Jean Pierre Polnareff (ジャン・ピエール・ポルナレフ, Jan Piēru Porunarefu) was confirmed for the game alongside Hol Horse.
As a Stand user, Polnareff is one of many characters with wildly varied abilities that grant him uniqueness in battle.
At the end of the events of Stardust Crusaders, just before boarding his plane back to France, Polnareff is ambushed by a revived, yet brainwashed Avdol and Iggy. Injured but alive, Polnareff managed to escape and warn Jotaro and Joseph, who encountered a time-displaced Robert E. O. Speedwagon. After guiding the former allies to the rooftops where Kakyoin was killed, Jotaro and Joseph defeat the both of them. Polnareff can tell that Avdol and Iggy really were revived, but something was wrong with them.
Polnareff along with the other two Joestars then encountered a revived N'Doul and Kakyoin, who was suffering from the same effect as Avdol and Iggy. Polnareff joins with Jotaro to defeat both, with N'Doul defeated and Kakyoin unconscious. With the help of Robert E. O. Speedwagon, the remaining members of the third Joestar Group use one of the Saint's Corpse parts to not only break Kakyoin from his mind control, but also use another one nearby to travel throughout the timeline and recover their fallen allies.
In the Vento Aureo arc, Polnareff, along with Kakyoin and Joseph, were split up from Jotaro and Speedwagon, and they were transported to a train station in Rome, Italy. Polnareff tells his allies to catch up with Jotaro first and meet each other on the station Polnareff is staying. While waiting for his allies, Polnareff found a turtle called Mr.President walking around the station. As Polnareff regrouped with Jotaro and Speedwagon, he introduced him to Giorno Giovanna. Giorno himself felt like he had met Polnareff before, but was interrupted by a revived Vanilla Ice and one of Giorno's fallen revived allies, Bruno Bucciarati.
After defeating the two, but not before they escaped, Polnareff confirmed to Jotaro that Ice was the most dangerous servant of DIO, as he was the one responsible for the deaths of Avdol and Iggy. However, Polnareff felt something suspicious on Vanilla Ice, as he was still a vampire like DIO, but somehow can survive the sunlight for some strange reason. The remaining members of Bucciarati's gang: Giorno, Guido Mista, Trish Una and recently revived Narancia Ghirga recognized that the Polnareff they knew had his soul transferred into Mr.President's body because of Giorno's recognition. They also soon realize that this was his past self, which in turned confused Polnareff at their claim, who had not yet lived through these events at that moment. The remaining members choose not to reveal Polnareff's fate, by pretending that they did not meet yet and rubbed it off as a joke. Once the next Corpse part had been found, the heroes (sans Jotaro) entered Mister President's body as Jotaro himself carries them to transport to another point of the timeline.
Transported during the events of the Diamond is Unbreakable arc, he, Jotaro and Kakyoin are called by Joseph for a meeting about the true culprit behind the timeline interference, and soon find out that the culprit was still DIO. However, they remain unaware that the DIO they saw was different and from a parallel world.
After encountering other Joestar Groups in different points in timeline, even another timeline, as well as encountering the DIO that was responsible for these strange interactions, as well as an encounter with Funny Valentine, Polnareff had soon encountered and brought back Avdol and Iggy back to their normal states. Polnareff was glad to have them back, but his relationship with Iggy was still awkward.
In the final battle against the alternate DIO, Polnareff the rest of the allies were split from Jotaro and Jolyne by the Alternate DIO as part of his ambush to leave Jotaro powerless and had their souls being stolen through targeting Mister President itself. After Jotaro defeats the alternate DIO, the timeline restored, but a new timeline is created, where all of their allies manage to survive until their final battle, with Polnareff taking care of an unconscious Avdol, Kakyoin and Iggy instead of leaving to France, waiting for Jotaro and Joseph's return as they wish to greet them once they were back at full health.
Unlike the previous game, Polnareff's main color scheme is now based on his anime appearance.
He was paired with Rohan Kishibe in the Eyes of Heaven Tournament, but was eliminated in the preliminaries by Giorno and Mista.