Age: 12 (1880), 20 (1888)
Birthdate: April 4, 1868
Height: 195 cm (6'5'')
Weight: 105 kg (231 lb)
Blood Type: A
Stand: Joestar Stand
Jonathan Joestar is the protagonist of Part 1: Phantom Blood, and the first JoJo of the JoJo's Bizarre Adventure series. The son of George Joestar I, Jonathan is an honest, kind, and positive man whose life is fraught with tragedy after meeting his adopted older brother, Dio Brando.
As a gentleman, Jonathan is kind and cheerful. Jonathan has a mindset where he tries to imagine the consequences his actions would have on other people, even if they appear to be enemies. He is gentle and sympathetic, feeling pain even as he defeats a zombified copper.
Despite his skill in fighting, he will never seriously harm a person without a valid reason. Yet Jonathan can feel righteous fury at the evilness of his foes and will conduct justice by defeating them. Furthermore, he does not pity truly despicable individuals he is not familiar with, such as Doobie. With his courage and spirit, Jonathan sets a legacy as the first JoJo of the series.
As an infant, Jonathan was involved in a carriage accident, resulting in the death of his mother, Mary Joestar. That same accident indirectly brought Dio Brando into his life because his father, George Joestar I, assumed Dio's thieving father saved his life and vowed to repay that debt.
After meeting Dio, Jonathan's life spirals into hell as Dio attempts to break Jonathan's spirit through dominance and isolation. At that time, Jonathan crosses paths with Erina; the two become close and eventfully fall in love. Unfortunately, Dio learns of this and decides to deny Jonathan any chance of romance by taking Erina's first kiss forcibly. After learning of Dio's deed, Jonathan confronts him at the Joestar Mansion. Jonathan briefly notices a Stone Mask on their wall reacting to Dio's blood but is distracted by his father, who attempts to stop the fight before it escalates further.
Shortly afterward, Jonathan learned that his beloved dog, Danny, had died after being "accidentally" placed in the incinerator. Jonathan suspected Danny's death to be Dio's doing, but Dio had noted the kind of person Jonathan was and decided to feign peace between them for the time being.
Seven years after Jonathan and Dio became brothers by law, Jonathan attends Hugh Hudson Academy, where he intends to graduate as an archaeologist. During those seven years, Jonathan was still wary of Dio despite his facade.
When George fell ill, Jonathan found a letter from Dio's father, Dario, and realized that Dio was poisoning his father to steal the Joestar family fortune. To find out proof, Jonathan left the mansion to find an antidote. Jonathan's search takes him to Ogre Street, where he manages to win over the friendship of a local thug named Robert E. O. Speedwagon. With Speedwagon's help, Jonathan finds Dio's poison supplier, Wang Chan, and obtains the antidote for his father.
Having learned the power of the Stone Mask, Dio attempts to kill Jonathan and use his blood to transcend humanity and become an immortal Vampire. After engaging in a fiery battle with Dio, Speedwagon manages to take Jonathan to a hospital.
After being discharged from the hospital a few days later, Jonathan meets Will Anthonio Zeppeli. After completely healing Jonathan's body, Zeppeli reveals that Dio survived the estate burning and offers to teach Jonathan to utilize respiratory-based solar energy called Ripple to defeat Dio and destroy the Stone Mask.
Dio reveals himself at that time, having learned of the Ripple fighting style of Jonathan's. Dio then shows his strongest zombie warriors, the knights Bruford and Tarkus. After defeating Bruford, he regains his human soul and, in respect of Jonathan, leaves him his sword.
During his battle against Tarkus, he ends up in a Chain Neck Deathmatch. Jonathan is nearly killed by Tarkus but is briefly saved by Zeppeli, who ends up sacrificing himself. Only after the dying Zeppeli infuses Jonathan with his remaining Ripple that the youth revives with the strength necessary to defeat Tarkus.
Soon after meeting the Ripple masters Tonpetty, Straizo, and Dire, Jonathan saves Poco's sister from Doobie before confronting Dio. After Dio's freezing powers kill dire, Jonathan gets the idea to counter Dio's freezing by channeling his Ripple through Bruford's sword.
Dio summons his zombies to take care of the others while he deals with Jonathan one-on-one. In the final phase of the battle, Jonathan sets his fists on fire to remove Dio's advantage and lands a Ripple-infused punch into Dio's stomach while sending him plummeting off the edge of the balcony. Believing Dio dead along with most of his minions, Jonathan's group destroys the Stone Mask.
Two weeks after the Windknight's Lot incident, Jonathan marries Erina, and the two board a ship heading to America for a honeymoon. During the trip, Jonathan encounters a bodiless Dio at the ship's hull. Dio reveals to take Joestar's body as his own. Dio then attempts a breakaway to kill him instantly, but the attack only fatally wounds Jonathan with his stopped breathing preventing him from using his Ripple.
Using the last of his Ripple, Jonathan manipulates Wang Chan's body to obstruct a piece of the cruise ship's mechanism. Jonathan intended this to cause an explosion that would sink the boat and hopefully end Dio for good.
While Erina was content to die with him in his final moments, Jonathan beseeches her to escape with an infant whose mother died protecting her from the zombies that Wang Chan sired. Dio makes a last-ditch attempt to take Jonathan's body at that time, only to be stabbed and restrained by Jonathan, who felt at peace in his final moments. Dio attempts to convince Jonathan to let him go with promises of immortality, only to learn that he had already died before the two were consumed in the inferno caused by the ship's explosion.
With his death, the Joestar Family survived through Erina and their unborn son.
Legacy (future parts):
Despite Jonathan's last act, Dio manages to take the headless body of his rival for his own and resurfaces from the ocean depths a century later.
During the events of Stardust Crusaders, DIO decides to completely integrate Jonathan's body to perfect his Stand by using Joseph's blood as a catalyst but ends up being defeated by Jonathan's great-great-grandson, Jotaro Kujo.
After DIO's death by Jotaro's hand, he and Joseph expose what remained of Jonathan's body to the sun as an apparent end to their feud with DIO, allowing Jonathan to rest in peace.
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