My personal favorite personality test is the Myers Briggs. It factors in enough elements that it offers 16 different personality types. For the level of specificity in can offer, I think it does a good job.
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The test offers four areas of comparison.
Extraverted or Introverted – Are you energized by the outside world, or by quiet time alone?
Intuitive or Sensing – Do you think in terms of concepts and ideas, or facts and reality?
Feeling or Thinking – Do you value cooperation with others, or personal competence?
Judging or Perceiving – Do you like to follow a plan, or go with the flow?
EXTRAVERTED VS. INTROVERTED
INTUITIVE VS. SENSING
FEELING VS. THINKING
JUDGING VS. PERCEIVING
I AM INTP OR INTJ (but probably INTP)
INTPs are philosophical innovators, fascinated by logical analysis, systems, and design. They are preoccupied with theory, and search for the universal law behind everything they see. They want to understand the unifying themes of life, in all their complexity. INTPs are detached, analytical observers who can seem oblivious to the world around them because they are so deeply absorbed in thought. They spend much of their time focused internally: exploring concepts, making connections, and seeking understanding. To the Architect, life is an ongoing inquiry into the mysteries of the universe.
I AM YODA! …or sometimes The Emperor.