Mr. Green: Extraverted Intuition (Ne)
(According to the “real” ending, Mr. Green is not who he pretends to be, but let’s go with the character he’s acting as for the majority of the story.)
Mr. Green is nervous and chatty and prone to random conceptual leaps—“Mrs. Peacock was a man?!” He’s had to live his whole life under a pretense, acting out a part that everyone wants to see. He’s the one chosen to distract the cop, making up idle conversation while the others hide the bodies. He connects the dots during dinner conversation that all of them work in the government, and wonders what it could mean. In the real ending, he’s first to arrive at the conclusion that Wadsworth is really Mr. Boddy. He slaps Mrs. Peacock because it seems like a good idea at the time, and he’s kind of awkward in his own body, often falling prey to clumsiness.
Best Suggestion: ENFP
Wadsworth: Introverted Intuition (Ni)
Wadsworth has one goal for the evening—to dispense with his accomplices and tighten the noose on his blackmail victims. For this he invents a whole evening of shadowplay, a complex plan to push his dinner guests toward murder. He assigns each of them colorful names, possibly related to how he visualizes their individual personalities in his imagination. Or maybe as if he’s picturing them as pawns on a gameboard. Though he’s confident of his plot, he can become just as panicked as anyone else when the environment changes too quickly—when the lights go out, he mistakes a shower faucet for a doorknob. He walks, or rather runs, the company through the night’s events, appearing to have solved the crime when actually he already predicted what everyone would do. For all his foresight, he fails to react in the moment when Mr. Green gets the drop on him and ends his crime spree.
Best Suggestion: INFJ
(Not really sure that Wadsworth is actually an Ni-user, but I think this paints a decent portrait of the cognitive function as if he were.)