Diego Brando, often referred to as 'Dio,' is a major antagonist in 'JoJo no Kimyou na Bouken,' specifically in the 'Steel Ball Run' arc. He is a skilled jockey from England with a fierce competitive streak and a deep desire for power. Known for his cunning and ruthlessness, Diego enters the Steel Ball Run race to claim its grand prize and elevate his status. Throughout the series, Diego showcases his Stand, Scary Monsters, which allows him to transform into a dinosaur and control others in a similar state. His rivalry with the protagonist, Johnny Joestar, is central to the plot.