(This follows the movie) Y/N aka Sadis short for Sadistic. They call her that because of her sadistic habits when she gets violent after the other side of her gets out. Y/N had a long road ahead of her when Harley and Joker adopted her from Arkham Asylum, when they left one night the bat broke in but the teen escaped, she had made friends with Killer Croc, before they were both caught and sent to Belle Rebe penitentiary. All hope was lost....till Amanda Waller showed up. Taking her and her heathen friends for a ride.