Doppio is The Boss' younger, more innocent and eccentric underboss. As a member of Passione, he thinks of himself as the most loyal subordinate to Diavolo, but in reality, the two are separate souls inhabiting the same body.
Doppio appears as a fairly slim yet fit young man, described as appearing too young to have children. He has freckles, contributing to his boyish looks, and light-colored irises that disappear when he is not in control of the body. His hair is tied into a neck-length ponytail by a weave-like braid; the front hair is left loose and sweeps over to one side lock, the position and length of which is portrayed inconsistently.
His clothing consists of a light-colored sweater with gash-like openings on it that leave the midriff exposed and a loose pair of jeans with studs covering the thighs and sides of the ankles. Doppio also wears a black mesh shirt underneath the sweater.
Doppio is a much more regular person in contrast to Diavolo: friendly, honest, and a bit cowardly. Doppio regularly hallucinates random objects as "phones" with which he talks with his alter-ego, not knowing that they share the same body.
Doppio mostly behaves like a good-natured teenager and is by default a friendly and polite individual. Doppio frequently seems good with children as he once successfully borrowed a toy phone from a child while taking a plane and even risked his life to save another one. Whenever attacked, Doppio automatically reverts to a state of true fear and submission, often choosing the safest option such as comply with his aggressor's demands. He believes himself to be unlucky, which provides an ironic contrast to Diavolo's good fortune.
Fiercely loyal to his boss to a point of attempting to fulfill the mission first and foremost, Doppio is somewhat resourceful although Diavolo has to help and counsel him from time to time. Despite this, though, bits of Diavolo are in Doppio: during the battle with Risotto Nero, Doppio refused to leave the battle or have his boss step in, remaining and doing all he could to find a weakness in Risotto's Stand, Metallica. He shares his alter ego's collected nature when in battle, and while his first actions are usually panicking and screaming, he soon and very quickly calms down, carefully using his tools to identify the enemy and their powers.
As Diavolo is very gentle and patient with Doppio, he is usually completely unquestioning, agreeing to whatever his "boss" says. As he dies, Doppio's last thoughts are of his boss, remaining faithful until the end and smiling, saying that if Diavolo is going with them he'll surely win and asks Diavolo to call him, remarking that he feels lonely.
However, as a result of his bipolarity, Doppio is also subjected to angry mood swings, and swears heavily during these fits, though unlike Diavolo he is less controlled and focused with it. Snappy, Doppio flat-out disobeyed and argued with his direct superior during the battle with Risotto, berated Bucciarati for nearly falling into the street, and even rebuked Diavolo himself once more for "calling" him in Bucciarati's presence. He also has a low tolerance and almost zero patience for "idiots" and people who withhold "phones" from him.
Doppio has been shown questioning fortune telling, as he stated that some of the guesses the fortune teller made were simply that due to his appearance ("You're a tourist," because of his bag, "You have a secret," because everybody does, etc.).
Even with the bridge of personality to personality, however, he is entirely unaware of their co-inhabitance and considers himself Diavolo's underboss and, furthermore, an entirely separate person. Being an entirely dissociative personality; Diavolo was shown moving Doppio out of the alley shortly after killing the fortune teller so he didn't see the corpse, but also possibly to withholding his actions from Doppio entirely. Doppio seems to be largely unaware of what the objects he calls "phones" really are that Diavolo converses with, being an ice cream cone, a burned cigarette or even a frog. He seems to have a poor memory to top it off, but whether it's due to Diavolo's influence over Doppio is unknown; Before encountering Risotto, Diavolo warned his alter ego that the assassin was in the area and gave him strict instructions on how to deal with him and how to complete the mission. However, upon "hanging up", it didn't take more than a brief moment for Doppio to immediately forget his mission, what he was just ordered, the fact that Risotto was in the area, and above all, how he managed to talk to the boss despite his phone being broken.
- Diavolo: While Doppio never learned the truth between themselves, he highly respects Diavolo and always called him "Boss" - though whether or not Doppio knew Diavolo's name is unknown. Doppio also seems to be Diavolo's gopher, something he takes pride in considering how loyal he was to a point of stubbornness, and he seemed heed most of Diavolo's orders when he remembered them.
- Risotto Nero: Both of these characters have a mutual dislike for each other. Risotto dislikes Doppio simply because he is connected to "the boss" and vice versa because Risotto is looking for the boss. As Risotto continues to try to kill Doppio this dislike grows to the point that Doppio is willing to risk his own life for a chance to kill Risotto.
- Main article: King Crimson
Doppio is capable of using Epitaph, a sub-ability of King Crimson, as well as King Crimson's arms; Doppio assumes he is borrowing them from Diavolo. They allow him to see ten seconds into the future and perform powerful strikes. He is also able to communicate with Diavolo by hallucinating phones out of random objects.
Doppio is first seen in Sardinia, carrying a briefcase. In his introduction, he appears to be saving a little boy from being hit by a truck as the boy is seen playing with a bug. After possibly subconsciously using King Crimson to avoid being hit by the car, Doppio caught the attention of a fortune teller. While at first skeptical, Doppio became interested in the man's fortune telling when he began telling him that he had a daughter, even though he looked far too young. The fortune teller himself was left astonished that Doppio was a father, and pried to see his palms, leaving him uneasy. Doppio begins to panic as the fortune teller began to harass him not of a desire for money, but to figure out the mystery behind the strange boy. In a twist, Doppio grabs the fortune teller and slams him into a wall, calling him a "dead man". It is then that he transforms into Diavolo and kills the fortune teller. The boy from before witnesses this, and Doppio emerges from the shadows, pushes him out of the way, and tells the bug that was next to him to be careful as he runs away screaming and crying in fright.
After getting into a taxi and being conned by the driver, Doppio arrives at Donatella's house seemingly with no sign of pursuers, but is called by Diavolo and told that they are being watched. Doppio turns around and sees Risotto Nero, having arrived to attack Team Bucciarati when they inevitably arrive at the house as well. Instructed by his Boss to get Risotto within two meters to allow King Crimson to kill the traitor, Doppio waits for Risotto to appear behind him and turns around to attack. However, Risotto quickly outmaneuvers him and Doppio smacks his face against a rock. Left bleeding profusely enough to get blood all over his shoes, Doppio begins to panic. When Risotto questions what's in an envelope (containing the photo of Donatella) underneath Doppio that the young man appeared to have deliberately hidden, he is led to believe it is only a bit of rubbish as Doppio manages to stick the photograph to the bottom of his foot with his own blood.
Though Doppio has convinced Risotto that his fear and cowardice were genuine, Risotto notices that Doppio reacted to the sound of Aerosmith patrolling the area, and figures out that he's a Stand User. Doppio once again attacks Risotto, but it is then that razor blades suddenly appear in his mouth. Attempting once more to attack Risotto by running at him unintentionally reveals to the assassin that whatever Stand Doppio has must be a close-ranged Power-type, and keeps himself from getting within 2–3 meters. Needles then begin spewing out of Doppio's mouth, leaving him even more confused to Risotto's Stand as the assassin suddenly disappears.
In response to Doppio's inexperience in battle, Diavolo grants him Epitaph as well as King Crimson's arms. The first thing Doppio forecasts using Epitaph is Risotto turning invisible and a pair of scissors inexplicably forming in his neck, ready to cut his throat. He wonders how the scissors could move on their own, and before they could snip his throat, he forcefully tears them out. Risotto once again disappears, and Doppio sees a foot getting severed. He tells Diavolo what happens, and is ordered to run away. However, he figures out Risotto's Stand, Metallica's ability, and throws the scissors in a direction. The scissors sever Risotto's foot while a nearby frog explodes into razors. This proves to Doppio that Metallica's ability is that of magnetism of the iron in blood. Just then, multiple knives created from the iron in the sand are sent at Doppio, and while he deflects most of them, few are able to strike him. Diavolo reprimands him and tells him that he is "on his way" to finish Risotto off himself. Risotto reattaches his foot with Metallica and turns invisible once more.
Doppio peers into Epitaph's forecast and sees a large chunk with blood gushing missing from his own head, causing him to panic. While his body begins to change as Diavolo slowly emerges, Doppio uses the knives to pinpoint Risotto's location like a compass. However, upon throwing them, Risotto reveals that he expected it, and detached his severed foot for the knife to locate. Razors start forming in Doppio's head, and Risotto declares victory, having figured out that Doppio is actually the Boss himself. The instant he orders the razors to explode out of Doppio's head, Risotto is shot by a volley of bullets. Diavolo takes over and reveals that the knives thrown were in the direction of Bucciarati's group, causing Aerosmith to attack whomever was in the direction of the thrower.
As Doppio has lost a lot of blood and is heavy on breath, Risotto, the larger blip on Narancia's radar, was targeted. More bullets rip through Risotto, sending his still-invisible skin flying and landing on Diavolo's body, revealing the cause of the missing chunk in Doppio's head. Diavolo is left standing over Risotto in victory and offers him a quick and honorable death in exchange for him restoring his iron levels to normal. However, as a last resort, Risotto uses Metallica, caught on Aerosmith when his skin was sent flying, to guide Aerosmith and shoot Diavolo. Diavolo erases half a second to avoid the bullets, and Risotto ends up getting shot himself, bringing an end to the assassin.
Doppio is used to disguise Diavolo, in combination with the stolen clothes of the child they kidnapped, to allow him to get close to Leone Abbacchio and kill him before his Moody Blues could reveal Diavolo's face.
Upon arriving in Rome, Doppio is taken hostage by Secco, whom is fighting Bucciarati. As neither of them recognise him, Bucciarati saves him by placing a zipper on him to punch through him and kill Secco without hurting him. As Bucciarati had lost his sight and hearing Doppio easily fooled him into believing he was Trish, allowing him to be lead straight to Polnareff who was obviously wary of him.
When Chariot Requiem swapped the souls of the inhabitants of Rome, Doppio's soul was transferred into Bucciarati's body, with Bucciarati's soul going into Diavolo's body. Team Bucciarati keeps a close eye on Bucciarati's body. The moment Doppio began to awake, he was shot down by Mista. Though Mista claimed that the shots would not be fatal, Doppio eventually dies by bleeding out on the pavement. Before his death, he claims that he was waiting for a call from Diavolo, whom left Bucciarati's already dying body, knowing it was dangerous to stay, sacrificing Doppio to keep himself alive. Despite this, Doppio viewed his Boss' decision as a smart one that would allow him to defeat the traitors.
Chapters / Episodes
JoJo's Pitter-Patter Pop! (Android/iOS)
In the light novel JORGE JOESTAR, an iteration of Vinegar Doppio lives in the 37th universe. Although his appearance and mannerisms are similar to the original universe's Doppio, he is a lot more aggressive and does not have Diavolo as an alternate personality. Doppio is still a gang member of Passione and works for an alternate universe Giorno Giovanna.
He also wields an unnamed Stand that can convert any ordinary object into a mobile phone which anybody could use over long distances. Doppio uses his Stand to convert several objects into mobile phones for Passione, such as a pebble, rubber ball, and shoe.
Rohan Kishibe describes Doppio as being empty-eyed and Guido Mista says that he can be weird. He hums "Tomememe" (トゥエムエムエムエ) instead of "Tōrururu" (とおるるる) when calling someone or expecting a phone call. He has anger issues and thinks everyone is insulting him by calling him a phone loving freak, despite no one even mentioning phones.
Giorno finds George Joestar unconscious in Morioh and brings him to Arrow Cross House, where he heals him and orders Doppio to watch over him. After some time, Doppio grabs a book lying on the side table named Pink Dark Boy: Part 8. Volume 112. He transforms it into a phone using his Stand and calls Giorno to inform him that George has woken up. Doppio also reports that George is feeling a lot of pain and struggling to get up, before telling George that he'll get over it if he keeps moving. When George says he can't move any further, Doppio suddenly becomes infuriated and threatens George by showing the gun in his trousers. George suddenly feels better knowing the situation he's in and instantly disarms Doppio, demanding to know what is going on.
Doppio then turns a piece of George's skull into a phone using his Stand and causes it to vibrate and ring intensely, numbing George's brain and throwing off his equilibrium. George confidently points the gun to his own head and precisely shoots off a two centimeter portion of his skull that had been converted into a phone. Afterwards, George fires the gun several times at Doppio from less than a meter away but none of the bullets hit. Mista's Stand The Iron Ladies had kicked the bullets away, saving Doppio.
Doppio orders Mista to shoot George but Mista tells him to knock it off. Mista shoots six bullets at Doppio instead, and his Stand deflects the bullets just enough to scrape Doppio's cheeks, leaving three scars on each cheek resembling cat whiskers. Mista and The Iron Ladies laugh at Doppio, mocking his new appearance and saying it looks cute on him.
When Giorno finally enters the room, Doppio trembles and falls to his knees, apologizing for his manners. After learning about the other Jorge and that he is currently in England, George asks Doppio to call England, but Doppio's phone strangely can no longer connect to the pebble phone that Narancia is carrying. Doppio turns a light bulb by the bed into a phone and is capable of reaching Passione's offices in Rome, San Diego, and Tijuana, so he thinks the problem must be on Narancia's end.
Some time later, Rohan uses Heaven's Door on Diavolo and learns that he only has odd numbered pages, so someone else must have the even numbered pages. Around that time, Doppio receives a phone call and goes to another room below the study of Cube House. Assuming Doppio was trying to run away despite Cube House having no exit, Muryotaisu Nijimura summons Grand Blue to retrieve him. Rohan was suspicious of Doppio from the beginning because of the crazy things he had been saying. However, Heaven's Door reveals that Doppio has both odd and even numbered pages, so he is a normal person who is just a bit peculiar.
- The Italian version of Vento Aureo changed Doppio's first name to "Aceto" instead of "Vinegar", "aceto" being the Italian word for "vinegar".
- Doppio’s voice actor in the English dub, Griffin Burns, often posts humorous video clips in-character as Doppio doing often relatable things, and being interrupted when The Boss “calls” him. He is sometimes depicted actually speaking with The Boss, who is voiced by Kellen Goff.