Personator is a word that describes a person who impersonates or imitates someone else. While it's a fairly uncommon word, there are several synonyms that can be used in its place for better clarity and understanding. For instance, an impersonator is someone who mimics the behavior, mannerisms, and/or appearance of another individual. A doppelganger is someone who resembles another person, either eerily or strikingly. A mimic is a person who can imitate or replicate the voice of another individual. An imitator is someone who can recreate another's style, behavior, or talent. Finally, a copycat is someone who closely duplicates another individual's actions or behavior.