Harley Quinn’s story has always been a love story. Since her first appearance in “Batman: The Animated Series” in 1992, the psychiatrist turned pinwheeling hellion has always overflowed with spirit, smothered those around her with affection, offered up her heart on a silver platter even when she knew she was offering herself up to get crushed. Harley’s story has also always been entangled with that of the Joker, the Batman universe’s most iconic and sophomoric villain, who twisted her into a stranger shape and treats her like a particularly annoying stray dog. For years, Harley’s complete devotion to the chronically careless Joker was her most defining characteristic.