Pied Piper (CW)
Real name: Hartley Rathaway
Full name: Hartley Rathaway
Aliases: Pied Piper
Creator: DC Comics
Alignment: Good
First appearance: The Flash Season 1: Episode 11
Occupation: Physicist
Base: Central City
Relatives: Osgood Rathaway (father), Rachel Rathaway (mother)
Gender: Male
Race: Metahuman
Height: 5'8" • 173 cm
Weight: 183 lb • 82 kg
Eye color: Blue
Hair color: Brown
Superpowers: Audio Control, Energy Blasts, Enhanced Hearing, Intelligence, Intuitive aptitude, Weapon-based Powers
Stats: intelligence 100, strength 10, speed 20, durability 15, power 55, combat 65

History:
Hartley Rathaway, self-styled as Pied Piper, is the son of Rachel and Osgood Rathaway. A former employee of S.T.A.R. Labs, he was fired by Harrison Wells (Eobard Thawne in disguise) for trying to stop the activation of the Particle accelerator, which he'd discovered was at risk of exploding. After being affected by the particle accelerator and gaining the ability to hear at superhuman levels, Hartley attempted to get revenge on Wells for firing him by trying to kill Barry Allen/The Flash, believing Wells to have replaced him with the Flash. After being defeated by Barry and Wells, Hartley was re-incarcerated, having planned his capture and escape the first time as part of his revenge plan, but not this time. However, he knew the whereabouts of Ronnie Raymond, and Cisco reluctantly worked with Hartley to find Ronnie and succeeded. Nonetheless, Hartley used this opportunity to escape. In an altered timeline, Hartley's revenge was interrupted by the appearance of a Time Wraith, but worked with Team Flash to defeat it. As a result of the timeline change, Hartley made amends with Team Flash and became an ally of the team, even knowing Barry's secret, and made up with his parents.

Powers:
 After Hartley was struck by the energy of the Particle Accelerator explosion, this altered his DNA and supercharged his cells, augmenting his physiology to enhance his ears.  After surviving the S.T.A.R. Labs particle accelerator explosion, Hartley gained the power of superhuman hearing. It allows him to hear far better than a normal human. He is also able to hear radio waves and distinguish their frequencies.   Hartley is a genius of the highest caliber and is described by Eobard Thawne, impersonating Harrison Wells, as one of the most brilliant minds he has ever met. Hartley even found out Wells' "dark secret", concerning the particle accelerator instability. Nevertheless, despite Hartley's superior intellect, it is highly unlikely that he saw through Harrison's/Eobard's entire master-plan, namely his intention to create the Flash from the particle accelerator explosion and exploit the latter's connection to the Speed Force to return to his own time. Hartley also possesses a keen, tactical mind able to keep his enemies guessing what the endgame is until it is too late.  Hartley is a capable computer hacker, he was able to hack into the computers from S.T.A.R. Labs to create a means in which to kill the Flash; that matches Barry Allen's speed frequency.  Hartley is skilled enough in engineering to make a pair of sonic gloves from scratch.  Hartley is capable of fluently speaking at least six languages, including English, Spanish, French, Latin, and Japanese.  While unknown to what degree, Hartley is aggressive in a fight. Despite being handcuffed at the time, Hartley was able to fight off Cisco and initially escape his captor before Cisco activated a rigged setting on Hartley's earpieces.