Joestar Group

"The youth of this town have a golden spirit. The same golden spirit shining with justice we saw on our journey to Egypt. That spirit they embody will naturally course into others without a word..."

- Joseph Joestar,

The Joestar Group (ジョースター一行) is a nickname given to the team of protagonists prominent in each part of JoJo's Bizarre Adventure. The group is composed of different members in each part, but generally consists of a JoJo and various other allies all following the same or a similar plan of action (i.e defeating DIO or protecting Morioh).

Phantom Blood
The original Joestar Group starts in the year 1888 with Jonathan Joestar, aided by his mentor Will A. Zeppeli and friend Robert E. O. Speedwagon, assisting Jonathan in an effort to deter the incoming threat to mankind, Jonathan's own adopted brother, Dio Brando.

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Battle Tendency
50 years later, in 1939, Jonathan's grandson Joseph Joestar is inadvertently embroiled in a conflict between the Ripple Clan, the secretive Nazi forces and the Pillar Men - ancient creators of the Stone Mask, who have awakened from their long slumber. Joseph, his partner Caesar A. Zeppeli, their mentor Lisa Lisa, and a tenuous ally in Rudol von Stroheim are forced to engage the Pillar Men to stop them from reaching ultimate power.

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Stardust Crusaders
49 years later, in 1988, Jotaro Kujo, the grandson of Joseph Joestar, learns that DIO has returned from the bottom of the ocean. Jotaro, having now acquired a Stand called Star Platinum due to DIO's own awakening, journeys to Egypt to defeat DIO and release his mother Holy from his curse. He is accompanied by his grandfather Joseph, Muhammad Avdol, Noriaki Kakyoin, Jean Pierre Polnareff and a dog named Iggy.

DIO once dismissively called this group the Joestar Egyptian Tour Group (ジョースター・エジプト・ツアー御一行様).

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Diamond is Unbreakable
11 years later, in the year 1999, the illegitimate son of Joseph Joestar, Josuke Higashikata with his Stand, Crazy Diamond, takes it upon himself to protect his hometown of Morioh from enemy Stand users after his grandfather is killed. He is mainly aided by Jotaro, his classmates, and a strange mangaka. They target Stand users who use their Stands to harm others such as Anjuro Katagiri, Akira Otoishi, and ultimately Yoshikage Kira.

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Vento Aureo
2 years later, in 2001, Giorno Giovanna, the son of DIO, joins Bruno Bucciarati's team of Passione gang members in order to rise within the ranks and overthrow their mysterious boss, who is flooding the streets of Naples with drugs. By doing so, Giorno hopes to set the mafia's moral standards straight again. The group is also incidentally aided by previous Joestar Group members Polnareff and Koichi.

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Stone Ocean
Ten years later, in 2011, Jotaro's estranged daughter, Jolyne Cujoh, is incarcerated for a crime she didn't commit inside a prison where a conspiracy is being orchestrated by DIO's old confidante, Enrico Pucci. Initially meant as mere bait to lure in her father so that his soul can be stolen, Jolyne decides to stay inside, reclaim her father's soul and put a stop to Pucci's plans, aided by fellow inmates and the prison's various odd denizens.

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Steel Ball Run
In an alternate universe, in the year 1890, Gyro Zeppeli rides coast to coast to compete in the Steel Ball Run race. He is joined by Johnny Joestar, who follows Gyro in hopes of learning his Spin techniques which might restore Johnny's ability to walk. While racing, they discover the Saint Corpse Parts, sought after for their many blessings. The price is out on the duo's heads as they fight off other racers, mercenaries, & even the US president.

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JoJolion
120 years later in 2011, Josuke Higashikata is joined by his love interest Yasuho Hirose, his adoptive family, their business partner, and various people from his past, as they work together to discover Josuke's original identity, which might hold a clue to overcoming the Higashikata Family's generational curse. Their investigations lead them to uncover Morioh's deepest secrets and run afoul of the mysterious Rock Humans.

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Non-Canon Members
In JoJo's Bizarre Adventure: Eyes of Heaven, Jotaro Kujo and Joseph Joestar join forces with the remaining main JoJos of all 8 parts of the series, as they work together to collect all the Saint's Corpse parts and defeat Heaven Ascension DIO.

The main JoJos are assisted by a large group of allies, lead by Robert E. O. Speedwagon. Some of the allies had originally died and been possessed by DIO, but were freed from DIO's control and revived via the Saint's Corpse.

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Trivia

 * Though not initially planned, Araki threw around the idea of Hol Horse joining the protagonists of Stardust Crusaders during their journey, but opted out due to balance issues with Polnareff's similar characteristics. Araki mentions this as part of the reason Hol Horse shows up multiple times throughout the story and why there is at least one group shot with Hol Horse present.