Synonyms of 'protagonist'
a supporter of a causean active protagonist of his country's membership of the EU
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in the sense of advocate
a person who upholds or defends a cause or course of action
He was a strong advocate of free market policies.
in the sense of exponent
a person who advocates an idea, cause, etc.
a leading exponent of genetic engineering
Thesaurus for protagonist from the Collins English Thesaurus