Board Thread:Questions and Answers/@comment-30744559-20171029094212/@comment-14660436-20171031223108

No, it really doesn't. "Main", "Major", "Supporting", "Minor" etc. do a much better job at this since it sounds far less subjective and biased from a user's point of view, but even then, these are still incredibly minor details and really don't matter as much as pinning down what makes a villain an interesting character, like their goals, motivations, actions, personality etc. Information that explain the things I mentioned is what makes people understand a villain's role.

Exhausting labels like tertiary antagonist or hidden true main antagonist or whatever are just subjective, redundant and do nothing but cause edit wars and arguments.