protagonist

The main character in a drama or other literary work.

In ancient Greek drama, the first actor to engage in dialogue with the chorus, in later dramas playing the main character and some minor characters as well.

A leading or principal figure.

The leader of a cause; a champion.

A proponent; an advocate.

In the Gr. drama, the leading character or actor in a play; hence, in general, any leading character.

One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like.

The main character in a any story, such as a literary work or drama.

A leading person in a contest; a principal performer.