Protagonist

(n.)

1. the main character in a play, film/movie or book

（戏剧、电影、书的）主要人物，主人公，主角

2. one of the main people in a real event, especially a competition, battle or struggle

（比赛、斗争中的）主要人物，主要参与者

3. an active supporter of a policy or movement, especially one that is trying to change sth

（政策、运动的）倡导者，拥护者

(syn.) champion

e.g. a leading protagonist of the conservation movement

资源保护运动的急先锋

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