Warning: SPOILERS for The Suicide Squad
Harley Quinn has grown significantly since her DCEU debut in 2016’s Zack Snyder’s Justice League.
Harley was first introduced as a prisoner of Belle Reve Penitentiary who just wanted to be reunited with her abusive puddin', with Suicide Squad’s theatrical cut almost entirely glossing over the torture he subjected her to. In Task Force X, Harley has fully embraced her independence, with increased disdain for the Joker.
However, Harley’s relationship with her ex remains a huge unanswered question in the DCEU. Although the Snyder Cut isn't currently regarded as canon, the Joker's inclusion was another reminder that he is still out in the world. If Harley really has emancipated herself from him, and now seems firm against toxic relationships, then it's strange she hasn't tried to kill the Joker. This could be because she's secretly afraid to face the man who spent years tormenting her, but there's also the larger issue of the Joker's now tenuous position in the DCEU.
Birds of Prey saw Harley alter her tattoos to remove their connection to Mr. J In The Suicide Squad, Harley's jacket references Leto's Joker with the words "live fast, die clown" and her characterization s this sentiment. She talks about recognizing red flags in love interests, killing Corto Maltese dictator Silvio Luna (Juan Diego Botto) upon learning of his murderous plans. This all originates from the Joker's abuse, suggesting she'd happily kill him if given the chance. Only, she doesn't appear interested in finding him. This could be because she doubts her independence is entirely true. Harley knows better than most how dangerous the Joker is. If she were to see him again, she may doubt her ability to defy his manipulation. This could fuel her desire to kill those who exhibit red flags - temporary replacements for her ex, until the day when she finally battles him.
The Joker is extremely jealous, ready to destroy any shred of happiness Harley finds without him. So where is he? Leto's Joker future undetermined and prior films abandoned.
In 2016's Suicide Squad, Harley fantasized about a normal life with the Joker. She has thankfully moved past this futile dream, but it's possible she isn't fully over him. Maybe Harley saw something genuine during their relationship that is yet to be explored, and this could ultimately be used to destroy him. Her precise feelings about him are uncertain, and her evolution will be incomplete without a confrontation. Until Harley Quinn kills the Joker, he poses a threat to her personal growth, always haunting her story.
