An all-women team of crimefighters.
Appearances: Birds of Prey
- "He's after all of us. He's sure as hell after me, I just robbed him. You just betrayed him. You just killed his BFF. And you're dumb enough to be building a case against him. So, unless we all wanna die very unpleasant deaths and let Roman go finger-fishing in the kid's intestinal tract, we're gonna have to work together."—Harley Quinn
A team of female asskickers originally formed to have a chance to stand against Black Mask. It later evolves into a vigilante team.
- Action Girl: All of them are combat-capable except Cassandra Cain (who doesn't join the formally established roster at the end anyway).
- Amazon Brigade: A team composed entirely of women, as in the source material.
- Beauty, Brains, and Brawn: The Chanteuse and object of Roman's affections Dinah Lance (Beauty), hard-boiled detective with an almost clairvoyant ability to decipher clues Renee Montoya (Brains) and professional killer with a Hair-Trigger Temper Helena Bertinelli (Brawn).
- Costume Evolution: Huntress and Black Canary get costume upgrades in the epilogue that are more comic-accurate.
- Fire-Forged Friends: They're all pitted against each other for the majority of the film, but immediately put it all aside as they've all got a reason to team up against Sionis.
- Guest-Star Party Member: It turns out Harley Quinn and Cassandra Cain are not part of the team proper when it is established at the end of the film. They do participate in the genesis of the team during the Final Battle (Harley more than Cassie), but they depart after it, and Black Canary, Huntress and Renee Montoya formally establish the team afterwards, name and all.
- Origin Story: The Birds of Prey film is this for the team.
- Power Trio: When it is formally established at the end of the film, the team is composed of Black Canary, Huntress and Renee Montoya.
- Primary-Color Champion: Before they formally establish the team and don different outfits, Dinah Lance wears yellow, Huntress wears violet, Renee Montoya wears blue, and their Protectorate Cassandra Cain wears red.
- Protectorate: In the latter half of the movie, the eventual crime-fighting team Birds of Prey plus Harley Quinn band together to protect little Cass from Black Mask and his many mooks.
- Ragtag Bunch of Misfits: A vigilante, a driver for a mob boss, and an ex-detective teaming with an crazed ex-therapist and a young pickpocketer.
- Vigilante Militia: A team of female vigilantes that's formed to fight crime in Gotham City.
- Vitriolic Best Buds: They enjoy making fun of each other's character flaws.
Affiliation(s): Black Mask's Gang | Birds of Prey
Played by: Jurnee Smollett
Appearances: Birds of Prey | Black Canary
A nightclub singer who gets recruited by Roman Sionis as his driver. She utilizes advanced martial arts, and inherited her signature Canary Cry from her mother.
- Absolute Cleavage: Dinah wears a low neckline when she first teams up with Harley and the other Birds.
- Adaptational Angst Upgrade: In the comics, her mom lives to see her through to adulthood, and Dinah was excited to follow in her footsteps by becoming a superhero. Here, her mother was killed brutally in the street and Dinah grew up jaded and cynical. Though they had their problems, it was her mother who looked at her past vigilantism scornfully, not Dinah Jr.
- Adaptational Modesty: Zigzagged. Dinah's outfits don't bare her legs like they do in the comics, but her initial outfit does show off her midriff.
- Adaptational Wimp:
- Dinah's a strong fighter, but her abilities are visibly less impressive; compared to Huntress and Harley, who both make use of flashy acrobatics or Combat Pragmatism, Dinah stays pretty grounded and seems to fight with strong but relatively limited kick-boxing moves, making Dinah seem the least-trained of the three, seemingly from being a street fighter. For reference, her comic self is considered one of the top fighters in the DCU, behind only Lady Shiva, Cassandra Cain, Connor Hawke, Batman, and Richard Dragon.
- The Canary Cry is about as powerful as it is in the comics, utterly laying out an entire army, but it appears its something that will render her unconscious after usage, a limit she's never had in the comics.
- Adaptational Villainy: Downplayed, she's far from a malicious person, but this take on Dinah has no interest in heroism or working with the GCPD, and has no qualms about working for Black Mask. In the comics, even at her lowest, Dinah would never tolerate working for someone as depraved as Sionis. Her Refusal of the Call is taken to an extreme as she's reluctant to help anyone; twice, Dinah even witnesses an obvious sexual assault happening, and hesitates to intervene, which as well is something her comic self would never have done.
- Addiction Displacement: She seems to be attempting to quit smoking. When she first meets Harley, she has a cigarette tucked behind her ear. A close up of her arm shows she's using nicotine patches.
- Affectionate Nickname: Sionis and Zsaz calls her "Little Bird". Dinah does not like this nickname, but can't talk back.
- Alternate Self: Has two on Earth-Prime, one on Earth-167 and one on Earth-203.
- An Offer You Can't Refuse: She gets the dubious "honor" of being promoted to Sionis' personal driver after he witnesses her combat abilities (that she kept hidden for years for a reason), on these grounds. She tries to politely decline a few times but he insists, making it clear that if she seriously said "no" she'd risk angering him, and possibly losing her face.
- Awesome, but Impractical: Her Canary Cry is extremely powerful, able to shatter glass easily and immobilize multiple opponents at once but is also harmful to her allies, is hard to use in a close quarters fight and it drains her energy so much she passes out after using it. As such, she only uses it once in the finale and uses her fighting skills the rest of the time.
- Batter Up!: At the Amusement Mile, Harley lends Dinah her bat, which she utilizes pretty well.
- Beneath Notice: Spent years avoiding getting sucked into Black Mask's crime schemes by pretending to be "just another pretty face and set of lungs." All that flew out the window the second Sionis and Zsasz saw how well she could fight, and they needed another driver since Harley Quinn broke his driver's legs...
- Big Sister Instinct: She tries to look out for Cassandra however she can. Whether that's comforting her while her foster parents are yelling, giving her money to buy food, or trying to make sure people like Renee can get to her in time before Black Mask does.
- Blaxploitation: The changes to her costume seem to evoke this, with her largely wearing 70s-style jeans, tiny tank-tops, and bodysuits, rather than anything resembling her comic book costume. She eventually upgrades to something slightly more comic-accurate.
- Broken Bird: Losing her mother young and being shuffled from foster home to foster home has left her with a very bitter outlook on life, and she tries to stay out of most conflicts, collect her check as a night club singer and bounce. Over the course of the film, her fondness for Cassandra, and increased inability to turn a blind eye to Sionis' horrible deeds helps her open up and protect others like her mother did.
- Bystander Syndrome: At the start of the film, she tries to stay out of most conflicts and look out only for herself, but even she can't bring herself to allow Harley to get kidnapped by some creeps when she's too drunk to defend herself, or allow Sionis to cut up Cassandra Cain.
- By the Hair: The movie goes out its way to avert this; her long hair gets in face more often than not when she's fighting, so during the Amusement Mile fight, Harley offers her a hair tie.
- The Chanteuse: Her first job before she's hired as Black Mask's driver.
- Dark-Skinned Blond: She's played by the biracial Jurnee Smollett and has bleached hair.
- Deadpan Snarker: She makes a lot of quips, especially if Harley is involved.Harley: Hey, you're that singer no one listens to!
Dinah: Hey, you're that asshole no one likes!
- Delinquent Hair: Dinah has bleached blonde hair that she styles into cornrows along the side of her head. In keeping with her delinquent status, she lives in the slums of Gotham, has a distrust of authority and took a job from a known crime boss because she needed the income.
- Does Not Know Her Own Strength: Her sonic scream is powerful enough to lure people and shatter glass, and her Canary Cry is a sight to behold, but one full-use of the Canary Cry is enough to knock her out.
- The Driver: She's coerced into this new job after Harley breaks Sionis' drivers legs.
- Everyone Has Standards: Despite telling Renee she's only looking out for herself, she draws the line at men assaulting other women in any way. She shows this when a drunken Harley is almost kidnapped and despite trying to ignore the scene, she goes back to kick the men's ass and drive Harley home.
- Fights Like a Normal: She uses her power exactly once, and at a powerful enough extent that she gets Heroic RRoD. She always fights in hand-to-hand combat or with melee weapons, to great effect still.
- Genre Refugee: She fits into the larger DCEU perfectly, but the only film she appeared in didn't include or even mention any other characters with superpowers.
- Glass-Shattering Sound: When she starts singing at a higher pitch in Black Mask's club (without yet reaching the power of her Canary Cry), it shatters a glass.
- Good Angel, Bad Angel: Tries to be the Good Angel to Zsasz's Bad Angel after she's "promoted" to be Sionis' personal driver, as the three are often alone together, and she tries to advice Sionis to be more merciful to his victims while Zsaz very much enjoys encouraging his violent and murderous behavior.
- Kick Chick: Primarily uses strong kicks in her fighting style which takes a lot from Muay Thai, Taekwondo and kickboxing.
- I Am Not My Mother: A less run-of-the-mill example in that she loves her deceased mother and thinks of her highly, but is actively avoiding being like her due to how other people exploited her ultrasonic powers, to the point that it killed her.
- Legacy Character: She inherited the Black Canary power and mantle from her mother who has passed away by the time of the film.
- Make Me Wanna Shout: Her superpower, which she uses exactly once but in all its glory during the Final Battle.
- Missing Mom: Her mother died when she was younger, which lead to her being shipped from one foster home to another.
- The Mole: She leaks information about Black Mask's hit on Cassandra to Renee.
- Morality Pet: She tries to be one for Sionis after she's unwillingly promoted to his personal driver, often trying to make the best of it by advising him to be more merciful, but unfortunately his right-hand man Zsaz loves encouraging his violent and sadistic behavior.
- Ms. Fanservice: As to be expected for Black Canary. She even starts as a nightclub singer, explaining the sexy clothing.
- No Good Deed Goes Unpunished: Dinah (reluctantly) saves Harley from being kidnapped by some creeps when she's too drunk to protest, and then gets the dubious "reward" of being promoted to Sionis' personal driver after he witnesses how well she can fight.
- No Respect Guy: Implied by Harley. Not only do Sionis and Zsasz affectionately (yet condescendingly) call her "little bird," but apparently she's worked as The Chanteuse for years and no one ever really appreciates her singing.Harley: Hey, you're that singer no one listens to!
Dinah: Hey, you're that asshole no one likes!
- Only in It for the Money: It's pretty clear she knows Sionis is a ruthless crime lord but sings at his lounge anyway (though given her Dark and Troubled Past, his fondness and possessiveness toward her, and him calling her his "little bird," it's possible she doesn't fully have a choice), though she collects her paychecks singing and tries to stay out of his other affairs as much as possible.
- Painted-On Pants: Dinah wears some seriously tight trousers, especially visible when she comes to Harley's rescue outside the club. Huntress even hangs a lightshade on them by complimenting her on her ability to perform high kicks while wearing them.
- Passive Aggressive Combat: At one point while working as The Chanteuse, she sings James Brown's "It's a Man's Man's World" while giving a Death Glare to Zsasz and Sionis, sings increasingly loudly to draw attention away from Sionis knowing he's a huge Attention Whore, and for her final note she uses a portion of her Canary Cry to shatter glass (it's a bar). It flies right over Sionis' head.
- Power Strain Black Out: After Dinah uses her Canary Cry for the first time, she passes out soon afterwards.
- Race Lift: Dinah Lance is white in the comics and played by Jurnee Smollett-Bell, who is biracial (Caucasian and African-American).
- The Spock: Despite not being the leader, Dinah is the most level-headed team member.
- Token Super: In a cast of Badass Normals, she's the only one with a special power. Not that she needs it.
- True Blue Femininity: Dinah tends to wear lots of blue. She starts out wearing denim, gets a dark blue suit when she starts working as Roman's chauffeur and has a blue suit when she becomes a proper vigilante.
- Truer to the Text: Race Lift and different outfits aside, this take on the character maintains the mother-daughter Legacy Character aspect of her backstory, while also being a Fights Like a Normal Token Super with Make Me Wanna Shout powers; previous adaptations have tended to either not include one or don't go into enough detail.
- Two First Names: Per a DC Comics habit. Lance is traditionally a male given name.
Affiliation(s): Birds of Prey
Played by: Mary Elizabeth Winstead
Appearances: Birds of Prey
The daughter of an assassinated mob boss. She vowed revenge on those who massacred her family and became a living weapon to accomplish this.
- '90s Anti-Hero: Helena's willing to kill for both revenge and necessity, wears some punkish gear and rides a motorcycle.
- Advertised Extra: YMMV on this. On the one hand, many reviewers pointed out that she has the least physical screentime of any of the major characters in Birds of Prey. On the other hand, the movie actually gives her arguably the most backstory and development of any of the major characters - it's just really condensed into a handful of key scenes and a brief training montage. Nonetheless it does manage to cover her main story arc points from the comics.
- A partial reason for this might be that her character is intentionally mysterious in the first half of the movie, and only gets explained in a later reveal.
- Alternate Self: She has one on Earth-Prime.
- Archer Archetype: Crossbow, but she still ticks off a lot of the trope type. Does a lot of her work alone, was not initially on board with helping the other women out and wanted to leave Gotham after killing of all her targets.
- Bare Your Midriff: In the promo video that was from a costume test (as shown in her picture), Huntress had most of her midriff exposed which harkens back to her infamous costume from the early 2000s.
- Berserk Button:
- Dislikes being called "Crossbow Killer". It's Huntress, thank you very much.
- Don't say she she has rage issues or she will loudly and angrily tell you otherwise.
- And bows and arrows are for kids. She uses a crossbow.
- Big Sister Instinct: She had a little brother in the past, and the last keepsake she has of him is his purple toy car. She gives it to Cassandra during the Amusement Mile fight, admitting Cassandra shouldn't be witnessing all of this violence and advises her to hold onto the toy and not think of anything.
- Biker Babe: Helena owns a motorcycle and wears a matching jacket.
- Bruiser with a Soft Center: Helena shows her gentle side when she not only protects Cassandra, but also gives Cassandra her toy car and tells her to focus on it, showing she hasn't forgotten how traumatic it can be for a child to deal with mob violence.
- Catchphrase: She usually asks her victims "do you know who I am?" before she kills them. She's even seen practicing it in a mirror, to make it as intimidating as possible.
- Chained by Fashion: Huntress has a thick dark chain she wears across her chest.
- The Comically Serious: She's definitely not the kind to joke around, rather much humor comes from her Insistent Terminology and having No Social Skills.
- Conspicuous Gloves: Helena wears a pair of fingerless gloves that completes her Biker Babe image.
- Contralto of Danger: She has easily the deepest voice of all the whole cast, even more so than the men.
- Dark Is Not Evil: She's not exactly heroic, but she does work with the other women to fight against Black Mask and she states that everyone she's killed had wronged her in the past, so she's not a Blood Knight.
- Distaff Counterpart: To Batman. She became a vigilante after her parents were murdered and in her film debut she's not above murder, but quickly becomes a genuine hero and forms a team.
- Enemies List: She drew a picture of the men who killed her family as a kid and kept it 'til this day as she crosses off each face.
- Endearingly Dorky: Helena's less than stellar social skills certainly make her come across this way. When Dinah agitates her, rather than being startled she's instead on the verge of laughter.
- Excessive Evil Eye Shadow: Which she's even seen reapplying just before the big final battle. But she's not evil, just more of an anti-hero.
- Hair-Trigger Temper: She's poked fun at where Canary teasingly comments "I love this chick, she's got rage issues".Huntress: I DON'T HAVE RAGE ISSUES!
- Insistent Terminology: Two of them;
Dinah: What the hell is up with this bow and arrow schtick?Huntress: IT'S NOT A FUCKING BOW AND ARROW! It's a crossbow, I'm not twelve!
- Being called to or referred as the Huntress, not the Crossbow Killer.
- Her weapon of choice is a crossbow, not a bow and arrow, thank you very much.
- In the Hood: Her first few appearances have her wearing her hood.
- Knife Nut: While she mainly uses her fist and crossbow in a fight, she does have some knives kept on her person if she needs to say, stab someone while going down a slide.
- Lean and Mean: Helena's a lanky woman with anger problems and a list of dead enemies.
- Mafia Princess: She's the daughter of an Italian-American crime boss, though due to the massacre of her family she didn't get the benefits of this status when growing up in secret.
- The McCoy: She's the most trigger-happy teammate outside of Harley Quinn.
- Movie Superheroes Wear Black: Her outfit is much more tactical than in the comics, eschewing the purple cape and mask.
- Named by Democracy: Because she kills with a crossbow, she is labeled "The Crossbow Killer". She is really annoyed by this and constantly tries to introduce herself as "Huntress".
- Never Found the Body: When Montoya gets a good look at the adult Helena, she quickly identifies her. This is presumably because police not only never found Helena's body, but likely never found any evidence that she had died with the rest of her family, so she would be treated as a missing person instead of a homicide victim.
- No Social Skills:
- She is a brilliant fighter, but her social skills are horrible. That tends to happen when you spent many formative years raised in secret, by killers.
- She actually practices her introduction in the mirror. Too bad nobody calls her the Huntress unless she tells them to.
- Phrase Catcher: Before (and one time after) her proper name is shown, people refer to her as "The Crossbow Killer".
- Revenge: This is her main goal for the film, which Harley examines and points out to her.
- Statuesque Stunner: Like the comics, she's taller than her comrades (Mary Elizabeth Winstead is 5'8) and very attractive.
- The Straight and Arrow Path: Helena favors a crossbow over traditional firearms. Clearly she's trying to get some recognition.
- Surprisingly Realistic Outcome: Her family was massacred, with her as the Sole Survivor, meaning the police never found her body. Being a child means that police would likely look into her missing persons case from time to time over the years. This would include using age progression on known pictures of her. Thus, Detective Montoya, who's been on the force for a longer than Helena's been alive, is easily able to identify her after getting a good look at her and is not surprised to see her alive.
- This Is Gonna Suck: She does not seem enthused about the idea of joining up with the other women to take down Black Mask.
- Troubling Unchildlike Behavior: She's been training for blood-soaked Revenge since she was a child, as well as drawing graphic pictures of said vengeance rather than the typical child doodle subjects.
- Vengeance Feels Empty: Played with. She gets her revenge against the last man to kill her family and afterwards, she feels like she has no purpose to have anymore. Harley and the others then point out that Gotham is filled with worse people than the one that killed her family.
- Underboobs: Her top is cut to show the undersides of her breasts.
- When She Smiles: She mostly has a look of anger or steely determination but when she's happy and smiling, it's a joyous sight.
- Womanchild: She's pretty immature and childlike which is understandable given that she spent her formative years being trained to be a killer.
Affiliation(s): Gotham City Police Department | Birds of Prey
Played by: Rosie Perez
Appearances: Birds of Prey
A GCPD detective who investigates on Roman Sionis and Harley Quinn's antics.
- Age Lift: In the comics she's in her late 20s to early 30s, around the same age as the other main characters (except for Cassandra). Here she's played by an actress in her mid-50s.
- Boxing Battler: Her main fighting style is based on boxing.
- Bring It: At one point while fighting Harley, she puts up both of her hands and gestures for Harley to come at her.
- Brooklyn Rage: She has Rosie Perez's trademark Brooklyn accent and she's generally surly and ill-tempered.
- But Not Too Gay: Montoya's sexuality isn't given too much focus outside of Harley's narration pointing out that she works with her ex-girlfriend. To be fair, their spat does indicate their relationship has some history to it that goes beyond what would be considered professional.
- Combat Pragmatist: Even though she's a cop, she's not above fighting dirty as seen when she's fighting Harley. She grabs the others hair while they wrestle and uses her cuffs as a makeshift brass knuckle.
- Deadpan Snarker: She has a very dry and bitter sense of humor.
- Determinator: When she has enough evidence for a case, she will never let go. She's also really determined in a fight as she continues throwing punches even after she's been thrown around.
- Dude, Where's My Respect?: She's never given credit for all her work and is stuck at a desk job because of it. Said partner once again getting credit for stopping Roman is the final straw that motivates her to quit the GCPD and become part of the Birds of Prey.
- Good Is Not Nice: She is not exactly the nicest person around, but she is still a true-blue cop and someone who cares about people.
- Hard Boiled Detective: Everyone points out that Renee's attitude towards her job comes across as cliche and over-enthusiastic.Helena: Does she always talk like a bad 80s cop movie?
- Improvised Weapon: She uses a handcuff as improvised brass knuckle against Harley during the latter's mayhem at GCPD.
- The Kirk: She's analytical enough to be a qualified detective, but she's also prone to making questionable decisions and drinks when she's in a bad mood.
- The Lad-ette: Montoya's got delusions of being a hard-boiled detective and she hits the bottle pretty hard. Her T-shirt that says "I shaved my balls for this" is a noteworthy example.
- Lady Drunk: She hits the bottle hard after getting kicked off her case. It's implied from earlier dialogue that this is nothing unusual for her.
- Little Old Lady Investigates: She's in her 50s and works as a detective.
- Never Mess with Granny: Despite being past her prime and a little tipsy, Renee is able to hold her own and fend off the thugs that come for Cassandra.
- Out of Job, Into the Plot: She gets suspended from her police job after trying to make a case on Black Mask. At the end of the movie, she leaves the GCPD taking all of her things with her as well to form the Birds of Prey.
- Pint-Sized Powerhouse: Downplayed. She gets her ass kicked a couple of times, but is a formidable opponent towards Harley Quinn, which is impressive. In the movie, Harley (a 5'6", amoral, loony Dance Battler supervillain) barely breaks a sweat battling seas of hulking mooks, but her final altercation with Renee (5'1") actually gives her a real challenge.
- Power Fist: As Black Mask's gang storms the amusement park, her left hand is holding a brass knuckle.
- Red Oni, Blue Oni: She's the red to her ex-girlfriend and her ex-partner, though the latter's only calm because he got promoted over her.
- She Cleans Up Nicely: Renee Montoya is still attractive in her everyday outfits, but she's dressed a lot more modestly, in a way that doesn't draw attention to her looks. But when she actually wears one of Harley's Stripperiffic old ensembles, even Harley is appreciative of the Fanservice.
- Sherlock Scan: She could easily identify what happened at a crime scene at the beginning of the movie whereas her partner kept getting the details wrong. She even managed to figure out that the killer was a woman. She even immediately identifies Helena Bertinelli just by looking at her.
- Stealing the Credit: She's a brilliant detective, however her partner usually takes all of the credit for her hard work. Harley notes this in her narration that while he gets promoted, Renee was stuck at the detective desk because of that.
- Take This Job and Shove It: When she is told she's suspended for work, she says just about as much as she hands in her badge and gun. By the end of the movie she packs up all of her items and cooly leaves the workplace while the others celebrate her partner for the Black Mask case that he didn't even earn.
- Team Mom: The oldest of the Birds of Prey and the one who decides to put the others on the path of justice.
- Token Good Teammate: While none of the Birds are outright bad (except for Harley and arguably Cassandra, and neither of them are official members), as one of the few clean cops in Gotham, Renee is the most unambiguously heroic member of the team.
- Twofer Token Minority: A Latina lesbian.
- Working with the Ex: Renee works with her ex-girlfriend, Ellen Yee. Ellen, for her part, clearly still cares for her, but they butt heads due to their conflicting perspectives on breaking the law and due process to put criminals behind bars.
- See her character page.
Affiliation(s): Birds of Prey
Played by: Ella Jay Basco
Dubbed by: Kana Hanazawa (Japanese)
Appearances: Birds of Prey
A young teen whose habit to pickpocket things ends up getting her a bounty on her head.
- Abled in the Adaptation: Her comics counterpart has social and speech disabilities as a result of her abusive upbringing and Ambiguous Disorder. This Cass is a charismatic motormouth.
- Adaptational Early Appearance: Cass wasn't introduced until 1999, and compared to other members of the Bat-family with many decades of history under their belt, she's a relative newcomer. Yet here, she's the first member of the Batfamily we'll see onscreen besides Batman or Alfred (provided she even joins it later on). This means she appears before any of the Robins, the other Batgirls, Catwoman, Azrael, and not to mention the many other characters associated with the Batman mythos or the DCU in general.
- Adaptational Personality Change: There's so much differences with how she is portrayed in the comics that she veers into In Name Only territory.
- Adaptational Villainy: Instead of an vigilante ally to Batman, she is now a pickpocket and associate of Harley Quinn, even breaking the strong moral code the character had in the comics. Though Cass did steal in the comics, it was when she was homeless and needed to survive (and at one point to mess with Two-Face) while here it seems to be either a compulsion or because she wants attention.
- Adaptational Wimp: The comic book version of Cass is an even greater fighter than Batman, and has so much Charles Atlas Superpower she's a serious contender for the title of World's Best Warrior (her closest competition being her own mother, Lady Shiva). In the movie she constantly needs protection and barely throws a punch.
- Age Lift: Cassandra was 16 when she became a superhero in the comics, and turned 18 at the beginning of her first solo run, but is played by a 12-year old actress in the film.
- Alliterative Name: Cassandra Cain.
- The Baby of the Bunch: She's the youngest of the group, and one of the reasons the others end up working together is in order to protect her.
- Chekhov's Gun: She takes a couple of grenades from Harley's goodie box, and plants one on Black Mask after showing Harley she took "her ring". This ends in his body being exploded into pieces after Harley kicks him off the pier.
- Composite Character: While she has the name and ethnicity of Cassandra Cain, she has more in common with Catwoman's own sidekick Holly Robinson.
- Her background of streetwise urchin being picked up by an older vigilante(s) also has shades of Jason Todd.
- Her connection with Black Canary, and her role as child in need of protection, brings to mind Sin.
- Damsel in Distress: Since doesn't have the fighting ability of her comics counterpart she gets nabbed a lot in the movie, leading the other women to save her.
- Escape Artist: She shows Harley that she had been uncuffed for quite some time without her noticing.
- Foster Kid: When Dinah tells her not to listen to whatever crap her parents are yelling, Cassandra quickly corrects her by calling them her foster parents.
- In Name Only: Cassandra Cain as portrayed in Birds of Prey only shares her name with her comic book counterpart and nothing else. She speaks normally and doesn't know how to fight, whereas the comic book version of her was forced to forgo all her language skills to become a living weapon (to the extent she has difficulty reading the alphabet). She also has nothing in common with her in terms of backstory, personality, ethnic background, appearance, abilities, narrative function, or even age.
- Non-Action Guy: Simply put, she doesn't know how to fight.
- Parental Neglect: When Dinah/Black Canary comes home (they're neighbors), Cassie is sitting in the building's stairs, waiting for her foster parents to stop yelling at each other.
- Percussive Pickpocket: How she got on Black Mask's bad side was by stealing a very important diamond out of Victor's pocket.
- Sir Swears-a-Lot: She swears a lot for a kid her age, but Harley doesn't seem to care much.
- Swallow the Key: What she ended up doing with the diamond she stole. Unfortunately, now she's targeted by everyone because they have to cut her up to get said diamond.
- Tagalong Kid: She ends up becoming this once all of the other women team up.
- Troubling Unchildlike Behavior: Harley expects that she drinks alcohol.
- Two First Names: Per a DC Comics habit. Cain is traditionally a male given name.
- What Happened to the Mouse?: What became of her when Harley was recaptured prior to The Suicide Squad is unknown.