Wiliam Hayes, or "Billy" in his younger years, was always the troubled sort. Displaying signs of violence into his adolescence, Billy was soon acquainted with the demon Buzz, who promised him unlimited power in exchange for an innocent soul. After Billy dabbled in tribal face paint and the murder of his younger sister, he became Harm, a supervillain-in-training who decided he was going to be the world's greatest murderer. Coming to National City to start off his next killing spree, he encounters two members of TITANS...
(Sadistic and a sociopath through and through, Harm cares for only one thing: bloodshed. He is darkly satisfied with hurting people, and anyone who gets in his way is as good as Greta. See what I did there?)