For comic book fans and cosplayers who love Harley Quinn and all of her stylish colorful outfits, we compiled a helpful list of costume ideas featuring the best Harley Quinn costumes for 2021! Her notoriety is not necessarily due to her stylized harlequin outfit or her complex personality that fuels her unconditional toxic love for the Joker. The show will also make way for Barbara Gordon, former Batgirl turned Gotham City Police Department commissioner, as well as Dr. Jonathan Crane, scarlet witch costume aka Scarecrow.