Harley Quinn promises a thrilling show, and after a lot of searching, it's no surprise that this carefree, shiny badass, known for years as the Joker's girlfriend, has won our hearts. By the way, it is quite interesting to dive into the full history of Suicide Squad. This is how we created this insanely iconic character that sits at the top of our list of funniest costumes. So, do-it-yourself harley Quinn Halloween costume, as well as her hairstyle and makeup in our master class.