In Greek mythology, Prometheus is a Titan known for his wily intelligence, who stole fire from Zeus and gave it to mortals for their use. His myth has been treated by a number of ancient sources, in which Prometheus is credited with (or blamed for) playing a pivotal role in the early history of humankind.
So the NT-temperament is the "Promethean" temperament because NTs want to make people more like Gods trough their inventions.
But which NT is the quintessitial Promethean?
Traditionally, the experts have been torn between INTJ and ENTP and I see why: Given that Extroverted Thinking is the rule-abiding function, ENTJ is easily ruled out. And given that Introverted Thinking is mostly interested in validating truths for themselves (as opposed to for mankind) or alternatively, invent a better version of fire altogether, we are left with INTJ and ENTP.
INTJ, because it is important for them to make a stand that quantifies their uniqueness in the world (for reference, read Ayn Rand, INTJ) and ENTP because they are natural iconoclasts/provocateurs and they tend to make definitive stands when pressured (for reference, read the Apology of Socrates, ENTP).
Prometheus is Introverted because his thoughts go to the future. Because he thinks before he acts. Prometheus is committed to his inner vision and acts on it (INTJ).
Prometheus is ENTP because he risks his life rebelling for what is ultimately a good cause. Stealing the fire may not have been wholly thought through but a result of the prompting of Extroverted Intuition.
Which NT do you think is the quintessitial Promethean?