Mark Hamill

Mark Hamill portrayed multiple versions of James Jesse/The Trickster in (CBS) and  (The CW).

Trivia

 * After the 1990 Flash television series, Hamill voiced The Trickster in the "Flash and Substance" episode of Justice League Unlimited, where the animated character design blends elements of Hamill's costume (mainly the multicolored hair; Trickster is blond in the comics) from the series with the character's classic comic-book design; the animated version's facial features even suggest those of Mark Hamill. He would reprise the role in other DC projects, such as Justice League Action.
 * Mark Hamill is most notable for his role as Luke Skywalker in Star Wars, which was indirectly referenced in The Flash "Tricksters" episode. Outside of Star Wars, Hamill has voiced The Joker in various DC animated and video games productions, starting with Batman: The Animated Series.