Persona (noun)

1. The aspect of someone's character that is presented to or perceived by others.
2. A role or character adopted by an author or an actor.

Origin:

New latin, from latin, mask worn by an actor, character played by an actor, from personare to sound through, speak through, from person-, persona mask.

Examples:

1. She has a different persona in the office than she does at home.
2. The persona he presents to the public is very different from his true self.
3. The actor's persona on stage was very convincing.
4. The persona adopted by the singer on stage is very different from his personal life.
5. The persona of the protagonist in the play is complex and multi-faceted.