If you’re one of those people who lives to create show-stopping couples costumes with your S.O. every year, then you’re in luck, because Harley Quinn and the Joker from Suicide Squad are the couple of the year, with their oddly heartfelt, twisted unity. Especially thanks to Joker 2 (okay, I know it’s not the same Joker and Harley Quinn, but anything is possible in the multiverse, right?) These two each have a chaotic history individually, but when the stars aligned to create their serendipitous love story, we couldn’t help but have a little empathy and fall in love with this quirky, villainous…