Reverse-Flash

"Oh I'm not like the Flash at all. Some would say I'm the Reverse."

- Man in yellow

An unidentified man often referred to by such names as the "man in yellow", the "man in the lightning" is the murderer of Nora Allen, and an apparent metahuman.

Biography
Almost nothing is known of Reverse Flash including his real identity or motives. In 2000 he circled Nora Allen in a blur, before presumably stabbing her directly in the heart with a knife. He took her son Barry blocks away and made it seem to the police as if her husband Henry had murdered her. It was speculated by Cisco after observing Barry and the Reverse Flash fighting each other that there were actually two superspeed metahumans fighting that night at Barry's house, not the Reverse Flash.

In 2014, he reappeared and threatened the life of Joe West's daughter Iris by stabbing a similar knife into her photograph, to scare Joe away from investigating Nora's murder.

Powers and abilities

 * Superhuman speed: This man moves and reacts at inhumanly fast speeds that are incomprehensible and undetectable, allowing him to dodge any attack, travel anywhere around the world instantly, and land multiple hits on someone before they can react. He's significantly faster than the Flash currently, leaving the younger speedster barely able to keep up with and register the man's movements.
 * Rapid cellular regeneration: As noted by Dr. Wells, this man - like Flash - is able to rapidly heal himself from most injuries, making him very hard to be kept down for long should he be hurt.
 * Extreme force generation: By building up enough kinetic force in his body, this man is able to deal very punishing blows. Even Flash with his accelerated healing was quickly pummeled to the point he was unable to fight back.
 * Skilled Hand-to-Hand Combatant: Whereas Flash relies primarily on his reflexes and speed to overwhelm his slower opponents with random striking, this man is shown to be a very methodical fighter, striking at precise spots to systemically wear down his opponent.

Trivia

 * The man in yellow resembles the suit worn by various characters called the "Reverse-Flash" (first "Professor Zoom", then "Zoom"), villains who share the Flashes' super-speed. Eddie Thawne shares a similar name to the Reverse-Flash's true civilian name Eobard Thawne, but whether this is intentional or coincidence is unknown.
 * It has been revealed that Harrison Wells is in possession of a suit seemingly identical to the man in yellow's, and is able to change his voice similarly. It is unknown if Wells is the Reverse-Flash or if he's working with him, or if the one beating him up was a decoy and he's the real man in yellow or not.
 * When Reverse-Flash escapes the force field, he kills the whole SWAT team at S.T.A.R Labs but mysteriously spares Eddie and stares at him for a few seconds (a very long time, relatively speaking), which is notable because Eddie Thawne is believed to be Eobard Thawne who is Professor Zoom. But he's likely to be a descendant of Eddie from the most distant future.