Shade.

About Shade

The Shade is a comic book character developed in the 1940s for National Comics, first appearing in the pages of Flash Comics in a story titled "The Man Who Commanded the Night", scripted by Gardner Fox and illustrated by Hal Sharp. Debuting as a villain, the Shade was best known for fighting against two generations of superheroes, most notably the Golden Age and Silver Age versions of the Flash. He eventually became a mentor for Jack Knight, the son of the Golden Age Starman, Ted Knight, a hero the Shade had also fought.