If you were offered the role of the villain or the hero in a movie, which role would you accept and why? Remember to keep within the 500-word maximum length.

I am a villain. How can I say that about myself when, to the casual observer, I am a quiet, introverted girl? What makes me such a bad person? As someone who has been known to fight for others, how does that make me a villain? I want to see the best in everyone, and advocate for those who are lacking advocates. So, how is that villainous?