protagonist
pro.tag.o.nist \pro--'tag-*-n*st\ n [Gk pro-tago-niste-s, fr. pro-t- prot- + ago-nist]e-s competitor at games, actor, fr. ago-nizesthai to compete, fr. ago-n contest, competition at games - more at AGONY 1: one who takes the leading part in a drama, novel, or story 2: the leader of a cause : CHAMPION 3: a muscle that by its contraction actually causes a particular movement