- "You wanna play? Okay, let's play!"
- ―Harley Quinn[src]
Harley Quinn is a villain in the LEGO video game series. Once a psychiatrist at Arkham Asylum, Dr. Harleen Quinzel became the Joker's henchwoman and girlfriend, due to the criminal's manipulations. Often helping her "puddin" in his grand schemes, she was also friends with Poison Ivy.
During the mass breakout at Arkham Asylum, Harley Quinned joined her "Puddin" during the escape. Recruiting Scarecrow, Mad Hatter and Killer Moth, they planned to flood Gotham City with his Joker Toxin, releasing it from Gotham Cathedral. After Joker acquired the chemicals required to create it, Harley helped capture Commissioner Gordon to distract Batman and Robin from their plan. She also appeared in his broadcast to the two, threatening to kill their hostage in a variety of ways. When the Dynamic Duo arrived, Harley confronted them, but was defeated and arrested.
Taken into GCPD custody, Harley was used as bait to capture Joker and Killer Moth. However, the two were able to free her and destroy the GCPD convoy using a giant robot they had created. While Killer Moth was left behind to confront Batman, Quinn and Joker made their way to the Cathedral, where they finished preparations for their plan. She also helped defend the building with their henchmen, but was forced to flee by the Dynamic Duo. Harley and Joker hid in the rafters of the building, but were forced out by Batman and Robin. Shortly afterwards, they were defeated by the Dynamic Duo and handed over to the GCPD. Harley was retuned to Arkham Asylum, where she could be seen swooning over Joker.
During Gotham City's Man of the Year award ceremony, Harley Quinn joined Joker's gang in attacking the event. When Batman and Robin arrived on the scene, she stayed behind to let the other criminals escape, but was defeated and returned to Arkham Asylum. Harley was later freed by a breakout orchestrated by Lex Luthor and Joker, with her cell wall being broken apart with the Deconstructor. She joined Two-Face and Riddler in the escape attempt, but were captured by Batman and Robin.
As the GCPD attempted to round them up, Harley and the other inmates were able to escape again. With Batman and Robin responding to a break-in at Ace Chemicals, they were able to successfully escape and avoid the GCPD. Harley can be found at the Amusement Mile, where she can be fought. After being defeated, she can be purchased as a playable character.
Harley Quinn does not appear as part of the main story, but briefly cameos during the end credits. She appears within three side-quests, two of which appear in the Hall of Doom. During a Nightwing side-mission, she appears as his therapist, using her position to obtain free tickets to a circus. Harley also appears in the "75th Anniversary" DLC mission, where she and the Joker attempt to sabotage Batman's anniversary party. She also appears in "The Squad" DLC mission as one of the playable characters, with her New 52 costume being available in it.
Harley helped Joker break into Wayne Enterprises and stole a Motherbox from the laboratories. Chased by Batman, they were able to escape when the "Justice Syndicate" arrived. However, Harley witnessed the Earth-3 "superheroes" teleport the Justice League to Apokolips via Boom Tube, filming the incident as evidence. Whilst preparing to break into the GCPD to steal back their confiscated weapons, Harley reported what she had seen to number of other criminals, including Riddler and Clayface. Whilst being chased by Batgirl and Nightwing, she accidently ejects herself from Joker's truck, resulting in their separation.
Making her way to the Gotham Botanical Gardens, Harley hid with Poison Ivy and told her of the incident. When Deadshot, Captain Boomerang, Killer Frost and the Rookie arrived to gain her help, a confrontation took place when they harmed Ivy's plants. Finally broken up by Catwoman, the Syndicate arrive and kidnap Quinn.
Taking her to the Galaxy Communications Tower, they interrogated Harley about the video and whether she had published it. However, she was rescued by her fellow criminals and decided to reveal it at the gala taking place there. Gate-crashing the event, Harley attempted to show the video of the Syndicate banishing the Justice League. However, she played the wrong video and the Syndicate framed the criminals for robbing the patrons, leading to their claims being ignored. Just as they are about to be arrested, a the Joker arrived on the scene and rescued them.
Fleeing to the Hall of Doom, Harley agreed to help Lex Luthor and the Legion of Doom defeat the criminals. Alongside Joker, Clayface and Sinestro, she broke into the Gotham Natural History Museum to awaken Black Adam, battling Shazam and Mahzas in the process. After the Hall of Doom is attacked by Sea King, she joined the Legion to attack the Syndicate at LexCorp. Betrayed by Luthor to the Earth-3 villains, Harley and Solomon Grundy worked together to defeat Deathstorm. After the battle, she, Joker and the Rookie were sent to Apokolips by the traitor.
Investigating the planet together, they battled through Parademons to discover the person leading the Syndicate: Darkseid. There, they reunited with the Justice League and learned that the Earth-3 villains were searching Earth for the last piece of the Anti-Life Equation. With the League also framed by the Syndicate, the group agreed to work together and send the criminals back to Earth-3. Harley travelled with Wonder Woman and Cyborg to Themyscira to recruit the Amazons, where they battled Granny Goodness.
Harley later took part in the Legion and League's battle with the Syndicate, thought was not directly involved in the defeats of Kent Clarkson, Owlman or Superwoman. After returning the criminals to their home dimension, the group realized that the Motherbox Quinn had been carrying was actually the final piece of the Anti-Life Equation. After the Rookie absorbed it, Harley helped protect it from the forces of Apokolps and later participated in the fight with Darkseid. After escaping another betrayal by Luthor, Quinn later fled with the other villains after the Rookie decided their fate.
- Graffiti (DC Super-Villains only)
- Impact Switches (DC Super-Villains only)
- Spinning Attack (LEGO Batman 2 & LEGO Batman 3)
- Wall Break (LEGO Batman 3 onwards)
- Villainess Access (LEGO Batman only)
- Cupcake Grenades (DC Super-Villains only)
- Pistol (LEGO Batman only)
- Radio (DC Super-Villains only)