If you like the MBTI, I'm an INTP or INTJ. Ok, the MBTI is not science, but just to decribe myself.
I decided to make a list of those I consider my greatest qualities and my greatest defects, just to warn any reader :P
Qualities: intelligence, honesty, sense of humor, open-mindedness.
Defects: laziness, a bit of selfishness (for unimportant things), pride/a bit of hubris; also, many could find me a socially awkward loner.
Also, I am very private, so if you don't find much in my profile it's likely for that reason. If you want to know about me, ask.