Noun protagonist has 2 senses
  1. supporter, protagonist, champion, admirer, booster, friend - a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library"
    --1 is a kind of advocate, advocator, proponent, exponent
    --1 has particulars:
     anglophile, anglophil; believer, truster; Boswell; cheerleader; Confederate; enthusiast, partisan, partizan; Francophile, Francophil; free trader; functionalist; Jacobite; loyalist, stalwart; New Dealer; philhellene, philhellenist, Graecophile; pillar, mainstay; Roundhead; seconder; Shavian; subscriber, endorser, indorser, ratifier; sympathizer, sympathiser, well-wisher; toaster, wassailer; upholder, maintainer, sustainer; voucher, verifier; Whig
  2. protagonist, agonist - the principal character in a work of fiction
    --2 is a kind of fictional character, fictitious character, character
    --2 has particulars: antihero
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