How do you imagine a totally healthy and a totally unhealthy INTJ?
According to many other MBTI aficionados, I am the prototype of an unhealthy INTJ. I suppose the most recent news involves a class (in graduate school) where I briefly summarized a women's argument and then told her that she sounded like she was on George Bush's payroll. This prompted attacks from all angles, and gave others who had pent up resent a pretext to abandon reason in favor of trying to destroy me. However, I never say anything that cannot be defended (if not with sources and evidence then with sheer logic) so as to stand the counterargument of others on their heads. This, combined with the maxim I established when I was six years old which is that no human word would ever reach me, has made the opinions of others inpenetrable. The only thing I respond to is logic and reason. A professor can blabber on all day, while a 5 year old can say something quite sensible and logical that makes me listen. This is because I value logic and reason more than people and titles. I have not quite found a good substitute for Fi. I find that it is good to watch a few comedies one or twice a year to learn some jokes and socially attractive behavior that can be useful in diplomacy. However, the approach I take to diplomacy is the same chess-like approach I take to everything else. Every so often I meet a special women and my Fi comes out, which is probably quite remarkable from the point of view of an earthbound person.
I like to think that there are the "Te-bound" and "Ni-Fi-free" subtypes. I find the Te-bound types rather intolerable because they almost seem to fear their greatest potential strength which is Ni. Everything has to be so logical that it drains from any human element, which is great and all for certain applications, but if they embraced their Ni-Fi they'd see Te has limited application to social matters. The Ni-Fi types give the vibe of being an intuitive first and foremost with the ability to apply thinking or feeling where pertinent. I'd say they present a more engaging and intriguing vibe to others rather than a domineering or intimidating one. People might mistakenly type them as something else because the stereotype of INTJ is one of an uptight, logical jerk, but I think that's ill-founded and only propagated because the sample from which the notion is extrapolated seems to have very undeveloped Fi.
I think a well-developed INTJ displays strong Fi: a strong sense of self, the ability to judge the worthiness of ideas, and the ability to actually empathize with others.
Unhealthy ones don't do that last part quite as well which is a shame because it really detracts from this goal of utility and pragmatism that drives them.