The Man in the Suit was one of the key players in the Key23 Hypersigil, both he and The Driver making their first appearance immediately following Pilot Red's first(?) reshift. His role was indefinite, though his appearances had shown him trying to help Red.
His physical appearance is unclear; he had been described only as a man wearing a monocle and suit, carrying a dart gun (loaded with symbiotic microbes), handheld computer, and an unspecified number of other devices on his person.