"[Narrating an animated/live action flashback of her origins] They say "If you want to tell a story right, you gotta start at the beginning". [A sperm cell penetrates an oval cell] Too far? Fine. This is me, Harleen Quinzel. When I was a kid, my dad traded me for a six-pack of beer, but however many times he tried to ditch me, I kept coming back. Eventually, he found me a new home; the good sisters of St. Bernadette's taught me a lot. But I was never an "establishment" kinda gal. All things considered, I did good. I even went to college, got my Ph.D., Had my heart broken once or twice; finding love, it's not easy. So I threw myself into my work, became a psychiatrist. That's when I met him – Mister J, my Joker! Oh, I fell hard – like "out of a plane without a parachute, right on your dumb fucking face" kinda hard! I lost all sense of who I was, I only had eyes for Puddin’. We all know the saying: "Behind every successful man, there's a badass broad". Well, that was me! I was the brains behind some of Mister J's greatest stunts! Not that he let anyone know it. I guess all good things have to come to an end. So... we broke up."

"Number one, no one is like me. If you wanted to even come close, you would have to go to medical school. Become a psychiatrist, work in an asylum. Fall in love with your patient, break said patient out of said asylum. Begin a life of crime. Jump into a vat of chemicals to prove yourself to a madman. Get arrested by the Batman. Go back to jail, get out of jail with a bomb on your neck. Save the world, go back to jail, and break out of jail before breaking up with the before mentioned madman and going out on your own. Number two... Six bucks for tap water with a fucking cucumber stick in it? That's crazy. I'm not shopping at this store. I'm robbing this store. Consider this your first lesson. Paying is for dummies."

"I know the East End better than anybody. You want this diamond back? I'm your gal. Mister J once lost a rare photograph of a nude Eleanor Roosevelt, and I found it in a bird's nest in Robinson Park!"

"He's after all of us! [Cassandra states] The kid just robbed him! [To Canary] You betrayed him! [To Huntress] You killed his BFF! [To Montoya] And you're dumb enough to be building a case against him! So, unless we all want to die very unpleasant deaths, and let Roman go finger-fishing through the kid's intestinal tract, we're going to have to work together!"

"Aren't you glad you wore that? Sexy and bulletproof!"

"[After Dinah uses her Canary Cry to defeat Sionis' mobsters and help Harley give a speed boost to catch up with Sionis' car, before fainting from using her power] Told you she had a killer voice."

"Here's the thing, Romy, baby. Your "protection" is based on the fact that people are scared of you. Just like they're scared of Mister J. But I'm the one they should be scared of. Not you! Not Mister J! Because I'm Harley fucking Quinn!"

"I want to kill you, because without the Joker around... I can. For all your noise and bluster, you're just a silly little girl with no one around to protect her."

"Friends! Brothers! Men of Gotham! I have funded you. I have protected you. I've scratched your backs and kept you out of jail. Well, now it's time to say thank you. Go show those little bitches you don't mess with Roman Sionis!"

"[when picking up a grenade from Harley's chest of weapons] Dope."

"[to Harley, during the scene where she was held hostage by Black Mask, before revealing she put a grenade on him with the pin she held on her finger] I took your ring!"

"Margot Robbie as Harleen Quinzel / Harley Quinn"

"Mary Elizabeth Winstead as Helena Bertinelli / Huntress"

"Jurnee Smollett-Bell as Dinah Lance / Black Canary"