Harley Quinn (Telltale)

Harley Quinn was a masked criminal and a member of the Pact. Her true identity is Dr. Harleen Quinzel, a former psychiatrist at Arkham Asylum and Blackgate Penitentiary. Harleen can become an associate of Bruce Wayne, who joins the Pact for unspecified reasons.

Biography
From a young age, Harleen Quinzel was obsessed with psychological issues, due to her father's own struggles with his mental health. Becoming a gifted doctor, she had placed in both Arkham Asylum and Blackgate Prison, during which she interviewed the mysterious "John Doe" and Oswald Cobblepot. Despite the help she offered her father, he committed suicide some time after the Riots at Arkham. Suffering a mental breakdown, Harley quit her jobs and became a criminal, calling herself Harley Quinn.

Along with Doe, she joined the Pact, but it is unknown whether she was approached by either John or another person to join the group. Despite the group originally being lead by veteran criminal the Riddler, Harley and the others worried about his choice to draw Batman's attention, due to the possible risk of exposure. It's possible that Harley was one of the people to arrange the Riddler's death, though it remains unconfirmed at this moment in time.

The Pact
During the Pact's joint attack on various places in Gotham, Harley attacked the City Brokerage without assistance from any of the Pact's men. She murdered an unspecified number of staff and security guards; mostly with her handgun but some were killed by mallet. She was able to leave the scene with $4 million dollars of stolen diamonds and the contents of a security deposit box.

The next morning, Quinn received a message from John that one of his "friends", billionaire Bruce Wayne, was looking to join the Pact and help them in their operations. Harley decided to meet with Wayne in person and arranged to meet the two outside the Stacked Deck bar in the East End. According to Bane, Harley was originally planning to murder Bruce following the initial meeting.

As John hotwired a car, Harley slipped in and held a gun against Bruce's head, asking him why she should spare him. Regardless of the reason given, she and Bruce conversed on the reasons why he was joining the Pact and what was expected. After sending John to get her a slushy, she and Bruce also talk about him and how he was still "finding himself". When John returned with the drink, they left for Wayne Enterprises, though Harley told him what Bruce had said about him. Upon their arrival, Harley told Bruce that he was to retrieve the Phalanx Key from his company, with the results of this exercise proving whether he was worthy of the Pact.

Though she and John were asked to remain outside, they followed him into the building and knocked a security guard unconscious. Harley also met Regina Zellerbach, during which she threated her, only to be called back by Bruce. After being taken down to the lab through Bruce's personal elevator, she looked through the contents of the lab whilst the billionaire unlocked the vault. During this, she noticed an EMP Generator and decided to also steal it to help make their job a little less messy.

''If Bruce is not able to convince Tiffany Fox to stay quiet or lied to her about her father's death, Harley will capture her as she tries to escape the lab. Noticing that she has the Phalanx Key, she tries to find out who she is and why she had tried to steal it. When Tiffany confronts her and John on their involvement in Lucius's death, Harley denies involvement and tells her that Bruce is planning to join the Pact. Depending on Bruce's choice, the following will happen.''

Agree with Harley=If Bruce chooses to tell the truth, Harley is distracted and sweet talks him. She lets Tiffany escape, believing that Bruce will find a way to silence her.
 * -|Deny what she said=If Bruce chooses to deny what Harley has said, she will threaten him with her hammer. She also lets Tiffany escape, commenting to John that it was actually a test to prove Bruce's loyalty.

When John gave her the Phalanx Key, she thanked him for giving it to her and listened to his story. She also asked John to steal the EMP generator and the trio left the building. Some time later, she and John split with Bruce to talk to the other members into letting him into their base. After they agreed to let him in, Harley set some of the group's men to meet with Bruce and bring him to the lair.

When Bane showed concern over letting him into the group, Harley tried to defend her decision and convince him to give him a chance. She also untied Bruce so he could turn off the EMP Generator, after John "accidently" set it off. After he was able to, Harley asked Bruce to talk to her in her office. There, she apologized for her behavior at Wayne Enterprises and why she put on the "Harley Quinn" persona. Harley also gave him some advice on how to approach Bane and Freeze. ''If Bruce learnt about her father, he may also talk to her about it. Despite threatening him, Harley admits to being impressed by his investigation.'' After talking about approaching the other members, Bruce left to see if he could get their approval.

After watching him beat down a member of Bane's gang, Harley alerted the rest of the Pact that their target was on the move. After holding a vote to see whether Bruce was to join the Pact, they launched their assault the Agency convoy transporting the Riddler's corpse. Harley, along with Bane, assaulted the agents and tried to keep them away from the escape vehicle. Depending on who Bruce chooses to help, the following will happen.

Stop Quinn=If Bruce chooses to stop Harley's rampage, the two will work together to battle the agents, though Bruce will subdue the target non-lethally and save him from certain death. Though Harley admits having fun, she is disappointed for Bruce stepping in to stop her from killing the agent. As they escape, Harley tries to tell Bane to leave the agents but leaves him when he doesn't respond.

Upon returning to the Five Points, Harley complements Bruce for his actions during the fight and argues with Freeze about leaving Bane behind. She also lets the billionaire open the case containing Riddler's corpse and reveals why they needed to retrieve it. Harley is present when Catwoman returns with a component required for the next part of their operations.
 * -|Stop Bane=If Bruce chooses to stop Bane's rampage, Harley will continue to engage the Agency. As the Pact leaves, she curses out loud, butcontinues to engage the Agency. John, having fallen for Harley, tries to convince the others to go back for her, but they refuse to, believing her to have either captured or killed.

Fractured Mask
Coming Soon

Personality
Though initially a calm and collected young doctor, Harley's breakdown caused her to look for excitement and adventure wherever possible. She also seemed to have an enjoyment for chaos and trouble, choosing to start fights or threaten others at seemingly random times. Harley seemed to be unstable, but the truth was that she put this on to throw off the other members of the Pact and to make sure she was never taken advantage of. Harley also seemed to suffer from violent outbursts whenever something didn't go her way, which made her all the more dangerous when stirring up chaos around her.

Sledgehammer/Mallet
Harley would often carry a large sledgehammer with her at all times, often to destroy objects or cause trouble. Though a very deadly weapon, Harley was able to hit it with enough force to knock someone unconscious and not kill anyone. This was often her preferred weapon in close-quarters combat and whilst on riots with the Pact.

Pistol
Harley would use a customized pistol whist out in action, though it is unclear how often she used it. The pistol seemed to be used whenever she wished to kill someone and in battles where close quarters was not a viable option.

Trivia

 * Whilst Harley's design is based on that present during The New 52, she uses a mallet like her pre-Flashpoint counterpart.
 * A baseball bat can be seen in her office, a callback to her preferred weapon within both the Arkhamverse and the comics (post-Flashpoint).