A person who practices mimicry, or mime.
"The street performer asked the crowd if anyone wanted to see him in his old days as a professional mimic before he started doing comedy."
To imitate, especially in order to ridicule.
"The comedian's act consisted of mimicking his boss's voice so poorly that everyone had to laugh at how ridiculous he sounded."
Pertaining to mimicry; imitative.
"The parrot's ability to mimic human speech perfectly amazed everyone at the market."