Harleen Quinzel (Earth-1: Post-Crisis)

Dr. Harleen Frances Quinzel, PhD, also known as Harley Quinn, is a criminal active in Gotham City and a member of Task Force X. Quinn is also the owner of Harley Quinn & Associate: Badass Motherfuckers and an ally of the Birds of Prey.

Corto Maltese Mission
A year later, Harley was captured and imprisoned back in Belle Reve, where she was recruited on a mission to Corto Maltese.

Team 1 Ambush
Meeting Boomerang after their previous mission, Harley greeted him as she boarded the Sheba. The team then dropped in the shores of Corto Maltese, where they swam to the island. However, Blackguard exposed their hiding location and started a battle between the army and the team. During the battle, Harley witnessed the deaths of her teammates and Boomerang being shredded to pieces by a helicopter. As the battle concluded, Harley went up to Javelin and spent his last minutes together, with the later giving his javelin to Harley.

"Harley Luna"
Harley was later found in a hole on the ground and was given a dress to meet the president of Corto Maltese, Silvio Luna. As they met, Luna expressed her appreciation in her work against the America government and proposed to her, deeming her work would make Luna a supported leader of the Corto Malteseans. However, Luna's story and goals set a red flag in Harley, who later shot him with a pistol and was captured by Mateo Suarez.

Hanged in the attic of a building, Harley refused to tell the number of Meta-powered soldiers that landed on the island and was shocked by an electric baton. Fortunately, Harley was able to strangle the guard and steal the keys for her escape. She then retrieved the javelin and stormed out of the building, killing the guards in the process. As she got on a taxi, she saw Rick Flag and Bloodsport sneaking to the side of the building and revealed herself to them, realizing that they were there to save her from captivity. DuBois introduced himself and Harley joined the team once again, now with the goal to destroy Jotunheim.

Operation Jotunheim
The team soon got into their respective suits, with The Thinker driving to Jotunheim and infiltrating the building. The team then stormed the building in the rain and was able to enter the lobby.

Under the commands of DuBois and Flag, Harley, Polka-Dot Man and Milton followed the former to plant a series of explosives on the walls of Jotunheim. They were then confronted by a group of soldiers who shot and killed Milton. Despite being with Milton for the entire mission, the team were not able to recall him as Krill got emotional over the death of one of his teammates. He then shot a series of polka-dots at the soldiers despite Harley's warning and triggered the explosives on the floor, igniting a chain of explosions and destroying the building.

Thankfully, Harley, Krill and DuBois were able to survive the fall and was able to hang on to the remaining constructions of the building. With the team back together, they ran away as Starro had escaped control. The team were able to protect themselves from Starro's extensions by covering their faces under Cleo's advice. Despite Starro's escape, Waller demanded the team to leave as the objective of the mission was completed. DuBois slowly walked away, only to be forced back by his compassion as Harley proudly followed.

Waller back in Belle Reve was then knocked unconscious by Flo Crawley. The team followed Emilia Harcourt and John Economos' orders to evade Starro, fighting the injected individuals with their respective abilities. During the chaos, DuBois gave orders to the team, telling Harley to take the high ground. With Starro demobilized by Polka's attacks and Ratcatcher 2's army of rats, Harley leaped onto Starro and entered his eye, paving the road for the rats to enter and attack Starro's brain.

Going Home
After the tiring battle concluded, Harley climbed out of Starro's eye and talked to DuBois about Flag's death, who was one of Harley's few friends. DuBois expressed the same, reminding her that they saved the world and they could not have both at the same time. Harley then asked to be DuBois' friend, only to call him Milton as he slowly walked away. The team was soon greeted by the Sheba, which brought them back home after Waller agreed to DuBois' deal for not releasing the hard disk of Project Starfish.

Abilities

 * Genius-level Intellect: Before turning into Harley Quinn, Quinzel studied in Gotham City University and became an intelligent individual.
 * Expert Psychologist: Quinzel majored in psychology and was later hired by Arkham Asylum as the personal psychologist of the mentally challenged Joker.
 * Deception: Harley expected in deceiving her opponents, often through the act of flirtation and empty promises.
 * Peak of Human Physical Condition: As an experienced and skilled criminal, Harley was shown to be in her peak physical performance and was able to fight well-trained soldiers easily.
 * Expert Acrobat: Harley is able to leap from building to buildings and do a flip easily.
 * Expert Gymnast: While being imprisoned in Belle Reve, Harley was shown to be flexible and was able to hang on a single rope in her cell. Later, Harley was able to steal a key from a Corto Maltesean soldier and bent her leg to her head, unlocking the chains and escaping captivity.
 * Master Hand-to-Hand Combatant: Harley was shown to be a skilled combatant and was able to fight highly trained individuals easily.
 * Expert Knife Fighter: Harley possessed a knife which he used briefly for combat.
 * Javelin Mastery: After being given a javelin by Gunter Braun, Harley was shown to be able to fight soldiers using the weapon.
 * Skilled Skater: Harley was shown to be a skilled roller skater.
 * Marksmanship: Harley was trained to use a firearm, which she possessed while operating as a criminal.

Weaknesses

 * Mental Illness: After falling in love with the Joker, Quinzel struggled with her mental illness and was later tortured by the clown prince. Her insanity also hinders her genius-level intellect, which often affects her judgment. It was later shown that Harley also possesses a unique vision after turning insane, seeing blood as flowers and hallucinating non-violent objects.

Current Equipment

 * Guns: As a criminal, Harley used multiple firearms and shot her opponents.
 * Love/Hate: Harley uses a Chiappa Rhino 60DS revolver with the words "love" and "hate" written on the side of the firearm.
 * Harley Quinn Suit: Harley wore a red and black protective suit with goggles while operating as a member of Task Force X.

Former Equipment

 * Good Night: Harley used a baseball bat with the word "good night" written on the side. However, she only used it during her first mission with Task Force X.
 * Fun Gun: Harley used a shotgun weapon when she stormed a police precinct.
 * Javelin: Harley was gifted a javelin by Gunter Braun which she used against Starro.