INTP here. I'm fascinated with MBTI, and I'll explain the INTJ type a little bit:
I= Introversion. The best and most interesting people you know, dwells inside your head.
Ni= Introverted Intuition. Dominant function in INTJ's. It's a subconscious function, gives you a sense of focus and probability in an abstract way. "This shit WILL happen".
Te= Extroverted Thinking. Secondary function, it's a conscious function, gives you the ability to invent things related to your environment.
Fi= Introverted Feeling. Conscious function, gives you the sense of a strong internal conviction based on very personal values.
Se= Extroverted Sensing. The shadow function in INTJ's. It's a subconscious function, is repressed by the Ni, and enables you to catch instant concrete details from the environment.
J= Judging. Narrow your decisions to small options and drives you to act upon the environment.
Ni, Fi and J makes an INTJ a very very focused person, a person who cannot procrastinate, it's a person who needs to action. Sometimes INTJ's can be very paranoid.
A good example of a fictional INTJ is the Ozymandias from Watchmen. Dr. Manhatan is an INTP.
Batman is an INTJ too. Spider-man is an INTP.
Issac Newton was an INTJ. Eistein is the quintessential INTP.
This world is the best place for ESFJ's and ESFP's. They are the vast majority of people.
INTJ's and INFJ's are the rarest, followed by INTP's. The 3 together made aprox. 5% of the world population.
INTJ's are super strategists and INTP's deeper analysts.