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Harley Quinn is a superb gymnast, so if you want to move like her, try working on your own skills. While you don't want to attempt anything too crazy, particularly if you've never done any acrobatics, learning something simple like a cartwheel can help you be more convincing as Harley.  A cartwheel involves standing with your feet shoulder-width apart and then flipping yourself to the side. Start by working on mats or somewhere with a soft landing place. Have someone spot you the first couple of times you try it.  If you really want to up your acrobatic game, consider finding a local gymnastic gym to learn some new skills. One of Harley's defining traits is a sense of humor that is hard to kill. Even in the most serious situations, she's not afraid to crack a joke. To be like Harley, try to use humor to diffuse situations, especially if they seem a little too serious. In fact, much like Marvel's Deadpool, she tends to poke fun at other characters in the D.C. universe. Harley is known for her outrageous personality. In fact, some have described it as "cartoonish." To be in line with this character, you've got to be willing to act a little silly, maybe even a little crazy. Harley certainly would. For instance, in "Super Power Beat Down: Joker & Harley Quinn VS Deadpool & Domino (#1.16)," Deadpool says, "Hey, cutie! Time to die!" Harley responds with, "Wait! Want to see a movie?" and then proceeds to use her cleavage to try to get out of the situation. DC actually describes Harley as "bubbly and psychotic," which is a somewhat odd combination when you take it at face value. However, it's her bubbly personality in conjunction with her villainous acts that sells the psychotic part of her personality. So play up the girly side a bit (think giggly), but don't be afraid to throw a seriously scary look at times. For instance, one quote from Harley in Suicide Squad is "What was that? I should kill everyone and escape? Sorry, it's the voices. Haha, I'm kidding! That's not what they really said."
Work on your gymnastic skills. Don't be afraid to crack a joke. Act a little over-the-top. Think psychotic cheerleader.