Find great deals on eBay for injustice costume. Gods Among Us Harley Quinn Cosplay Costume Injustice: Gods Among Us Harley Quinn Cosplay Costume. Looking to unlock all of the alternate costumes in 'Injustice: Gods Among Us'? Here's a complete list and guide - along with a video of all the skins in action. Injustice: Gods Among Us is a fighting video game based upon Bane; Batgirl a; Scorpion's appearance in Injustice featured a new costume design by comic.