Eobard Thawne (Arrowverse Earth-One)

Professor Eobard Thawne, also known as the Reverse-Flash, is a time-traveling criminal from the 22nd century, and the archenemy of The Flash.

History
Professor Eobard Thawne, born on September 1, 2151, was obsessed with The Flash. He spent years figuring out how he came to be, and after managing to duplicate the process that granted the speedster his powers, he successfully managed to gain a connection to the Speed Force. However, he subsequently discovered, through time travel, that he was destined to become The Flash's greatest enemy, and would never become him, causing Eobard to despise his former idol. Becoming the Scarlet Speedster's "reverse", Eobard would then make it his life's mission to take as much as he can from him, travelling through history in order to find the time period the Flash is from and learn his name.