noun (n)

• a person who backs a politician or a team etc.(noun.person)

  Synonym:
  admirer, booster, champion, friend, supporter
  

  source: wordnet30
• the principal character in a work of fiction(noun.person)

  Synonym:
  agonist
  

  source: wordnet30
• One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like.(noun)

  source: webster1913