Personality type - ISTP... The Psycho Vigilante

Right just to recap, below is a link to the test:-
http://www.humanmetrics.com/cgi-win/JTypes2.asp
 ...and a break down of how common the 16 types are:- 

ISTJ 11–14%	ISFJ 9–14%	INFJ 1–3%	INTJ 2–4%
ISTP 4–6%	ISFP 5–9%	INFP 4–5%	INTP 3–5%
ESTP 4–5%	ESFP 4–9%	ENFP 6–8%	ENTP 2–5%
ESTJ 8–12%	ESFJ 9–13%	ENFJ 2–5%	ENTJ 2–5%

The ones that are stuck through have already been covered.

ISTP

(introversion, sensing, thinking, perception...the Psycho Vigilante

According to Myers-Briggs, ISTPs excel at analyzing situations to reach the heart of a problem so that they can swiftly implement a functional repair, making them ideally suited to the field of engineering. Naturally quiet people, they are interested in understanding how systems operate, focusing on efficient operation and structure. They are open to new information and approaches. But contrary to their seemingly detached natures, ISTPs are often capable of humorously insightful observations about the world around them. They can also be closet daredevils who gravitate toward fast-moving or risky hobbies (such as bungee jumping, hang gliding, racing, motorcycling, and parachuting), recreational sports (such as downhill skiing, paintball, ice hockey, and scuba diving), and careers (such as aviation and firefighting).

ISTPs may sometimes seem to act without regard for procedures, directions, protocol, or even their own safety. But while their approach may seem haphazard, it is in fact based on a broad store of knowledge developed over time through action and keen observation. ISTPs enjoy self-sufficiency and take pride in developing their own solutions to problems.

ISTPs are content to let others live according to their own rules, as long as the favor is reciprocated. ISTPs endure reasonable impositions without complaint—but if their "territory" is encroached upon, eroded, or violated, they defend what they view as rightfully theirs.

In Relationships

ISTPs are generally extremely capable individuals who are good at most things which interest them. They are usually bright, interesting, and exciting individuals with a lot to offer. They live almost entirely in the present moment, and usually do not make commitments beyond the immediate foreseeable future. An ISTP probably coined the phrase "nothing is unconditional". They strongly prefer to take things one day at a time, rather than make long-term commitments. If a relationship interests them and satisfies their needs, the ISTP will do their part on a daily basis to keep the relationship strong and healthy. If they lose interest in a relationship, their natural tendency will be to move on.

Ten Rules to Live By to Achieve ISTP Success

1. Feed Your Strengths! Realize your gift at mastering your physical environment, and give yourself plenty of opportunities to exercise your abilities. Ride, play, paint, work it. Much of your sense of well-being will come from these experiences.
2. Face Your Weaknesses! Face your fear of the unknown, and get yourself into new situations. Experience new activities and people with new perspectives. Don't isolate yourself into a narrow and lonely existence.
3. Talk About Your Thoughts. Discussing your ideas and perceptions with others will help you to develop your Extraverted Sensing, and thus your understanding of the world. How well you use your auxiliary function is very important to your overall health and happiness.
4. Don't Be Afraid to Love. That's just your old inferior function trying to convince you that you're unloved and unloveable. It's not true. Just because you're not sure what to do with yourself doesn't mean that you can't learn! Go on... jump in. The water's warm.
5. Respect Your Need for Action. Understand that you need to be actively working with your environment to be "in the groove" with life. Don't chastise yourself for not being the sort to sit around and read a book or watch a movie. Choose a partner and companions who value active lifestyles.
6. Recognize Social Principles. Realize that our society functions around some basic social principles, and that our society would fail unless those principles are recognized and upheld. In a democracy, people vote. At a red stoplight, people stop. If people stopped voting because it wasn't important to their own way of life, who would be in power? If people stopped stopping at red stop lights because it didn't fit into their way of life, how could we drive safely? Your priorities and beliefs are important, but you must recognize that the external world's agenda is also important. Don't dismiss the importance of principles that don't affect your life directly.
7. It's OK to Get Out of your Comfort Zone. Understand that the only way to grow is to get outside of your comfort zone. If you're uncomfortable with an idea or situation because you're not sure how to act, that's good! That's an opportunity for growth.
8. Identify and Express Your Feelings. You may have a hard time figuring out exactly how you feel about someone that you're involved with. It's important that you do figure this out. Don't lead someone on with your ambivalence. If you determine that you value the person, tell them so every time you think of it. This is the best way to make them feel secure in your affections, and so to promote a long-lasting relationship.
9. Be Aware of Others. Try to really identify where people are coming from. Their ideas, thoughts and priorities are differents from yours. They have something to offer you. Try to identify their personality types.
10. Assume the Best. Don't distress yourself with fear and dark imaginings. Expect the best, and the best will come.