ISTJs are characterized by a strong sense of duty and a nature of assuming leadership when necessary. A quality that almost every Marvel fan remembers T’Challa for.
ISTJs are also known for their high level of responsibility, something that distinguishes T’Challa from other “dominant”/”leading” Avengers such as Tony Stark. They are decisive and careful, although they’re not really good at reading the outcome of situations (low Ne).
Although the comic version of T’Challa screams “ENTJ” right into our ears, Chadwick Boseman’s portrayal of T’Challa uses a lot more Si function-wise than Ni. This might also be due to his character having only debuted in the movie (not enough screen time to show us what his auxiliary function is) – we only know for sure that he is a Te user.
Here’s a functional analysis of T’Challa’s personality:
Si – He is dutiful and willing to follow the tradition of his family as the heir to his father (the previous king of Wakanda and Black Panther). This tradition is more than just a tradition to him – it’s his life.
Te – T’Challa is a natural leader. He may have inherited this from his father, but it’s something he’s good at. He assumes leadership right after his father passes away. He is also very decisive and blunt (needing to learn diplomacy as it doesn’t come naturally to him – definitely not a Fe user here).
Fi – T’Challa is private about his feelings. He prefers to act on them, especially under stress. After the death of his father, T’Challa impulsively chases down Bucky out of rage. Of course, his logical nature wins out in the end.
Ne – T’Challa doesn’t display much of this function. He’s not the best at reading people and situations, and not the best at experiencing and going through changes.