Trickster

The Trickster is the name of two DC Comics supervillains that are both enemies of the Flash. The original Trickster first appeared in Flash #113, while the second debuted in Flash #183. Both have been members of the Rogues. The character has been substantially adapted into television productions of DC Comics work. Actor Mark Hamill is most closely associated with the role, having played the character in two live-action adaptations of The Flash and even voiced the character in animated form for the series Justice League Unlimited.