Throughout the entirety of the series, a disembodied narrator comments on the events of the series, providing extra information about the characters, their past and state of mind, as well as giving context for the plot, for instance describing the era or the place the characters find themselves in.
Two security guards working at Naples' airport, being specifically tasked to get rid of unlicensed taxi drivers. However, Giorno Giovanna bribes them into turning a blind eye to his own activity at the airport. Thus, they purposefully ignore it when Giorno steals Koichi Hirose's luggage, even privately looking down on Giorno for stealing a fellow Japanese, tipping Koichi about Giorno's identity.
The anime adaptation features Koichi asking them information about Giorno, presumably allowing him to get near Giorno's neighbourhood.
A man of Italian origin who got married to Giorno's mother. He's the reason the whole family moved to Italy. He was a violent, intolerant man who would hit Giorno because he "constantly tried to read people". However it was quite the opposite; the child's traumatic experience is the reason he adapted the habit in the first place. After Giorno's involvement with a gangster, his stepfather stopped beating him, likely out of fear and/or threat from the gangster.
A group of racist bullies who torment Giorno regularly. There are five and then four in the manga but three in the anime. They become overly friendly to Giorno after Man X presumably bribes or threatens them into doing so.
A small group of four gangsters chasing another gangster for an unknown reason. They stop Giorno, asking him where the man ran off to, and Giorno sends them in the opposite direction in order to protect the man.
A female prison officer working in the prison where Polpo is detained. She performs a body check on Giorno Giovanna and tells him what he is allowed and prohibited to do. After Giorno asks whether he's going directly to Polpo's cell instead of a visiting room, she suspects him when she realizes he's never met the capo before. Giorno later reveals to Polpo that during the body search he "borrowed" the guard's wallet, containing her ID and several bills. When Giorno returns from Polpo's cell, her suspicion rises after Giorno's shock of there being another body search. While Giorno hides the flame of the lighter Polpo gave him within his closed palms, the guard pats him down and says he's all clear and free to go. Just as Giorno becomes relieved, she says he also needs to open his hands because she has to check them. Giorno quickly uses Gold Experience to transform the lighter into a flower. Believing the flower is harmless, the guard is tricked into letting Giorno leave.
An old janitor who is shown working outside the middle school dorms of Naples Middle-High School, where Giorno Giovanna lives. He asks Giorno to open the door for him because his hands were full and his bucket of water was about to spill. However, Giorno ignores his request due to his focus on Polpo's lighter. When Giorno leaves his room later, the janitor accidentally splashes him with water while cleaning the stairs, extinguishing the flame on Polpo's lighter. Worried about the functionality of the lighter, he reignites it and points out that it's not broken, while also wondering what Giorno was doing with a lighter in school. This results in him being killed by Black Sabbath, which pulls the man's soul out of his body. Giorno later on, disgusted by the death of the innocent man, kills Polpo in revenge.
A truck driver used by Sale in order to trap Guido Mista. He bears a similar appearance to Sale's initial silhouette before his full reveal. The driver is unable to stop the truck he is driving because of Kraft Work's ability to lock things in position, as he can't get his hands away from the wheel and his feet off the pedal. Forced to drive around Capri by Mista, he is left angered by the strange happenings between the two, before being forced by Giorno to drive again when the latter tries to retrieve Mista.
The father of Narancia Ghirga was an honest gardener. However, he never cared much about his son. After the death of his wife, he became completely neglectful, up to the point where he didn't notice that his child quit school and spent most of his time away from home with thugs, roaming streets, and stealing dinners from restaurants. Despite Narancia being alone and having nowhere to go after reform school as he was shunned by his peers, his father is nowhere to be seen.
A group of children and thugs that Narancia Ghirga used to spend time with. Narancia considered friendship as the most important thing in the world and often stayed at his friends' houses instead of attending school. He looked up to one of the older thugs with blond hair. One day, that friend suggested that Narancia should dye his hair blond as well if he wanted to look like a badass, so Narancia followed his suggestion. In reality, that "friend" set up for Narancia to be accused of his crimes. Narancia was arrested the next day and thrown to reform school, where he learned that an elderly woman had her home broken into and was brutally assaulted by a teen with blond hair. The woman testified that Narancia was the culprit. Although Narancia suspected his friend of being the actual criminal, he chased the thought out of his mind.
Narancia got an eye infection due to being beaten up by the police officers, and after returning to his hometown, his friends spread a rumor that he caught the infection from his late mother. Narancia then realized the truth because his older friend was the only one he told about his mother's infection.
An old woman whose house was broken into by one of Narancia Ghirga's friends with blond hair. When the woman witnessed the crime, she was brutally assaulted by the culprit and left with severe injuries including a broken arm. After seeing Narancia with blond hair, she angrily testifies that he was the one who committed the assault.
A female spider that Formaggio picks up from the sewers and catches in a jar. Although it isn't a black widow spider, Formaggio mentions that it still has enough venom in her bite to paralyze the tiny Narancia. Narancia is trapped in the jar with her and they battle each other. The spider shoots webs at Narancia and manages to bite him. It presumably dies when Aerosmith burns down the surrounding area.
One of Fugo's teachers at the university, whom was beaten by a young Fugo with a 4-kilo encyclopedia. Only mentioned in the original manga, he is shown in the anime adaptation. There are two versions to what the teacher did to anger Fugo. The anime's version has the teacher sexually harrass Fugo. The Purple Haze Feedback novel mentions that the teacher mocked Fugo for caring about his dead grandmother.
A pimp that paid Leone Abbacchio back when he was still a police officer in order to get away with his activities with a prostitute. Abbacchio thought it would be pointless to arrest him since he would just pay his bail and he'd be out on the streets again, so he accepted the money. However, it turned out that he was also a robber, and because of Abbacchio's past with the criminal, he was left shocked and vulnerable. The pimp then drew a gun and attempted to kill Abbacchio, but his life was saved by his partner, who sacrificed his life, haunting Abbacchio with guilt for the rest of his years. The pimp was shot in the arm by Abbacchio's partner during the confrontation.
When Guido Mista was 17 years old, he was walking alone at night and witnessed a woman being beat up by a man inside a car. The woman was half-naked with blood coming from her nose and mouth. Two other thugs were also sitting in the car. Without thinking, Mista jumped to her rescue and beat up the thugs, being forced to kill them in self-defense. The woman he rescued was never located by the police after the incident.
A group of three thugs who assaulted and raped a woman in their car until Guido Mista confronted them. Mista rammed his knee against one thug's stomach so hard that it nearly knocked him out and caused him to vomit. The man grabbed his revolver and shot at Mista six times at close range but each bullet missed. The other two tried to shoot him as well but all of their bullets miraculously missed Mista even though they were at point-blank range. He snatched one gun from the first thug, calmly loaded it, and then shot and killed all three of them with amazing accuracy. Mista was then arrested and told that he would be sentenced to anywhere between 15 to 30 years in prison. However, he is scouted by Bruno Bucciarati and joins Passione in exchange for a verdict of innocence.
Bruno Bucciarati's mother was a very loving woman. Her son loved talking to her and enjoyed the bedtime stories she would read to him. She and her husband decided to divorce on their 10th year of marriage when Bruno was 7, and she was going to leave the small town to live in the city. She tried to sway Bruno to live with her, but he refused and chose to accompany his father, as he knew his father was the saddest about the separation. Bruno's mother was proud of her son's kindness and although she was initially sad about his decision, eventually set it aside. She hoped that his kindness to overly sympathize with others' sorrows wouldn't cause misfortune to him. Two years later, his mother got remarried to a man from Milan. By the time Bruno became 12, she and Bruno would only see each other on Christmas.
Two men who pretended to be fishermen and hired Bruno Bucciarati's father to transport them to an isolated islet off the coast of Naples. However, one of the dealers "forgot" his fishing rod on the boat, resulting in Bucciarati's father going over to deliver the rod to the man. Bucciarati's father stumbled upon the two men dealing drugs with two other thugs and was shocked. The recipient of the drugs became angry with his dealers because someone would spot them every time. Bucciarati's father was shot multiple times for being a witness, piercing his body with seven bullets. The drug dealers left him for dead but later found out that he was rescued and taken to a hospital. They sneaked into his hospital room at night to finish him off, but the young Bruno ambushed and killed them, slicing the chest of one of them and stabbing the other in the eye.
A man in Venice wearing a white suit. He bumps into Narancia when the latter is sitting at a restaurant. Narancia's wine spills on his suit and the man angrily berates him, saying his suit costs 500,000 yen. Narancia assumes he's the enemy and starts kicking him. Mista and Abbacchio also join in on kicking him. After he's all bloody, they realize he's just a normal civilian. Abbacchio then checks his mouth for any poison.
An ordinary maid working in a Venitian hotel. Knocking on Diavolo's room to clean up and seemingly hearing no one, she unlocks the door and almost discovers his true appearance. However, the room is dark and immediately tries to leave, allowing Diavolo to erase time, take his dossier and get away, leaving the confused maid alone. After that incident, she decides to ignore what happened and starts cleaning.
This little boy from Sardinia tries catching a bug sitting on the branch of a plant, but the bug hops away onto the road. The boy jumps after it just as an oncoming truck is behind him. Vinegar Doppio yells for the boy to get away and tries to pull him but the boy tells him to stop yelling and that he knew there was a truck, dodging Doppio's arms and getting off the road himself. Doppio gets hit instead while the boy goes after a butterfly. When Diavolo kills a nearby fortuneteller, the little boy witnesses the whole thing behind a pillar and drops the container he was holding. At that point, Diavolo had already transformed back into Doppio and grabbed the boy's arm. While Doppio was distracted with the bug he just noticed on the ground behind him, the boy runs away screaming and crying.
After Vinegar Doppio tries saving a kid from an oncoming truck and nearly gets hit himself, a Sardinian fortune teller sitting by an alley asks if he's having bad luck. The man urges Doppio to have his fortune read but Doppio refuses despite being given a discount. To prove himself, the fortune teller tries to divine Doppio's past, revealing that he was born in Sardinia, has a secret that can be considered living a double life, and that he's looking for someone very important to him. Doppio tries to refute his claims saying that they're just general statements, but the man pries deeper into his past and states that he's looking for his daughter who he hasn't seen in 15 years. The man suddenly becomes confused because of Doppio's young appearance and begs to read Doppio's palm for free out of his own curiosity.
Suddenly, Diavolo intervenes and grabs the man's face, frightening the fortune teller who witnesses his change in appearance. Diavolo forces him to divine the whereabouts of Risotto Nero and the man obliges. The man then grabs Diavolo's palm and says that it's beautiful, until he notices that the lifeline on the palm just disappeared. Just as he realizes he was holding his own hand which Diavolo cut off, King Crimson obliterates his upper body with a single punch.
A dishonest taxi driver who drives Doppio from a village up to Costa Smeralda. When they reach their destination, the driver tries to scam Doppio by asking for ten times more than what he actually owes. When Doppio insinuates that the price must be wrong and that he only has half that amount, the man angrily threatens him. The taxi driver then tries to take Doppio's envelope from him, believing it is full of cash when it's actually only important pictures. Doppio becomes violent and nearly gouges the man's eye out before he hears a phone ring and grabs a toy hanging from the driver's rear-view mirror. While he uses it as a phone to talk to his boss, the taxi driver thinks he's on drugs and flees with 20,000¥'s worth in euros which he steals from Doppio.
A group of tourist kids playing football near Costa Smeralda. Diavolo infiltrates their group as Doppio after abducting one of the children and stealing his clothes. The ball they were playing with gets stuck on top of a tree branch and they try to throw rocks at it to get it down. Abbacchio yells at them to be quiet and to go play on the beach, until he notices their ball is stuck. Just as he gets the ball down for them, Bucciarati and Narancia find the abducted kid behind a rock with his wrist cut and his mouth stitched closed with his shoelaces. Doppio was actually the one to kick the ball up there so he could kill Abbacchio. One of the kids tells Doppio not to mess up again, and another wonders if he actually has any friends among them.
In 1978, eleven workers were conducting a survey for mineral resources within a crater where a meteorite fell several millennia ago in Cape York, Greenland. Two of them contracted an unknown disease and developed tumors across their entire bodies which killed them within 48 hours. The two men had both fallen in the crater and received minor cuts to their hands and feet, leading the doctors to believe that a virus was dormant within the meteorite in that crater which entered their bloodstreams. Their bodies underwent unbelievable physical changes including one man's fingers creating sparks like a stun gun which burnt off the fingers of one of the doctors treating him. Polnareff later discovers that the arrow is made from the same material as the meteorite.
Four drunkards who Mista spies on while preparing to leave toward Rome. Two of them are asleep on a bench. One of them hugs a water fountain and expresses his urge to urinate in it while his friend tries pulling him away. While the drunkard continues to hug the fountain, the friend then relieves himself in a post box. The man hugging the fountain keeps yelling about how he's a man of his word and is going to do it, so his friend pulls him once more. However, his upper body gets torn off. The drunkard crawls after his friend, demanding to take a leak because he can't reach his legs. The friend tries to runs away in fear until his legs fall apart as well. Mista witnesses the two men who were asleep have also died with their bodies torn apart. They are all victims of Green Day's mold.
A little girl who sat next to Doppio during his flight to Rome. Doppio borrows the girl's toy phone so that he can contact the Boss. After Doppio politely returns the phone back to the girl, she attempts to answer it.
In the summer of 1967, a team suddenly discovers that one of their inmates have become pregnant despite having been in an all-female prison (including the staff) for 2 years. They help the mother give birth to the child, who is named Diavolo. In the anime, one of the guards witnesses the start of the child's multiple personality disorder as the baby's eyes briefly change colors. This startles the guard although she doesn't signal it.
Diavolo's foster father was a kind priest living in a small village in Sardinia who accepted to adopt the infant born in the prison. As Diavolo grew, the priest and the village thought of him as cowardly and clumsy. However, the man was openhearted, as when Diavolo told him that he wanted to become a sailor, he agreed that would be Diavolo's best path instead of becoming a priest.
When Diavolo became 19 in 1986, the priest watched his son go on a date with a girl on the Emerald Coast. He decided that his son was old enough to have a car and began to build a garage beside Diavolo's room. When he began digging into the concrete, he unearthed Diavolo's mother, who was buried alive under her son's room. That night, a fire burned the entire Sardinian village to the ground. The priest was confirmed dead as one of the casualties.
Chariot Requiem's soul manipulation affects the entirety of Rome, leading to several bystanders seeing themselves in another's body. A man switches bodies with his dog and then nervously looks at himself barking. A policeman and a nearby pigeon switch bodies. The soul of the policeman's partner switches with the criminal they captured in the back seat of their car. A mother and her baby switch bodies, leading to a dumbfounded baby looking at her own body babbling like a child. A couple has also switched bodies. In the man's body, the woman cries because she needs to urinate but cannot bring herself to touch the penis. She resorts to begging her boyfriend to handle it for her but he knows it would look indecent in public while he's in her body.
The criminal enjoys his newfound freedom and power in the policeman's body and puts handcuffs on the mother rolling on the ground. He then tries to arrest Mista in Trish's body, who unceremoniously shoots and kills him. Eventually, they begin to transform into unknown creatures from another world due to Requiem's true power, but are returned to normal after its defeat.
When Diavolo is punched into the Tiber, he climbs into a sewer and encounters a crazed homeless man delirious from drug intake. In a fit of paranoia and angry that Diavolo is trying to steal his coat, the homeless man stabs the Passione Boss in the gut, killing him for the first time.
Diavolo finds himself on a city street and becomes nervous about what Gold Experience Requiem has done to him. An old man walking his dog sees Diavolo and tries to help him, but his dog barks at the Boss, startling him. Diavolo backs away and trips on the pavement, falling into the path of a car.
A civilian who ran a flower shop in Piazza Monte Santo and had a bad leg. Fugo said he's a normal, honest man. His daughter dated Scolippi but she passed away. He, like most people, misunderstood Scolippi and his Stand ability and thought he was the one who murdered the unfortunate girl. Wanting revenge, he begged Bruno Bucciarati and his team to punish the man, up to the point where he was willing to pay the assassins all of his life's savings.
The seventeen-year-old daughter of the flower shop owner who was in a romantic relationship with Scolippi. While she told her mother about her boyfriend, her father was unaware. One day, she went to Scolippi's apartment, clutched a stone-shaped sculpture, and then jumped off the roof. Her suicide was predicted by Rolling Stones, however the difficult-to-understand ability of Scolippi's Stand made it look like he was the one who killed her. Her father stated she's not the kind of girl who would kill herself, and became determined to avenge her.
Two women visiting Napoli. They ask Giorno for directions to the Church of Santa Chiara but are victims of a pickpocket. Before the man can get away, Giorno steals the wallet back and gives them to the women, although he takes some of their money too.
One of the many illegal taxi drivers operating at Naples' airport. Caught red-handed by "Leaky-Eye" Luca conducting business without paying the gangster his fee, he is beaten by Luca himself. In hopes to lighten his beating, the man denounces Giorno Giovanna as another illegal taxi driver who has been working under Luca's nose. It doesn't do him any good, as Luca finishes him off with a last shovel bash, his ultimate fate being left unknown. In the adult swim broadcast, this character is called "Grifter".
A young child whose father was killed by Man X. He confronts him and his colleague in an alleyway with a gun, and becomes extremely emotional. Man X tells him that his father broke the rules of his turf by selling drugs to children. He tries to shoot but is unable to and breaks down in tears.
An unnamed Italian man who, two years ago, was the target of Formaggio. His talk about adressing the Naples waste management issue and meeting with the Minister of Tourism suggests that he was an important official. However, Formaggio put an end to his life when he slipped a shrunken car into his drink and then grew it back, making his torso explode and crushing the rest of his body.
Fugo's parents, a wealthy couple living in the luxurious suburbs of Naples. They pressured a young Fugo into academic excellence, exacerbating his violent tendencies. Moreover, they disowned him when he beat up a professor with a book, throwing into question how much they ever loved their son.
The Shady Engineer (闇技術者,Yami Gijutsusha) is a Passione member that Risotto Nero coerces into running some computer analysis for him at the same time Melone battles Giorno. He is an adult man who's most remarkable features are a ponytail and a P-shaped tattoo over the right eye. His involvement in the story suggests that he's a computer expert. Warning Risotto about the risks of rebelling against the gang, he gets his left hand and left eye crippled for his trouble.