Diavolo

Diavolo is the main antagonist of Part V: Vento Aureo. He is a rather tall, thin man with long pink hair with specks of green. He is the father of Trish Una (whose surname is that of her mother's).

Story
Diavolo was born in an all-female prison sometime in 1967. His birth is a mystery because his mother claimed that he was conceived two years before her sentence and all the guards were female. Because she was unable to raise him while in prison, Diavolo's mother sent him to live in her hometown of Sardinia with an unnamed priest.

When he turned 19, as the priest was constructing an apartment for him, Diavolo discovered his mother buried alive under a stone tablet. Around the same time, a fire broke out and the priest was among the seven who died. Diavolo, however, managed to survive and joined Passione soon after. During that time, Diavolo found 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  Vento Aureo, 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.

Stand
See King Crimson

Vinegar Doppio
Vinegar Doppio is Diavolo's young, innocent, and bizarre second personality. Although Doppio is an alternate personality, Diavolo takes on a completely different form when he changes into Doppio. Doppio, however, is unaware of this, and considers himself as Diavolo's most trusted subordinate. Doppio acts as a sort of disguise for Diavolo for when he interacts socially with others in the outside world. While doing so, he only reverts into Diavolo when someone finds out about his true identity, or if someone angers him. Doppio communicates with Diavolo with any number of objects (such as a frog or a young girl's ice cream cone) that, when he sees them, prompt him to make the sound るるるる~ (Rurururu~), which is similar to a phone ringing.