“If something is important enough you should try, even if the probable outcome is failure.”
Ni – Elon Musk is a man of vision. It’s not uncommon for his public appearances to feature him talking about “making life interplanetary” and his future plans. Ever since he was a child, he has always been very future-oriented and driven, and he’s never too afraid to try new things in his career in order to achieve what he wants. He often takes risks to innovate and create (somehow also related to his inferior Se). He risked graduating university early with a bachelor’s degree in physics in order to receive another bachelor’s degree in economics in order to have a deeper understanding of economics and business, which helped him become the businessman/scientist he is today. Most of his actions as a young man and his actions today have been driven by his strong Ni – his strong vision to succeed and change the world. He also has a unique perspective on how the world works, and a knack for talking about the endless possibilities of the human race and its future.
Te – Musk often tells it like it is. During interviews, despite of his slightly shy behaviour, Musk is known for being blunt. With Te as his auxiliary function, he also spends a lot of time planning (although with his dominant Ni, he uses his planning skills mainly for work and planning out the future of Tesla and SpaceX rather than just for daily necessities, unlike like Si-doms and Si-auxes). Ever since he was a young man, he has been carefully planning his future, and this is where his combination of Ni and Te comes into play.
Fi – Musk uses this function well. He has once said that as a child, he used to be bullied, and this was what influenced him to “save the world”. He has a mission to get the human race to Mars in order to save everyone from “extinction”.
Se – For an INTJ, Musk displays quite a lot of this function. Let’s not forget the recent SpaceX explosion. It is clear that Musk is an avid risk-taker when it comes to work. But funnily, his Se didn’t stop there. During interviews, he would often make spontaneous jokes (Business Insider has a whole article on this). Moreover, his occasionally funny, spontaneous tweets (he sometimes doesn’t think twice before tweeting. An example of this is his recent tweet on Westworld that’s got everyone either laughing or offended. He even once said that impulsive tweets are “the best ones”) convey this deep-seated Se.