protagonist (protagonists plural )
1 n-count Someone who is a protagonist of an idea or movement is a supporter of it.
FORMAL
(=proponent) (Antonym: opponent)
...the main protagonists of their countries' integration into the world market.
2 n-count A protagonist in a play, novel, or real event is one of the main people in it.
FORMAL ...the protagonist of J. D. Salinger's novel `The Catcher in the Rye'...