The "man in suit" in Persona 3 primarily refers to Shuji Ikutsuki, the chairman of the Specialized Extracurricular Execution Squad (SEES) and the Gekkoukan High School board.
Initial Presentation and Role
Ikutsuki is initially presented as a benevolent, albeit somewhat eccentric, figure. He acts as the advisor and benefactor for SEES, providing them with resources, information about the Dark Hour, Tartarus, and the Shadows. He often makes light-hearted, sometimes pun-laden, comments, which can initially endear him to the player and the SEES members.

- He explains the mechanics of the Dark Hour and the existence of Personas.
- He directs SEES missions against the twelve Full Moon Shadows.
- He appears supportive and knowledgeable, guiding the young Persona users.
The Betrayal and True Nature
A significant plot twist reveals Ikutsuki's true intentions. He is not an ally but a manipulative antagonist seeking to bring about "The Fall," an apocalyptic event. His affable persona is a carefully constructed facade to deceive SEES into eliminating the twelve Full Moon Shadows, which were, in fact, sealing Nyx, the harbinger of The Fall.
Key aspects of his betrayal include:
- Manipulating SEES into destroying the seals (the Full Moon Shadows).
- Attempting to sacrifice Aigis and the SEES members on the Moonlight Bridge.
- Revealing his nihilistic desire for the end of the world.
Significance
Ikutsuki serves as a critical antagonist whose betrayal deeply impacts the SEES members, particularly Mitsuru Kirijo, whose family he served. His actions directly lead to the progression of the main plot towards its climax and highlight themes of deception, trust, and the burden of responsibility. He embodies a sophisticated, intellectual form of villainy hidden beneath a disarming exterior.