Eustace Winner is a rookie prosecutor. He was assigned to take over a number of Miles Edgeworth's cases by the Prosecutorial Investigation Committee, which was headed by his father Blaise. Although he graduated at the top of his class, he was incompetent to the point of being ridiculed by the likes of Kay Faraday, Dick Gumshoe, and Larry Butz. While starting out as incompetent, Eustace would eventually learn the truth about himself and reform his ways.