Here they are again with a hooked friend. Here she is with another cosplayer. She eventually quits her job at the hospital to work full-time as the Joker’s new sidekick, adult power ranger costume Harley Quinn. The Harley Quinn is a great selection for your Halloween costume this season. This costume is the absolute cutest! Black Panther wins coolest costume hands down. We’re going less for technical accuracy and more for what’s nifty and won’t make us bake at the end of August.