From an empirical point of view:
Charles Chaplin
Peter Sellers (The master of characters. It is pure joy to see him work.)
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Rowan Atkinson
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Tom Green -> https://www.youtube.com/watch?v=haVXS9rMNxI
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Jim Carrey
Robin Williams -> https://www.youtube.com/watch?v=LcSKrOlnofk
Bill Murray
John Belushi
Benny Hill
Eddie Murphy
Leslie Nielsen
Sacha Baron Cohen
Steve Martin
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Mike Myers
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Will Ferrel