Harley Quinn

Bio
Harley was a therapist at Arkham and took on Joker's case, unfortunately, his particular mental issues had a massive impact in Harley, which is what caused the transformation from Harleen to Harley. For a while, she was trapped in a mentally, emotionally and physically abusive relationship with the Joker. However, she, fortunately, found her way out of that, now, while she still has a penchant for chaos, and often does bad things, the kind heart beneath sometimes shines through.

League of Villains
Harley Quinn joined the League of Villains, the job she was given was to cause chaos, her specialty. She decided to go to the hospital to make some noise, but Red Hood crashed her fun, murdering her guys, and leaving her for the police to pick her up.

Interrogation
At the station, she had an interesting interview with Detective Roger Davis. She liked this detective more than the other's he was different in a good way, he did not underestimate her and did not think let his position go to his head. During this interview, Harley became Harleen for a bit. She also made it clear that she did not expect to stay in jail for long, and told him about Red Hood.

Escape
Sure enough, that night, Benny showed up to break her out.

The Ball
Harley attended the St. Patrick's Day Ball as Harleen, and Davis recognized her. He agreed not to make a scene and the two spoke for a while. Harley had come for the food, but also the drinks, and started to get a bit drunk. When Two-Face crashed the party she left Davis to find a friend of hers she saw earlier. That friend was Selina, she was annoyed Selina had not kept in touch. Selina said it was a bad time for this conversation, and they should leave, Harley agreed, but first wanted to get Davis to get him out of there as well. Once they got out Selina left them, and Davis offered his apartment as a place to go to next. He said she could crash there, and she did, he also said she can crash there whenever, and she said she was going to do so anyway. The next morning she left and thanked him with a kiss on the cheek.

Doing Good
Harley sees a woman getting mugged, and saves her, getting a broken rib in return. Fortunately, it is outside of Davis' apartment so she goes to him for help. He helps her, first taking her to a discrete doctor, but he cannot help, so they go to the hospital. Davis' badge helps cover up the truth, staff assume they are there on official business. Harley is treated as quickly as possible, and once the surgery is done and she is awake, the two return to Davis' apartment. Harley immediately goes to the guest room for rest, having symbolically left her mallet outside of the apartment.

Still sporting a broken rib, Harley came across Joker's thugs breaking into a jewelry shop. She attempted to stop them, unsuccessfully, until Batgirl and Batwoman intervened, mistaking Harley as the leader and taking out the goons. She admitted that she was trying to stop them and that she had left Joker. Her and Batgirl become friends and Harley offers to help Batgirl and the Batfamily if they need it. Then, Batgirl and Harley leave, after Harley leaves a calling card for the cops.