Eustace Winner is a young rookie prosecutor who was assigned to take over a number of
Miles Edgeworth's cases by the Committee for Prosecutorial Excellence. Despite graduating at the top of his class and receiving many awards during his legal studies, leading him to becoming a prosecutor by the age of 17, he was barely competent and had terrible logic; it would often fall to judge and Committee member
Verity Gavèlle, who acted as his assistant, to argue Edgeworth's logic.
(spoiler hidden)[From https://aceattorney.fandom.com/wiki/Eustace_Winner]