I don't mean by being supporting characters, but being characters with leading roles. Imagine Ronda Rousey starring in an action movie.
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The viewership of most action movies are men, thus most of the protagonists and antagonists are going to be men. That's not to say a woman couldn't pull it off, but it'd be tough to imagine most actresses being able to accomplish the believability of this.
Ronda Rousey could be a believable badass character, but I've never seen her act, so I don't necessarily know how well she'd do in a film.0