|Real name:||Dr. Harleen Frances Quinzel|
|Intern, Psychiatrist, Professional Criminal|
Base of Operations:
|Hair:||Blonde (Briefly Black as of HQR)|
|Height:||5 ft 7 in/ 1.70 meters|
|First Appearance:|| Batman: The Animated Series
"Joker's Favor" (September 1992,TV) The Batmans Adventures #12 (Comic)
| Arleen Sorkin (Batman: Arkham Asylum)|
Tara Strong (Arkham City , Arkham Origins, Arkham Knight)
Hynden Walch (Assault on Arkham)
- "It would be a shame to get blood all over my nice new outfit"
- ―Harley Quinn[src]
A Blackgate Prison and Arkham Asylum psychiatrist assigned to treat the Joker, her first patient, Dr. Harleen Quinzel instead became fixated on her patient, believing herself to be in love with him. She helped him escape from confinement and took on her own criminal identity as Harley Quinn. Quinn is a violent and unpredictable felon whose only motivation, beyond general mayhem, is achieving the Joker’s approval. Because of his cruel and mercurial nature, this in some ways makes her just another one of his victims - albeit a very dangerous one.
Before Arkham Origins IncidentEdit
Arkham Origins IncidentEdit
She worked as an intern under the psychiatrist Hugo Strange, and worked as one of the psychiatrists at Blackgate Penitentiary. At one point, she, under Strange's orders, contacted one of his patients, Alberto Falcone, the heir to the Falcone Crime Family, to notify him that he missed his past two appointments, and gave the subtle but clear threat that Strange and Quinzel will tell his father, Carmine Falcone, about Alberto carrying potentially untreated psychological issues if he doesn't continue his appointments.
By the time of Christmas Eve, Quinzel was nearly finished with her psychological residency at Blackgate. After Julian Gregory Day, also known as the serial killer Calendar Man , was arrested by the GCPD with the anonymous help of Batman , Quinzel did a psychological evaluation of the serial killer, and determined that Day was insane and thus could not be executed. However, Warden Joseph had her redo the evaluation under the pretense that he was manipulating her (although it was heavily implied that Joseph himself was being manipulated by Commissioner Gillian B. Loeb into having Day ruled sane and execute him to gain political points). She did so under the condition that she be allowed to do psychiatric analysis on all newcoming prisoners of Blackgate prisoners from that point onward.
Harleen interned at Blackgate Prison and was finishing up her Psychiatry residency. Harleen Quinzel appeared when Joker got captured by the Gotham City Police Department at the Royal Hotel and was sent to Blackgate, where she performs a psychiatric profiling on him. During this session, Joker describes the encounter between him and Batman and states that it has changed the way he thought but never specifies that he's talking about the Batman. Harleen therefore thinks that Joker is talking about her, so she grows an affinity towards her patient.
She is then seen again at the Blackgate riot later that night where she is held hostage by a group of escaped prisoners. Batman quickly intervenes but she shows no hint of any form of gratitude towards her savior, nor does she show signs of shock from being almost killed. When Batman asks if she is alright, she replies "What's it to ya?". Harleen walks away from the Batman as he states that "You were almost killed." She then replies back "Eh, occupational hazard." and reveals that the Joker is located inside the panopticon, and that he is waiting for Batman's arrival.
Harleen is finally shown at the end of the main story escorting Joker, who was laughing at Batman's deception, to his cell with a group of guards. As Harleen smiles at him, Joker states his belief that his future battles with Batman will indeed be "fun".
Batman: Arkham Origins - MultiplayerEdit
Despite not physically appearing, Harley has a presence in the Invisible Predator mode. When the player is a part of the Joker's gang, they will ocasionally hear information about the fight from her, via walkie talkie. Also, in the Blackgate Prison map, there is a drawing on a wall of a woman with pigtails surrounded by hearts, labeled 'Harley.' Lastly, when customizing your Joker Elite, you can give them a 'Harley tattoo.' These are two large tattoos, one on the chest and one on the arm, of Harley in her Arkham City attire
Assault on Arkham IncidentEdit
Harley and the Suicide Squad work for Amanda Waller on a secret mission.
Between Arkham Origins and Arkham Assault IncidentEdit
Road to Arkham IncidentEdit
Harley made her way to Bane's holding room in order to sedate him. The reason for this was to keep him quiet when the "visitors" arrive. She then went and sat in the security control room, watching the monitors and awaiting the Joker's arrival for incarceration as her signal.
Arkham Asylum IncidentEdit
While Batman and security guards escorted the Joker through a Intensive Care unit of Arkham Asylum, Harley was already in the security control room waiting for his signal. As the Joker broke free, she opened the adjacent security field allowing him to escape Batman and implement his takeover of Arkham Asylum. The Joker then proceeded to release all his followers from their cells to attack Batman. Harley then took Warden Quincy Sharp hostage, taking possession of his decorative cane as well as wearing his warden identification card, and contacted Batman on the monitor. She claimed that the Joker was now in charge of the island and she was substituting for Sharp as warden. She also told Batman that Joker was having a homecoming party with Batman as the guest of honor. Batman gave Harley one chance to surrender, which she refused before smashing her monitor with Sharp's cane, cutting off the feed. When Batman made his way to the elevator shaft, Harley appeared, stating that the Joker didn't need to see Batman just yet. She proceeded to blow up the elevator cord, causing the elevator to crash to the floor below and sending herself to the top, nearly killing a security guard named Henry Smith had Batman not saved him. Harley then regrouped with Frank Boles, who had taken Commissioner Gordon hostage. She and Boles proceeded to secure the front entrance of the Intensive Treatment Center and fight off the guards with an army of Blackgate prisoners. After Boles, who had outlived his usefulness, had been disposed of by the Joker, Harley took Gordon and carried on without him.
Quinn, with Gordon, made her way to the Batmobile first, ordering her goons to break into it. She then proceeded to the Medical Center and sat in the main entrance with Gordon tied to a bench by her, relaxing during her "me time". Batman eventually tracked Gordon to the entrance and found Harley humming to herself, but was unable to reach her due to a energy security gate blocking her. Spotting Batman as he walked in, she told him to scram. He asked where Gordon was, to which she replied "Wouldn't you like to know?." Gordon then shouted to Batman, and Harley told him to shut up and threw a glass mug at him. He called Harley a "crazy bitch", and Joker contacted Harley via monitor. He yelled at her, and she squealed in a startled tone. Joker asked why Batman was in the Medical Center, as it was "too early." Harley apologized and kissed Joker through the monitor, asking him not to be angry with her. He then said "You little minx! I could never stay mad at you!" and turned off the monitor. Harley then said that Batman needed to find another way in and bid him farewell, cartwheeling out of the room. She took Gordon to Bane's holding area, given orders by the Joker to kill Gordon if anyone spotted Batman nearby.
Batman followed a trail of tobacco left by Gordon to the Medical wing, defeating Harley by crashing through the glass ceiling above her, and rescuing Gordon. Harley, however, evaded capture after Bane attacked Batman. Harley made her way back to Warden Sharp and followed Batman to Arkham Mansion. She came across Batman stunned on the floor after the large explosion in the Warden's office killed Dr. Young, making an empty remark of pity and expressing how Joker "hates a squealer." She then took the tape off of Sharp's mouth and smacked him around with his cane, accidentally breaking off the jewel tip of it after aggressively striking him on the head. She left a few goons to take Batman to 'the party', but he defeated them and used the Warden's DNA traces from his severed cane tip to follow Quinn. She then made her way to the Penitentiary with the Warden, forcing him to read a variety of threatening statements written by Joker over Arkham's intercom system and torturing him when he hesitated and insulted her.
After locating the Warden locked up in an abandoned control room, Batman saw Harley on a nearby monitor, passing Poison Ivy's cell. Despite not being on the 'party list', Poison Ivy convinced Harley to let her free since they are friends. As Ivy happily strode away and blew Harley a kiss, Harley sighed and said "She's a good kid."
Batman followed Harley and surpassed a variety of her traps until there were few goons left standing. Harley even electrified the pacification system on the asylum floor to the maximum power to stop his advance, electrocuting a security guard as a demonstration. Batman eventually got past this obstacle and fought his way through the remaining Blackgate convicts and escaped mental patients before the fifteen remaining thugs attacked Batman in the Extreme Incarceration cell block. After they were defeated, The Joker decided that Harley had failed him, removing Harley from the 'party list', much to her annoyance. Out of anger, Harley used her acrobatic skills to attack Batman but was defeated with ease. Batman took Harley's 'party list' and scanned her hand, acquiring her fingerprints.
Batman locked up Harley in an adjacent cell, with Harley accidentally revealing the Joker's location and claiming he would rescue her. Batman left Harley crying alone in her cell. After walking into a nearby room to examine a glowing green trophy placed there by Riddler, Batman became trapped inside after a set of bars slid over the doorway. Harley then taunted him: "The stupid bat has fallen into my trap!", suggesting that she had Riddler place the trophy in there to trap him. Batman used his Explosive Gel to destroy the wall above the cell and climbed out back into the cell block, prompting a shocked Quinn to give a violent start and demand, "What? How did you get out of there!?"
It can be safely assumed that Quinn was escorted back to her usual cell by the surviving Arkham staff upon the Joker's final defeat.
After Arkham Asylum IncidentEdit
Six Month's later, Harley has been incarcerated in a high security cell, believing the rampant rumors that the Joker is dying to be false. However, her hopes are soon shattered when she overhears a conversation between some guards not only confirming the Joker's short lifespan but also a conspiracy to have him killed. With this she kills and replaces one of the guards planning to kill Joker and rescues him right in the middle of the attempt on his life.
With this she hijacks a supply boat and uses it to sneak into the recently completed Arkham City, setting up her and Joker's base of operations in a abandoned factory. According to Hugo Strange, Joker's inevitable fate is having a hard impact on her causing her to fall into a depression and adopting a increasing militant approach. Later on she is shown helping Joker with his recruitment campaign screening a potential recruit Lester Kurtz, giving him his clown mask, and showing him to his room before he ran off. During Strange's monologue in the final issue, she is seen looking sadly at Joker and shedding a tear.
In another issue, it is shown she had a great deal of jealousy for Scarface, who was much more entertaining to the Joker. "By accident", she dropped the dummy into a furnace and apologized. Another copy of the dummy was brought out and Joker used it to point at Harley as if to say "I'm watching you" showing he's enjoying messing with her mind.
Before Arkham City IncidentEdit
Arkham City Lockdown IncidentEdit
Harley kidnaps a reporter to use as hostage to get Joker freed, Batman fights Harley Quinn's thugs in the Industrial District before encountering Harley, who releases her remaining thugs in an attempt wear Batman down before attempting to kill the reporter herself only to be knocked down by a Batarang. After defeating Mr. Hammer, Batman captures and takes Quinn to jail.
Arkham City IncidentEditHarley first appears in the Church, with Joker's gang keeping hostages. As Batman enters, she back flips towards him. However, Batman's reply is to contemptuously throw her aside as before. The thugs tell Batman to let her go or they will kill the hostages forcing Batman to relent. Harley agrees and tells him about Joker's condition and tells her henchmen to keep him busy. Mocking Batman, she walks towards the door, looks at Batman and blows him a kiss, and drives to the Sionis Steel Mill.
When Batman enters the main hall of the Steel Mill, she tosses down Stacy Baker, a young doctor who failed to help Joker and calls in the one armed thug, Mr. Hammer as entertainment for the clowns. As Batman rushes to save the doctor, at the last second as Baker is going to get crushed, Harley tells him to stop, saying Joker wants her to suffer a bit more while demanding the thugs go capture Mr. Freeze, who apparently has a cure for the Joker. Baker is dragged out and Batman makes his way out. When in the main area, Harley angrily yells down at him angry that the Dark Knight is still alive, closing the metal doors of the foremans office. As Batman walks away, through the walls, Harley exclaims "Oh Mr. J! You look perfect! ...Oh....its not really you, is it?" and Joker shushes her.
After finding and saving Stacy, Batman breaks through the doors of the facility with a crane hook, but is stopped by Mr. Hammer as Harley angrily tells Batman to leave Mr. J alone. After Batman beats Hammer and several other thugs, he hears Harley scream in anguish as he grapples up, finding her by an apparently dead Joker. Shoving her aside and scanning Joker, she asks why he's so mean, leaving him open to a knock out gas attack by Joker, who tells him he "fell for the old fake Joker gag!" As Batman reels from the gas, Harley approaches with a baseball bat, saying "Batter up!" and knocks him out.
As Batman awakens, Harley reaches for his mask hoping to know the man behind the bat, but Joker calls her back Harley and complains but Joker makes it clear that "No one's who you think they are" and she sullenly waits while he talks to Batman.While batman and Mr.Freeze were fighting, the cure for the Titan disease was stolen by Harley and Batman chases after her. However, when he finds her in the Sionis Steel Mill, she is taped to a pole and gagged with duct tape with no cure in sight. When Batman pulls the tape off, she angrily complains, saying she won't talk, especially about Mr. Freeze's gear Joker stashed in the boiler room. She is later revealed to have been tied up by Talia al Ghul, who stole the cure back from her.
At the Monarch Theatre, Harley and his thugs were outside waiting for Joker to become immortal, but they find Batman carrying Joker's dead body and the horrified Harley Quinn falls to her knees, mourns his death, and plans to avenge her boyfriend and lover, the Joker.
In the game when you're in the Joker's hideout, Harley's old outfit from Arkham Asylum hangs on a mannequin. Below the outfit is a positive pregnancy test that can be seen. At the end credits Harley sings "Hush little baby", implying that she may be pregnant with the Joker's child, or that she has already given birth.
Harley Quinn's RevengeEdit
After the Joker's death, Quinn became even more psychotic and fierce, managing to strike fear and respect into the Joker's old henchmen, who had previously seen her as a useless bimbo. She is shown to be constantly mourning, donning a darker outfit and frequently crys. Her bursts of anxiety lead her to kill a henchman at random and instead of becoming annoyed at the henchmen when they make a pass at her (as she had usually done prior to Joker's death) she becomes infuriated and murderous, declaring that they should not try to seduce "a widow."
Weeks after the Arkham incident, Harley breaks out of the holding facility she's in and hatches a plan to kill Batman and avenge the Joker. She reforms the Joker's old gang and despite initially meeting resistance from Mr. J's old crew, her new, more vicious and more psychotic personality convinces them to join her. As part of her plan, Quinn kidnaps several police officers and locks them away in the old Steel Mill. Batman gets sent in to save the hostages but is captured by Quinn, who locks him in a giant statue of the Joker inside the shrine she'd built for him.
Days later, Robin went into the Steel Mill to look for his mentor. After finding his discarded utility belt in the smelting chamber, he goes to the Shipyard, where Quinn is holed up. There, he finds Batman in the Joker statue and discovers that he needs Harley's access key to free him. Robin finds Quinn and defeats her henchmen before fighting her. Though Quinn proves to be a tricky adversary, Robin ultimately defeats her and takes away her access key before leaving her hanging upside down from a catwalk.
After Robin saves Batman, Quinn unveils her plan: a suicidal bombing of the Shipyard aimed at killing Batman and Robin and "reuniting her with dear Mr. J." She triggers the explosives but Batman manages to defuse them before they go off, while Robin frees the captured policemen. A furious Quinn reveals her failsafe; a hidden bomb in the Joker statue. The mad woman sets it off to kill herself and Batman but fails when the Dark Knight leaps out of a window, carrying her with him.
A tearful Harley yells at Batman that he should have left her behind but Batman ignores her as he realizes that Robin is nowhere to be seen. Suddenly elated that she managed to kill Robin, Harley mockingly tells Batman that now he knows how she feels before trying to stab him in the head with a concealed dagger. She fails, as Robin appears and knocks her out with a shuriken. Harley is subsequently arrested and taken back into custody.
Arkham Knight IncidentEdit
One year after the events of Arkham City, Harley and Batman's foes unite with Scarecrow to destroy the Batman.
Real Name: Dr. Harleen Frances Quinzel
Batman's Database ProfileEdit
Quinzel is finishing up her psychology residency at Blackgate Prison. It seems odd that a student would try to work at a facility that has little desire to rehabilitate its inmates, but perhaps her interest in the criminal mind will bear fruit.
- Keen interest in the criminal mind
- Intern at Blackgate Prison
- Most senior medical staff member working on December 24th
Dr. Penelope YoungEdit
Dr. Penelope Young Notes
Transference is a professional danger that every psychiatrist must be ready for, but Dr. Harleen Quinzel experienced what might be classified as delusional transference when she convinced herself that she and the Joker were in love. Displaying symptoms of bipolar disorder, with the Joker's mood swings as the causative agent for her manic and depressive episodes, Quinzel also shows a high level of dependence on the Joker. His maltreatment of her gives this dependence a dimension of sadomasochism.
- Additional Notes: She shows signs of extreme regression in the Joker's presence. The excessive and invasive psychological screening I had to undergo here at Arkham was largely due to her earlier fall from grace. At times I'm resentful of this; the mere idea that I would become inappropriately involved with the Joker or any other inmate is preposterous.
- Escape Risk?
Dr. Hugo StrangeEdit
Dr. Hugo Strange Notes
The Joker's plaything and sometimes girlfriend, Harley Quinn was happy to leave Arkham Asylum so long as she could be with her 'puddin.' Her devotion to the Joker is admirable, but it is clear that his illness has laid a heavy burden on her as well. Her behavior has become evermore erratic and vicious, as she appears to be in a state of emotional metamorphosis, manifested by her change in wardrobe to a more militant, harsh appearance.
- Additional Notes: Ms. Quinn’s behavior has become evermore erratic and vicious.
- Surprising strength and stamina
- Superior gymnastic skills
- High disregard for human life
- Like the Joker, she is a homicidal psychotic who escapes easy classification
Patient InterviewsEditHarley Quinn's Revenge
- "My name's Harleen. Harleen Quinzel."
- "Just kill me and get it over with."
- "What's it to ya?"
- "The cops in this city - always beating on the sick and defenseless."
- "Eh, occupational hazard."
- "Look. I know why you're here. He's in the Panopticon. And he's waiting for you."
- "Yeah. I'm sure I'll feel a lot safer surrounded by a bunch of cops."
- "Get this over with already. I've had enough for one day."
- "This old man looks like he's gonna pee himself someone bring me a bucket." - to Joker's men while holding Commissioner Gordon hostage.
- "Can anyone hear me? Is this thing on? Oh, hiya, B-Man. Harley Quinn here. How do you like my new uniform? Pretty hot, huh?"
- "Die! You big ugly Bat!"
- "Ooh, that's gotta hoit!"
- "When Mr. J kills Batman, we're gonna get married. It's gonna be so cool!"
- "Y'know, Bats, I always thought there was a spark between us."
- "You won't find Mr. J! He's in the secret lab in the gardens and... Oh crap!"
- "Call me Harley, everyone does."
- "I've always had a thing for extreme personalities. You can't deny there's an element of glamour to these super criminals."
- "I'm sure I'll be fine, Doctor."
- "Patient interview number 1."
- "Oh, you already have. Tell me, why do you do the things you do?"
- "Fame, notoriety, a desire to stand out from the crowd? A wicked sense of humor."
- "Really? Oh, you're just playing with me."
- "Unless what? Tell me!"
- "Care to tell me how these got in my office?"
- "I think the guards would be interested to know you've been out of your cell."
- "How do you know I haven't already...?"
- "Harlequin, like the clown, I know. I've heard it before."
- "Really? Go on!"
- "Who? Batman?"
- "The police?"
- "That's really incisive."
- "I got what you wanted."
- "Of course I am. He needs to pay for what he's done to you."
- "Uh, uh, uh. The Doc's out puddin'. Say hello to your new and improved Harley Quinn."
Assault on ArkhamEdit
- "You got it all wrong, baby. I was using them to help you escape."
- "It would be a shame to get blood all over my nice new outfit."
- "Hush little baby, don't say a word, momma's gonna kill for you the whole damn world."
- "Coming through, B-man!"
- "Batter up!"
- "" If he does anything funny, KILL HIM!""
Harley Quinn's RevengeEdit
- "I don't think so, Bat-brain. It's dead cop time."
- "This is for you, Mr. J."
- "Don't worry. This is all part of my plan."
- "Did you think it was gonna be that easy? Well think again, loser!"
- "I've got what you call post-traumatic stress, brought on by the violent death of a loved one. My doctor tells me they might trigger uncontrollable bouts of guilt, or acts of extreme random violence. Too bad for him!"
- "Oh, Mister J.... Why did you leave me? Why? What did I do? Why?!" (begins sobbing)
- "Well look who's too late to save the day. How's it going, Bat-brain? It's been awhile."
Game Over LinesEdit
Batman: Arkham AsylumEdit
Batman: Arkham CityEdit
- "Stupid little dead bat! Who's gonna save ya now?"
- "I knew it. You're nothin' but a lightweight loser."
- "You were supposed ta save Mr. J bat-brain."
- "If you're dead, who's gonna save poor Mr. J?"
Harley Quinn's RevengeEdit
- "You're gonna pay for letting Mistah J die!" (as Batman)
- "Good, I hope it hurts!" (as Robin & Batman)
- "Tough luck, Bird-brain." (as Robin)
- "Oh no... You're all dead! Who's gonna save Batman now?!" (as Robin)
Batman: Arkham CityEdit
- "Keep this to yourself, but I think Batman may be here. If you see him, kill him!"
- "Hello? Is this thing on?"
- "What?! I'm busy!"
- "Listen, if anyone asks about Mistah' J, tell them he's fine. No, don't tell them anything. Well, tell them that you're not going to talk about it, and then shoot them in the face. OK?"
Harley Quinn's RevengeEdit
- "Leave me alone! Do you hear? Leave me alone!"
- "Hey, dumb-ass! Yes, you! I want to be left alone. I'm working on a plan, and I need to make sure that it's the best plan in the world and I can't do it with you bothering me."
- "I hope you enjoy pressing that button, dumb-ass. Now you made my list. It's a long list of all the people who pissed off me and Mistah' J. And... and now he's gone... It's up to me to make you pay!"
- "Are you guys just plain stupid? I said do not disturb."
Batman: Assault on ArkhamEdit
Batman: Arkham KnightEdit
- In Dr. Young notes, Harley Quinn is seen to have caught Penguin's attention, due to his signature, and based on the past to present, Harley is seen more as more into the action rather than Joker, and in Arkham City, they are against each other, so from the comics, he needs to eliminate the 'slut.'
- Harley's first several interview tapes almost directly quotes her lines in the New Batman Adventures episode "Mad Love", while she is taking a tour of the Asylum.
- Harley's sealed off office can be found, adorned with posters and newspaper articles of the Joker, as well as her original costume's head piece.
- In one of the Arkham City preorder commercials for GameStop, Harley is the narrator.
- When you enter the Joker's Funhouse and head up to his office, Harley's old outfit from Arkham Asylum will be displayed. On the ground to your left, there is a "Fruitful Endeavor" pregnancy test that reads "positive." Also, if you find the pregnancy test before the game is complete, Harley will sing her own customized version of "Hush Little Baby" during the credits.
- In Harley Quinn's Revenge, there are several negative pregnacy test and a crib with Scarface painted like Joker. Also, inside the crib there a box stating "WARNING: Test may result in false positive". This heavily hints that Harley is not actually pregnant, and Scarface is probably the "baby" she is singing to in the credits of the original game.
- The tattoo Harley has just above her left hip was probably attained somewhere between Arkham Asylum and Arkham City, as she does not have it in her Arkham Asylum sprite. As it was impossible for her to get a tattoo on Arkham Island, she most likely got it somewhere inside the mega prison.
- Harley releasing Ivy from her cell in "Arkham Asylum" could be a direct reference to their odd friendship from the comics and animated series.
- On Batman: Arkham Origins there's a badly drawn image of Harley, with a heart drawn beside it, appeared on one wall in Gotham.
- If the player is in Joker's gang during the multiplayer in Arkham Origins, she will occasionally say information about the battle.
- In the Arkham Universe, Harleen Quinzel first interned at Blackgate Prison where she psychoanalyzed The Joker (in Batman: Arkham Origins) and this is where she grew to love her patient. This was the first time her and Joker met in this universe. She assumingly switched her work place from Blackgate to Arkham so that she can study the criminally insane.
- Solving the Detective Case "Doctor's Orders" in Batman: Arkham Origins Blackgate reveals further than she developed an obsession with Joker, from smuggling a spray can to him, to addressing him as "Mister J" in some patient reports.
- Contrary to popular beliefs, the meeting between Joker and Harley at the Asylum (as depicted in the audio tape from Arkham Asylum) is NOT their first actual meeting.
- Harleen Quinzel is holding a clipboard with a sheet of paper on it, on her character trophy in Batman: Arkham Origins. On this sheet of paper, "Suicide Squad" can be read. In the comics, Harley Quinn is currently a part of the Suicide Squad.
- She eventually joined the Squad, as seen in Batman: Assault on Arkham.
- In the audio evidence files from Batman: Arkham Origins, it is revealed that Harleen's internship at Blackgate was under Hugo Strange as she was calling Alberto Falcone asking him why he is missing appointments with Strange. When confronted by Falcone about Strange's experiments she brushed it off, implying that she is fully aware of his experiments and doesn't seemed bothered by it.
- In the first extortion file on Blackgate Warden Joseph a conversation between Harleen and Joseph takes place. Throughout the audio Harleen seems suprised that Blackgate does not rehabilitate the insane and only keeps criminals locked up. She sounds disappointed at this and seems to want to be close to the criminally insane. This further explains her switching from Blackgate Prison to Arkham Asylum after its reopening.
- In Calendar Man's cell in Arkham Origins, there is a note on the wall saying "Happy Holidays, Julian! - HQ" It is unknown whether this is Harleen, but due to her fascination with his case, it is a major possibility it is from her.
- Pre-Ordering Batman: Arkham Knight will enable the player to play as Harley Quinn.
- From the screenshots of Harley in Arkham Knight, it looks like she's wearing a cross between her Arkham Asylum outfit and her Arkham City outfit.
- Given her radical costume change from Harley Quinn's Revenge and Arkham Knight, it's likely that Harley has finally gotten over her mourning period for the death of the Joker. Although she probably still wishes to avenge him.
- She is one of the only villians to appear in all 4 games, just like the Riddler and Bane.
- In fact, she is the only one from the Gotham Sirens to appear in all four games.