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31. Kenan Thompson (2003-present)
While he's created memorable character including DeAndre Cole, host of the BET program "What's Up With That," Thompson's been able to shine with celebrity impersonations, including everyone from Charles Barkley and Steve Harvey to Bill Cosby and Whoopi Goldberg. He's also the senior member of SNL's current cast, and holds the record for longest-running African-American cast member.