William Pratt

William Pratt also known as the Hashtag Killer or '''Mirror Man. '''He is the main antagonist that appears in the Hashtag episode of the tenth season of Criminal Minds.

Biography
Pratt lost his very young parents in a car accident and was sent to live with his aunt. This is also very likely to have marked you forever and triggered a different behavior. Some time later, he helped his friend create a creature Creepypasta called Mirror Man that became famous, but Pratt was not satisfied, and was deseperate to gain fame and please Connor whom he saw as a mentor. So he became a killer to become the real life Mirror Man.