• Protagonist:- Central character or leading character of a play.- নাটকের কেন্দ্রীয় চরিত্র। • In other words:- The leading character, hero, or heroine of a drama or other literary work.- A proponent for or advocate of a political cause, social program, etc.- The leader or principal person in a movement, cause, etc.Source: Website lecture & Cambridge Dictionary grammar reference.