I've seen very few fan art pairings of Harley Quinn And The Deedees, so you'll have to deal with my crappy take on the subject. I love Harley, and since the Deedees from Batman Beyond: Return Of The Joker turn out to be Harley's granddaughters, I always thought a great follow up to have the Deedees steal and new device which restores youth permanently, and use it to make Harley young again and stop themselves from aging and bam, Harley Quinn is on the loose again. Except the device has the side effect of making them all considerably crazier then they were before . . .