The Joker and Harley Quinn's relationship has deteriorated significantly, and the two are just as likely to fight as anything else. There was a time, of course, when the Joker had Harley under his thumb, but she broke free. She's become a premiere hero in the DC Universe, even joining the Bat-Family. She's proven to be a wily combatant, one who can handle a variety of threats.
The Joker is no slouch himself, though, and a no holds barred battle between the two would be an entertaining affair. There can only be one winner, and each combatant has a good chance of defeating the other.
11 Harley Quinn Wins: Poison Ivy Is Far Away From Harley
Poison Ivy is Harley Quinn's girlfriend, and the two are inseparable. However, Ivy is also more powerful. Quinn is more skilled and knows more about weapons, but Ivy is connected to the Green. That power gives her a wide range of options that Harley doesn't have and makes her the muscle of the duo.
Quinn would want to deal with the Joker alone, but Ivy would stay close. There's nothing more that Ivy would like to do than hurt the Joker for what he did to Harley over the years, and she would go out of her way to help the woman she loves.
10 The Joker Win: He Knows Harley Better Than She Knows Him
The relationship between Harley and the Joker was very one-sided. Harley loved the Joker, but he used her. She opened up to him, and he knew her very well. Even with the potential that she's changed, the Joker understands Harley, who she is, and how she does things. On the other hand, Harley really only knows the Joker on a surface level.
Where the Joker would be able to predict Harley's actions and how she'd handle certain things, she couldn't do the same to him beyond the simplest of levels. That will make a lot of difference in a battle between them.
9 Harley Quinn Wins: She Won't Fall For His Tricks
Harley may not have a deep understanding of the Joker, but she knows his MO. The Joker is known for several things, but the two biggest are hyper-violence and an ability to surprise his foes. This isn't going to daunt Harley much. If anyone knows how tricky the Joker is, it's Harley.
Harley would know when Joker was laying a trap for her or had something else sneaky planned. She'd understand better than to fall for the little gambits he likes to pull out against his foes. Joker wouldn't be able to trick her, which takes away a portion of his offense.
8 The Joker Wins: He Knows How To Manipulate Harley
The Joker is a master of manipulation. That skill is the only reason he ever got Harley in the first place. Harley has done her best to get past the scars of what the Joker did to her, to be strong enough to overcome his hold on her. However, the Joker knows just what tricks to use against Harley to get her.
Abusers can permanently damage the people they've abused. Trauma goes deep, and it's impossible to overcome completely. Harley has done a lot to change and improve, but the Joker knows how to bring all of that back and wouldn't hesitate to do so.
7 Harley Quinn Wins: She Punches Way About Her Weight Class
Lots of things have gotten better about Harley since she left the Joker. The most notable one, mainly regarding fighting, is how much tougher she's gotten. Harley has defeated a who's who of the DC Universe, earning a fiercer reputation than she had as Joker's henchwoman. That's going to help her a lot in battle against the Joker.
As the Joker knows Harley, he's not expecting her to be as challenging as she is. Joker will underestimate her and try to fall back on what he knew about her to win. He's going to learn that's a big mistake.
6 The Joker Wins: His Gases And Poisons Are Hard To Counter
The Joker's worst attacks on Gotham all involve his love of pathogens. From his various Joker gases to viruses he's created to the poisons he keeps multiple weapons coated with, the Joker loves to use these types of attacks. He's immune to them, but his foes aren't, which means they're a great way to get an advantage over a foe.
Harley is smart enough to know that the Joker will try to use one of his numerous pathogens against her. The problem is she doesn't know how or when. This will be a big problem for her, as he can wait until she's in close, let off a Joker gas grenade, and watch her die.
5 Harley Quinn Wins: She's Still Cruel
Harley Quinn fit in so well with the Joker because of her capacity for cruelty. Harley could be just as bad as her former boss when the fancy struck her. She's reformed and is ostensibly a good guy, but one thing that hasn't changed is her cruelty. Harley doesn't suffer fools, and she doesn't treat enemies with kid gloves.
If the Joker goes into the battle expecting a softer Harley, he's in for a rude awakening. She will not take it easy against him because she's now a hero, and he will learn that she remembers everything he taught her. Furthermore, Harley has a lot of anger at the Joker banked up and would unleash it all against him.
4 The Joker Wins: There's No Length He Won't Go To
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Joker is evil incarnate. As cruel as Harley can still be, she has nothing on the Joker. It's what makes him such a challenging foe to beat. The Joker is known for doing the most terrible things imaginable. What's so frightening about him is the impression that he's only scratched the surface of the depravity in his mind.
The Joker's drive to do the worst things possible lends him a strength he otherwise wouldn't have. This is a man who can punch it out with Batman when he needs to. He'll do anything to win, and nothing stops him.
3 Harley Quinn Wins: She's Grown In Ways He Can't Imagine
Harley Quinn has proven herself as a great hero. She's no longer the mentally dominated lovesick fool the Joker made of her. She's taken her pain and made it better, letting it fuel her present instead of dragging her back into the past. The Joker will expect a familiar Harley, and get a huge surprise.
Harley is better in every way than the woman the Joker expects, which will make a huge difference. She can surprise him in unexpected ways and teach him the lesson he's always needed to learn.
2 The Joker Wins: He's Chaos Personified
The Joker is the most confounding villain because of who he is. The Joker is chaos personified. There's no way to know what he's going to do next. Even the people who know him the best can't say for sure how or where he'll strike. He's survived for so long because he can stay one step ahead of everyone else.
Harley may think she knows the Joker, but he's never going to do anything in a way she'd expect. He's smart, and he's been doing this a long time. Harley is better than him in a lot of ways, but he's going to surprise her.
1 The Winner: The Joker Has her Number
Harley is much better than she used to be, but so is the Joker. His unpredictability and willingness to do anything to win will give him an advantage she can't overcome. He'll take advantage of her trauma, brutalize her, and finish her off with one of his patented Joker toxins.