Definitely introvert, I enjoy spending time alone and I don't talk much to people, specially people I've just met - I generally avoid too much social interaction and enjoy being left alone. I become more extrovert with people I trust in, but that's it. My friends already know I don't talk unless I've got something important to say, so they don't bother me and force me to talk. Despite this, I successfully took a course in public speech and public debate (competitive).
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you