Diego, commonly referred to as Dio, is a primary antagonist in JJBA part 7- Steel Ball Run. He's a genius British jockey hailed as one of the best contenders in the Steel Ball Run race, but he soon finds interest in the Saint's Corpse. Despite working with different factions during the course of the race, Diego is only loyal to himself by choice. Via a variation of the Stand "Scary Monsters" acquired from Dr. Ferdinand, Diego has the ability to transform himself and others into dinosaurs.