Functional Order: Te-Ni-Se-Fi

Extroverted Thinking: Byakuya always speaks his mind, to the point of rudeness, and is very assertive of his presence thanks to his Te-dom. He takes pragmatic standpoints–he works on his own to avoid being blindsided by betrayal, stresses that you can’t count on other people to act by your standards, and eats alone in case someone poisons his food. In the class trials, he always keeps a clear head, expertly puts clues together, and delivers his arguments in a cold, rational fashion. When he agrees to work with the group after Chapter 4, he immediately takes a leadership position, organizing the others harshly but efficiently to do what must be done.

Introverted Intuition: Byakuya doesn’t waste his time with things or people that are unimportant to him, focused solely on his goal of ‘winning’ the killing game. He instinctively knows how to narrow in on suspicious individuals and ignore false leads, looking right past Yasuhiro to pin Celestia as the culprit in the third trial. He is so confident in his abilities and intuition, in fact, that he will drink a bottle labelled poison to prove it isn’t. This singular focus, though, can make him blind to possibilities he’s already dismissed, which is why he falls into Aoi’s trap in the fourth trial–he could not comprehend her feelings (Ni narrow-mindedness + inferior Fi).

Extroverted Sensing: His logical personality prevents him from hoarding or being overly excessive, which is a pitfall for Se users, but Byakuya still enjoys fine things in life. He’s particular about the qualities of drinks, food and clothes, with his favored gifts being things of expensive or exquisite make. He flaunts his high status and the power of the Togami Conglomerate, but isn’t satisfied to just rest on his laurels–Byakuya grabs opportunities to get to the top, but carefully, using his Te and Ni to decide which moment is the best.

Introverted Feeling: He struggles to understand emotions, especially others’; he’s completely blown away by Aoi only claiming to have murdered Sakura, not actually doing it, because her feelings are something he’s never experienced. Fi users have a hard time empathizing if they haven’t been in the others’ shoes, especially when it’s inferior. Byakuya also isn’t comfortable showing his own emotions, either–even later in the series, where he’s developed his Fi, he still uses logic and actions as a front for his care.

Enneagram: 538 (5w6, 3w4, 8) - The Solution Master (Suffers no fools, narcissistic, and refuses to acknowledge own emotions. Focused on his image as the Ultimate Progeny, has a confident aura. Enjoys tackling problems and gathering knowledge. 5 fix makes him less social, but clever. 3w4 makes him a snob to ‘plebeians’, quite pretentious. Does not like relying on others.)

I know what y’all are thinking. ‘Byakuya, an extrovert?!’ Admittedly, I was thinking that too. He’s one of the most anti-social guys in the game; introvert was the obvious guess. I knew those functions were right, but the stacks with Introvert leading just didn’t quite fit.

So I went back to dig through his dialogue and see if I could find anything that supported extroversion. And I actually did: when he tells Makoto to help him investigate in Chapter 2, he mentions that he doesn’t enjoy talking to people he wants nothing with. His distance from the group isn’t because he doesn’t like socializing, it’s because nobody around him is someone he wants to talk to. Even extroverts have to have people they don’t like hanging out with, like introverts have people they do, right? So yeah, extrovert it was.