Diavolo

Diavolo is a fictional character from the Japanese manga JoJo's Bizarre Adventure.

Story
Diavolo, the main villain of part 5, was born in a female prison. His birth is a mystery because his mother claimed that he was conceived two years before her sentence and all the guards were female. Diavolo was raised by a priest in his mother's hometown of Sardinia because she can't raise him while in prison. When he turned 19, when the priest was constructing an apartment for Diavolo, he found his mother buried alive under a stone tablet. Around the same time, a fire broke out and the priest and Diavolo were among the seven who died in the fire. However, in reality Diavolo survived and joined Passione soon after. During that time, Diavolo recovered the bow and six Arrows in Egypt and quickly ran off with them. He then sold five of the Arrows to Enya Geil and kept the remaining one for himself (that same arrow was attached to Polpo's Black Sabbath). Between Stardust Crusaders and Golden Wind, he sets out to kill all his blood relatives, and those who discover his identity, to ensure his name is erased from existence and he took the pseudonym Soliddo Nazo during his years in Passione.

Diavolo means "devil" in Italian, fitting considering his personality and role as the main antagonist of Part 5.

Stand
See King Crimson

Vinegar Doppio
Vinegar Doppio is Diavolo's young, innocent, and bizarre second personality. He considers himself as Diavolo's most trusted subordinate. Doppio acts as a disguise for Diavolo, when he interacts socially with others in the outside world. He turns into Diavolo whenever someone finds out about Diavolo's identity. Doppio communicates with Diavolo with an object that only Doppio hears ringing, making people think that he's insane, or scary (to what children think of him). Doppio usually makes the sound るるるる~ (Rurururu~), which is similar to a phone ringing.

Doppio means "Double" in Italian, showing his nature as Diavolo's second personality.