Functional Order: Ni-Fe-Ti-Se
The minute Poirot receives several letters of a sinister nature, he suspects “something” is going on, there’s a pattern behind them, they are different from the usual fan or hate mail he receives; even when the inspector scoffs at the idea, Poirot fixates on finding a connection between them. His intuition takes time, since it’s focused and specific, and he puts things together that the inspector cannot understand (why would you reach that conclusion?) but that are often accurate (he winds up predicting a murder just seconds too late to prevent it). By the end of the case, Poirot had figured out the motives of everyone involved both from his instincts about people and observing the crime scenes (Se) – things other people failed to notice or consider relevant information (like, how the woman upstairs has been grinding her heels into someone’s back). Poirot is inactive except on a case, and shows very little ability to react in the moment, instead choosing to notice things. Though this Poirot is extremely introverted, distant, emotionally shut down, and even cold, he still operates on a basis of needing the crime to make internal sense to him before he can close the case or move on; in several instances, ignoring the “evidence” in favor of his instincts (Ni) and his desire for consistency in his conclusions (Ti). Flashbacks reveal him as a man able to understand other people’s fears and comfort them. He also works out conclusions in his head and only shares the results with others.
Enneagram: 1w9 sp/so
Not once in the entire series do we see Poirot ruffled. He never expresses or shows anger, even when others insult him to his face and leave him waiting for hours to speak to a police inspector. He’s hard-working and diligent, approaching each case with a desire to bring dignity to the dead and avenge their deaths. He honors the promises he makes to the dead, and uses that as a reason to persist even when the police tell him to back off. He is calm, exacting, and also caught up in his own little mental world (9 wing). He trusts himself to reach logical conclusions and approaches everything from an intellectual angle, leaving most of the actual hands-on policing to Scotland Yard.