antagonist -> adversary of the hero or protagonist of a drama or other literary work
archetype - original pattern or model
character - person in a novel, play, etc.
hero - the main typically male character in a story, play, etc.
heroine - main female character in a story, play, etc.
muse - the inspiration motivating a poet, artist, etc.
protagonist - the main character
pseudonym - fictitious name used by an author to conceal his or her identity; pen name