Alter ego

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An alter ego (from Latin, "other I") is another self — a second personality within a person. It is also called leading a double life.

For example, in The Strange Case of Dr Jekyll and Mr Hyde, Mr. Hyde was Dr. Jekyll's evil alter ego (same person, different personalities).

The term is also used in popular fiction, like comic books, for the secret identity of a superhero, vigilante or crimefighter:

And sometimes an artist uses an alter ego, like: