witches and wizards capable in Shape Shifting Magic.
Narcissa was an early supporter of Voldemort, becoming a Death Eater before she even graduated Hogwarts, back when the group were called the Knights of Walpurgis. She believed in her cause so strongly that she even gifted her own sister, Bellatrix Black, then an aspiring auror who disapproved of Narcissa's more radical Pureblood ideology, a cursed book on Occlumency. This book then possessed Bellatrix, transforming her into a Death Eater and Voldemort's assassin. As a graduation present, her parents' gave her a gift for passing all her NEWTs; a potion made from the organs of a Veela, imbuing her with an artificial Veela Aura.
When Aurors arrested Sirius Black, Narcissa seduced Herbert Cattermole, a ministry official who has access to seals of deceased Wizengamot Judges. She convinced him to forge a transcript for Sirius' trial (marking it with three seals to "authenticate" it), where Sirius confessed to being a Death Eater and exonerated several high-value Death Eaters, including Lucius. Once done, she travelled to the Caribbean, using the monikor Ariana McFlossy, with her "lover" until she got confirmation about her success. She then killed Cattermole with the Killing Curse and travelled back to England, with no-one the wiser.
Book 2 - The Secret Enemy
Due to a letter she received from her son, Draco Malfoy, half-way through Draco's first year telling her he'll never reach her expectations whilst Harry Potter is alive, Narcissa begins scheming with Peter Pettigrew in an attempt to kill Harry. This results in her making several attempts on Harry's life, with the most notable being attacked by a Doxie swarm and having her House Elf, Mogli, enchant a Bludger to grow spikes and chase Harry during a Quidditch match.
However, Lucius has his own plans this year; sending one of Voldemort's Horcruxes to Hogwarts with Ginny Weasley in an attempt to derail her father's Muggle Protection Act. However, his plan goes arwr since the Hogwarts Wards were deactivated the previous year, causing the Diary to run wild and start petrifying students.
After Draco is petrified, the marriage between Lucius and Narcissa falls apart due to strain. Lucius (unaware of his roll in the petrification) implies that he initially suspects Narcissa of being involved, suggesting her method of parenting might not have been the most pleasant. The pair eventually file for divorce, a move almost unheard of among Pureblood wizards. During the divorce, both offer to house Draco. Due to Lucius' increased role in Draco's political education that year, Draco chooses Lucius. This leads Narcissa to effectively disown Draco, stating "she can always have more sons".
She later sends Mogli to derail the Hogwarts Express in one last attempt on Harry's life, as well as kill Draco. This attempt is foiled by Dobby, however, who slays the elf before anyone is ever the wiser.
Book 3 - The Death Eater Menace
She visits a Muggle who turns out to be Barty Crouch Jr. who is hiding inside a false persona using Occlumency. She wakes him from this self-induced amnesia and recruits him for a project, along with Tiberius Nott, who she manipulates with her Allure. This project is likely the resurrection of Lord Voldemort, as the pair "kidnap" a pregnant witch, with the promise that her child will be "the most important child in the world".
Narcissa is described as stunningly beautiful and young-looking for her age; a fact that can be attributed to the Veela Allure she acquired after Hogwarts.
Personality & Traits
She is narcissistic and manipulative.
Magical Abilities & Skills
Narcissa is known to produce an artificial Veela Allure. This is the effect of a potion containing the organs of a Veela she drank. The potion was a gift from her parents for passing all of her NEWTs. She has since utilised this Aura to great effect; pressuring her husband into becoming a Death Eater, seducing a Ministry Official into forging false trial transcripts, and manipulating Tiberius Nott to allow her access to his wealth.
Behind the Scenes
- Narcissa Malfoy is played by Charlize Theron
Canon-Narcissa is a Pureblood bigot who is quite fine with supporting violence behind the scenes. While she was quite happy to support Voldemort via supplies and finances, as well as voice her support for his politics, she left the more violent aspects of Voldemort's campaign to her husband. It is even hinted that she was not a Death Eater, just a supporter, as she did not appear alongside her husband upon Voldemort's rebirth. She is also fiercly loyal and protective of her family, Draco in particular. She goes so far as to pressure Severus Snape into making an Unbreakable Vow to protect Draco in the sixth book and lying to Voldemort about Harry's demise in the seventh.
POS-Narcissa is very different to her Canon counterpart. She displays no aversion to violence and killing, as we see her casually kill a Muggle who complained about her loud 'nighttime activities' as well as discover her role in the murder of a Ministry functionary right after the end of the First Wizarding War.
POS-Narcissa is the Voldemort supporter of the Malfoy household, holding almost no loyalty to her family. In fact, Lucius' own support to Voldemort is revealed to come only under some form of duress, which is likely Narcissa's Veela Allure. When Lucius turns on Voldemort due to the reveal of his Horcruxes, Narcissa divorces him, taking 75% of Malfoy's wealth with her. Even her relationship with Draco is different, with POS-Narcissa only viewing Draco as a tool to further her own agenda. Once Draco disobeys her and moves in with his father, Narcissa washes her hands of him with no hesitation, later attempting to have him killed alongside Harry.