Who plated casper the friendly ghost?

Well first I'm going to assume you're asking who *played* Casper. In which case, there are several answers, for as I'm sure you can guess, there have been several incarnations of Casper over the last 60 years or so. In the 1995 movie (starring Christina Ricci and Bill Pullman), an animated Casper was voiced by URL1 Malachi Pearson.

He also continued his work on the short-lived Casper tv series that followed. Devon Sawa (the perpetual open-mouth breather) played a pre-teen Casper come-to-life very briefly in the movie. But back in the 50s and 60s at the height of Casper's popularity, Norma MacMillan, Cecil Roy, Mae Quitzel, and Julie-McWhirter all gave Casper his voice.

If so this the info I got from Wikipedia: Actors to play Casper Cecil H. Roy voiced Casper in the majority of the Famous Studios cartoons along with Mae Quiztel. Casper was voiced by Norma MacMillan in The New Casper Cartoon Show, by Julie McWhirter-Dees in the Hanna-Barbara cartoons, by Malachi Pearson in the 1995 movie Casper and The Spooktacular New Adventures of Casper, by Jeremy Foley in Casper: A Spirited Beginning and Casper Meets Wendy, by Brendon Ryan Barrett in Casper's Haunted Christmas and by Devon Werkheiser in Casper's Scare School.

Devon Sawa is the only actor to play the character in live-action, portraying him in a sequence from the 1995 film in which Casper was temporarily brought back to life.

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