A woman or girl is More Deadly Than the Male. Well, gone are the days where these women are restricted by Men Are Strong, Women Are Pretty and Real Women Don't Wear Dresses. This woman wears dresses (the girlier, the better), loves pink, flowers, and shoes, keeps cuddly things around, is image-conscious, Thinks Like a Romance Novel... and is out for blood.
Unlike her sisters the Girly Bruiser or the Lady of War, this woman is an invariably dark character, usually a Psychopathic Womanchild. She lacks scruples. For this reason, the trope mostly applies to female villains, although the odd very dark Anti-Hero or Anti-Villain may be found somewhere. If she's a supervillain, she might have Super Cute Superpowers such as a Heart Beatdown. She may be genuinely Affably Evil or a heroic character who is driven to commit cruelty. Whatever their stated goal, they will get down and dirty in fighting; they can be a Dark Action Girl, but they don't need to be. They'll kill. A simple Alpha Bitch doesn't qualify here, but a particularly clever, violent, or manipulative one might. They use their girlishness and/or traditional femininity to disarm those around them, but their femininity isn't a façade. It will often increase, rather than disappear, when they are committing murderous or evil acts. Their favorite tactics will be Wounded Gazelle Gambit and Obfuscating Stupidity. Some examples are Silk Hiding Steel, but in general, most of the examples here are more like pink fur/velvet covered in steel. Also, they usually don't hide their cores of steel very well - at least, not to the audience. Whatever girlish hallmarks around them will soon appear very sinister.
A Sister Trope to Sugary Malice, although this extends to costume, appearances, and props, and is specifically feminine. Also, these characters are defined by being dangerous - not merely malicious. This woman uses Womanliness as Pathos.
Soundtrack Dissonance follows them around, as they'll usually be big fans of pop (especially boy bands), Retail Therapy, and other traditionally feminine media such as the Chick Flick. But they will also be ready to fight, to stalk, and to plot revenge. If there's a particular sinister scene of them smearing makeup over their face, it can almost be guaranteed that they qualify. When they're not wearing pink, they might be seen in an Ethereal White Dress, but whatever they wear, they follow Light Is Not Good and Bright Is Not Good.
They also have equally uncomfortable relationships to being Ms. Fanservice and Cute But Psycho. There will always be an effort to look cute, but how successful it is depends on individual portrayals. If they are a yandere - one of the more common types, although not all of them are - they will often use Distracted by the Sexy intentionally. However, it's just common for these women to try and perfect a highly sexualized image to such a degree that it's actually portrayed as downright scary and Fan Disservice. Some portrayals will exploit this to suggest that Makeup Is Evil or Vanity Is Feminine.
- In Kill la Kill, Nui Harime is the Grand Courtier of REVOCS and an out of control, psychotic Dragon to the main villain. A Kawaiiko dressed in a frilly pink dress and Girlish Pigtails, she dances and giggles around the battlefield while murdering people and presenting one of the most formidable challenges to the heroes. She also murdered Ryuko's father, which she gleefully gloats about.
- In this infamous fanfic Cupcakes, Pinkie Pie is a serial killer and cannibal who not only uses pieces of her victims in her cupcake recipe but also takes cutie marks, pegasus wings and unicorn horns and adds them to the dress she wears when torturing somebody.
- Audition: Asami appears to be the perfect woman: a soft-spoken, badly abused ballet dancer who always wears white and just wants to be loved. However, if she senses she has any competition - regardless of what it is - she will drug, torture, and slowly, sadistically dismember them...while retaining her soft voice and childlike manner.
- Invoked in Black Swan. Nina sees Lily like this for being overly sexual and liberated, and begins to imagine that Lily is out to sabotage the more traditional 'good girl' Nina. But played with. Lily never seemed to have any particular ill will towards Nina and it was Nina herself who ended up losing her mind and stabbing herself, not attacking or harming Lily in any way.
- Gone Girl: Amy wears a lot of angelic white, uses fluffy gel pens, a master of the False Rape Accusation, and is a huge fan of Jane Austen and love stories. She's also plotting to frame her husband for her own murder, and gets dressed up in a lacy slip in order to murder her ex-boyfriend while they have sex.
- The "insane" Jackie in The House of Yes permanently dresses as Jackie Kennedy in the famous pink suit and forces people to call her Jackie-O, while trying to persuade her twin brother to restart their sexual relationship, despite him being engaged to Leslie and eventually kills him rather than let him leave her.
- Lola in The Loved Ones is Daddy's Little Villain: an insane yandere in a bright pink dress whose overly-invested father makes a "prom" for her every year where they kidnap a teenage guy, torture him, and force him to go along with their sadistic games before drilling a hole in his head and locking him in their basement to be tortured even more and starve.
- Adopted daughter Esther in Orphan is a Deliberately Cute Child in little Victorian dresses and pigtails - and she's also a grown woman who's plotting to massacre her new family so she can have the father all to herself.
- Played with in Midsommar. Dani is a makeup-free tomboy for most of the film, but her Girliness Upgrade including wearing a huge floral dress marks her induction into a murderous cult and agreement for Christian to be ritually sacrificed.
- A rare Anti-Hero version: Cassie in Promising Young Woman always wears highly feminine clothes (always pink or another bright color) and lots of makeup, while she's pretending to be drunk so that men will take her home and she can punish them for trying to rape her. And she's trying to get revenge on the people who drove her best friend to suicide, even if that means making an ex-friend think she was raped and pretending to set a teenage girl up to be raped.
- Stoker: India Stoker is a solitary teenage girl who always wears old fashioned dresses or modest shirt-skirt combinations, often in silk, is attracted to her murderous uncle, and stabs her would-be rapist with a pencil when he tries to attack her. She also kills her uncle Charlie and the film ends with her accepting the family creed of murder and killing a police officer, while dressed in the same way.
- Dolores Umbridge of Harry Potter is fond of wearing pink clothes and an Alice band in her hair. She also loves making pupils write lines with their own blood and persecute hybrids and Muggle-borns.
- Gillian Flynn is a big fan of this trope:
- Kristi in Dark Places is a more sympathetic version. She was an extremely cute, gossipy, peak-80s tween when she tried to seduce Ben (who was eighteen), and then falsely accused him of sexual abuse, getting him sent to prison. When Libby catches up with her, she's a stripper with a terrible breast enlargement who, while she admits to lying about Ben, still expects Libby to feel sorry for her.
- Gone Girl: Amy has always played the role of a specific form of Girly Girl for her boyfriends and even her friends. Desi in particular is a huge fan of her always dressing in pastel shades and she falsely accuses both Nick and her own father of brutal physical and sexual abuse to get sympathy and attention from him. Nick's version of Amy is cooler, more hipster, and "modern" but still girly in a way that appeals to Nick (hairless, sexy).
- Amma and Adora in Sharp Objects are both generation-specific versions. Evil Matriarch Adora is The Münchausen and enjoys making all her daughters sick and being viewed as the perfect mother even if it meant killing her youngest, Marion. Amma, on the other hand, is viewed as an innocent little girl while murdering rivals for her mother's and Camille's attention and putting their teeth in her Creepy Dollhouse.
- In The Hunger Games and the film, all of the female winners seen - especially Johanna and Katniss - are tomboys. However, although she appears to be a Faux Action Girl judging by how she can't use a bow and arrow, Glimmer is the District One tribute and she is blonde, bouncy, and is either completely naked or wears a fluffy pink dress for her public displays before the Games. Judging from Katniss's reactions, this is a very common image for a Tribute.
- Jill Wolcott in the Wayward Children series wears elaborate frilly dresses, strives to behave like a refined lady, and is willing to deceive and kill without compunction to get what she wants. She spent her adolescent years as the adopted daughter of a vampire lord and adopted both the ladylike mannerisms and the ruthless amorality to please him.
- Serena Joy in The Handmaid's Tale, especially the flashbacks but coming out more after she left Gilead. She was one of Gilead's main architects and their impeccably dressed public face before the Sons of Jacob took over, and could be found espousing sexist rhetoric while wanting to be treated differently. Her motif is a ballerina (although she herself doesn't do ballet). her hair is always perfectly curled, and she wears pink and white.
- Fargo Season Four: Subverted by Zelmare Roulette and Swanee Capps, two Ax-Crazy outlaw lovers. Swanee dresses in masculine cowboy clothes while Zelmare is the more feminine one in a dress and fur coat; however, over the season her clothes get progressively rattier as she has no interest in maintaining them. In one episode they enter an enemy house disguised as prostitutes, but since neither is particularly good at playing feminine they start shooting up the place immediately.
- Law & Order: Special Victims Unit: the evil trio of teenage girls in 'Mean.' They torture everybody in their school and then when the Alpha Bitch senses a rival for her (adult) boyfriend, they kidnap and physically torture their own friend before setting her on fire to kill her. They even take her rings and wear them in court.
- Villanelle in Killing Eve. A highly trained assassin, she is also a huge Francophile, has an extremely feminine dress sense, including wearing couture gowns to her therapy sessions, and she's a psychopath with almost no empathy who enjoys killing people.
- Angelica Bain, the killer of "The Mermaids Singing", in Wire in the Blood who is a pre-op transwoman and regarded uncritically as a Creepy Crossdresser and Depraved Homosexual. Everything in her house is horrifically pink, she wears lots of makeup and dresses in extreme fetish wear. Then she seduces men by posing as an erotic caller, and savagely tortures them to death.
- Genshin Impact: The Fatui Agents are one of the enemies the player has to defeat along with the Hilichurls, Treasure Hoarders and Abyss Mages. They're mostly males and very tough, but the female ones (the Cicin Mages) are very feminine in comparison and so dangerous and tough to beat as their male counterparts. There're two types of Cicin Mages that are differentiated for the elements and colors (Electro/purple and Cryo/light blue), but both of them wear spandex clothes, fur coats with big hoods with bunny ears, being the Ms. Fanservice of all enemies of the game.
- In the Hitman: Blood Money level "You Better Watch Out", a woman wearing a Sexy Santa Dress can kill 47 if he doesn't take care of her beforehand.
- No More Heroes: Bad Girl is a young woman who wears a pink frilly dress and high heels. She's also an Ax-Crazy maniac who beats people to death with a baseball bat.
- Phoenix Wright: Ace Attorney: Dahlia Hawthorne is a delicate-looking and very feminine young woman (she wears a pink dress and a matching parasol and summons pink butterflies as a sign of her purity. She's actually a serial murderer and master manipulator who uses her feminine charms and skill at poison to commit crimes.
- Helen Narbon of Narbonic is a super-girly Mad Scientist. She is heavily associated with the color pink and heart icons, wear pink glasses and loves cutesy things like kittens and gerbils- particularly when she's able to mutate them into adorable abominations of mad science to take over the world and destroy her enemies.
- DC Super Hero Girls 2019: Carol Ferris/Star Sapphire is a cheerleader with a love of romance and the color pink, has a supervillain outfit that consists of a frilly pink dress and a tiara, and has love-based powers that manifest in hearts and purple constructs. She's also a Psycho Ex-Girlfriend to Hal who is hellbent on getting revenge on him and murdering anyone who she thinks he might be dating.
- Foster's Home for Imaginary Friends: Nemesis is a supervillainess imaginary friend based around femininity to contrast with Imaginary Man's masculinity. As such, she has a motif of hearts, flowers (which are Imaginary Man's weakness), and the color pink, and her crimes revolve around forcing a feminine touch on traditionally masculine settings through vandalism. Subverted in that she's a Jerk with a Heart of Gold engaged in a friendly Sibling Rivalry.