Koby Morgan is a supporting character in the anime and manga series One Piece. Starting as a timid and cowardly cabin boy under the pirate Alvida, Koby dreams of becoming a Marine. After meeting Monkey D. Luffy, he gains the courage to pursue his goal and eventually joins the Marines. Over the course of the series, Koby grows significantly, both in strength and conviction, becoming a symbol of justice and determination within the Marine ranks.