The Ni dominant Individual in a nutshell:
The most prominent characteristic of every single Ni dom individual is that they all suffer from a severe case of the "Snowflake" syndrome by default. This usually manifests as a propensity to extremely unique and convoluted thought patters which leads the individual to conclude he is in fact the only person capable of and experiencing such thoughts, despite the easily observable evidence that suggests otherwise. This causes the Ni dom individuals to be very withdrawn and reserved as they believe that they will never be understood and appreciated by an other human being. Indeed, such prolonged periods of self imposed isolation create a sort of a implied sense of superiority in the mind of the Ni dominant and they'll love nothing more than telling you how much of an unenlightened sheeple you are.
Ni doms are also characterized by their obstinate belief that they have figured out and cracked the entire Universe at a very early age compared to their peers.
Other types such as the INFP also suffer from the "Snowflake" syndrome, albeit the more lighter version. While INFPs think they are a highly unique individual in an ocean of other highly unique, speshul individuals, the Ni dom suffers from the delusion that they are the only Sane Man in an ocean of disgusting, fleshy, intellectually sub-par sleeple.
[A rare photo documenting an accidental encounter of more than two Ni dominants in the wild]
Living:
Ni dominates frequently suffer from various types of mental disturbances, ranging from depression to antisocial personality disorder. This is quite normal and expected as a correlation between mental disorders and the uniqueness of thought patterns has been proven. Young and unemployed Ni doms spend the majority of their free time angsting over the "fact" that they are a square peg who'll never fit into the world's round holes. The amount of time spent angsting over their Snowflake syndrome is directly proportional to the severity of whatever metal condition they've acquired. During the brief breaks between periods of crippling depression teenage Ni doms like to indulge in some simpler pleasures of life, such as daydreaming about mentally torturing and killing off their classmates (their adult counterparts daydream during their tedious, unfulfilling jobs, usually while operating highly dangerous equipment which requires attentiveness and strong sensory awareness, leading to many ironic mutilations and deaths.) as well as ego masturbatory fantasies about how the world would be a so much better place if only they were in charge. The average person may feel sorry for the tormented Ni dom, but rest assured, it is a necessary mechanism to keep their population in check and reduce the possibility of breeding.
[The usual escapist fantasy]
Why are Ni dominants so rare?
While they appear unassuming and harmless to the untrained eye, Ni doms are in actuality very dangerous individuals. This means it is an imperative to maintain the delicate balance in their native ecosystems. The predatory SPs and SJs have been tasked to make sure the Ni dom population is kept at low levels at all times. This is done by employing methods such as relentless bullying and crushing all of Ni dom's dreams and aspirations to tiny bits, which in turn makes them spiral into even more isolation and depression effectively preventing reproduction. The ultimate goal is preventing bigger congregations of Ni doms forming and them engaging each other. Should two Ni doms find themselves in disagreement and happen to be unable to reach an agreement there's about a 90% probability of our Universe collapsing unto itself, and then we're all f*cked.
Evolution:
[Once you're seen the mastermind's true face, it will already be too late]
Some theorize the Ni doms have developed cunning, deceptive survival mechanisms to adjust to their environment by posing as SPs, avoiding their population being thinned out by the enemy, which enables them to find mates with more ease and hopefully pass on their unique genetic information. The most notable example is the INFJ Lady Gaga, a mastermind par excellence, whose evident ploy of taking over the sheeple world by masquerading has been a truly huge success. Don't be fooled by the seemingly simplistic and frivolous lyrics, they are actually webs of extremely complicated symbolism beyond the sheeple's ability to comprehend and carry embedded messages of death and destruction.
and baby angel Hitler.
[The cuddly patron saint of megalomaniac Ni dominants everywhere]
Disclaimer: I don't actually know Lady Gaga's type, but I heard her being typed as an INFJ so I included it for comedic purposes. For what it's worth her presentation may come of as some combination of Ni-Se.