Main antagonist of JoJo no Kimyou na Bouken Parts 1 and 3, also playing an indirect, yet major, part in Part 6. Becomes a vampire during the events of Part 1 via the Stone Mask. Gains a Stand power named The World in Part 3.
Had many illegitimate children during his time as a vampire lord, most notably Giorno Giovanna, the main protagonist of Part 5. Three of his other sons also appear in Part 6 as antagonists, Donatello Versus, Rikiel, and Ungaro.
His namesakes are Ronnie James Dio and Marlon Brando.