Inspector Koichi Zenigata features briefly in *The Hemingway Papers* solely as comic relief. His role is minor, disconnected from the central plot concerning the Hemingway treasure or the rival factions on the Mediterranean island.

His characterization focuses entirely on a recurring gag: he persistently expresses hunger and preoccupation with food, often insisting on eating before resuming his pursuit of Lupin III. This aligns with established traits where Zenigata consumes large quantities of food, especially under stress.

No character development, backstory, or meaningful interactions specific to this special occur. His presence provides only brief humor, without advancing the narrative or his broader character arc.