Marjane seems more like an extrovert. If you read the graphic novels and watch/read her interviews, you will see a more extroverted and abrasive side .. I understand though why she comes off as introverted. In the movie she seemed depressed all the time.
I thought this was a great movie, I just saw it last week.
I thought Marjane was ENFP though...
You'd have to be one lucky bastard or really dense to go through what she went through and not be depressed!