n.a protagonist who lacks the characteristics that would make him a hero (or her a heroine)
英汉双解大词典
antihero/ˈæntɪˌhɪərəʊ/(antiheroes)
1.
N-COUNT（可数名词）
An antihero is the main character in a novel, play, or film who is not morally good and does not behave like a typical hero. 不符合典型的英雄举止的主角