One of DC鈥檚 original Rogues, Hartley is a bona fide genius who used to work at S.T.A.R. Labs until a falling out with his mentor, Harrison Wells (Tom Cavanagh). The particle accelerator robbed Hartley of his hearing, but inspired him to create a series of sonic weapons that he uses in an effort to punish Wells by destroying his new protege: The Flash.
Pied Piper is one of the few openly gay villains in the DC Universe, and I鈥檓 told The Flash will not be shying away from that aspect of the character.