Impersonator

Noun

 * 1) One who fraudulently impersonates another person.
 * 2) Entertainer whose act is based upon performing impressions of others.

Synonyms

 * (one who fraudulently impersonates) impostor, imitator
 * (entertainer) impressionist, mimic, mimicker

Thesaurus
ape, artist, artiste, belly dancer, blagueur, bluff, bluffer, burlesque queen, charlatan, chorine, chorus boy, chorus girl, conformist, conjurer, copier, copycat, copyist, coryphee, counterfeiter, cuckoo, dancer, dancing girl, dissembler, dissimulator, ecdysiast, echo, echoer, echoist, entertainer, exotic dancer, fake, faker, female impersonator, forger, fourflusher, fraud, geisha, geisha girl, guisard, guiser, hoofer, humbug, hypocrite, imitator, impostor, incognita, incognito, magician, malingerer, masker, masquerader, mime, mimer, mimic, mimicker, mocker, mockingbird, monkey, mountebank, mummer, musician, nautch girl, parrot, peeler, performer, phony, plagiarist, playactor, player, poll-parrot, polly, polly-parrot, poser, poseur, prestidigitator, pretender, public entertainer, quack, quacksalver, quackster, ringer, saltimbanco, sham, shammer, sheep, show girl, simulator, singer, stripper, stripteaser, stripteuse, thespian, trouper, vaudevillian, vaudevillist

Etymology
From.