Protagonist (noun) ممتاز شخص، جیالا، مداح

the leading character or one of the major characters in a play, film, novel, etc.
Example: “the novel’s main protagonist is an American intelligence officer”
Synonyms: supporter, upholder, adherent, backer, proponent, advocate, promoter, champion
Antonyms: opponent
Interlocutor (noun) مکالمے میں حصہ لینے والا

a person who takes part in a dialogue or conversation.
Example: My interlocutor and I had a productive conversation
Synonyms: interrogator., interviewer., questioner., speaker., talker., dialogist,
Antonyms: Monologuist, Audience, Silent listener