The first JoJo and the hero of the Phantom Blood, the first arc of JoJo's Bizarre Adventure. His interactions with his adopted brother Dio Brando influences the lives of all future Joestars.
Jonathan Joestar was the only son of wealthy man named George Joestar until he decided to adopt a boy named Dio Brando, who was a son of petty thief named Dario Brando that was trying to rob from Joestars while they were unconscious from carriage accident. However thinking that he was trying to save them George Joestar tells the man that he owe his life and return favor, and thus Dio was able to be adopted. Jonathan's life was happy and easy going until Dio appeared, who plans to ruin Jonathan's life and inherit Joestar's fortune no matter what.
Jonathan Joestar was created by Hirohiko Araki, the author and illustrator of series, as main character of Jojo's Bizarre Adventure, Phantom Arc. The original manga series was originally serialized in Weekly Shonen Jump in 1987, until it was transferred to monthly Ultra Jump. Its first volume was released in August 10, 1987, published by Shueisha and still running for more than 100 volumes. It is one of the longest manga series running.
JoJo had pretty easy life, being a son of wealthy family. He was innocent and has kind heart to welcome anybody, that is until Dio came to Joestar household. Since then JoJo's life went downhill, Dio pretending to be friendly but has JoJo's friends turn their back on them. At some point the two clashes because JoJo couldn't take it anymore of Dio's bullying, and even though Dio had upper hands, JoJo defeated with his iron will. Their fight was interrupted and since then, JoJo too decides to pretend be friendly
Years later, to become strong enough to fight against Dio, JoJo trains his body and mind as far as human being can be. When Dio got his hands on Stone Mask and became a vampire, JoJo was powerless against him and barely managed to defeat him. When a man named Will A. Zeppeli appeared to assist, JoJo learns mystical fighting technique known as Ripple, which uses one's life energy to defeat undead.
Before Dio's arrival, JoJo had happy and easy life, but all that happiness was gone like dream due to Dio's influence. When JoJo's life was getting more miserable everyday, he met a girl named Erina Pendleton and fell in love with each other. Wanting to destroy any happiness JoJo can have, Dio steals Erina's first kiss which creates tension between Erina and JoJo. Knowing that Dio done something to Erina, JoJo rushes to Dio and fight against him to defend Erina's honor. Dio was winning the fight at first, but JoJo kept coming back which helped him to win the fight. At the very last moment Dio pulled his hidden knife and planned to use to kill JoJo but that was interrupted when George intervened. Since then both of them became friendly to each other but only on outside.
Years later George Joestar has gotten sick by mysterious illness. After finding letter from Dario to George by accident, JoJo starts to suspect that Dio has been poisoning his father. To find the truth JoJo ventures to dark alley of London, there he meets Robert E. O. Speedwagon who was initially attacking JoJo for money but impressed by JoJo's kind heart he decides to help him. Upon his return, JoJo confronts Dio about the poison. Dio denies at first but it was futile when Speedwagon saw through his lies. Before he was about to be arrested by police, Dio attempts to stab JoJo and use his blood to activate Stone Mask and turn himself into a vampire, but George jumps in and gets himself killed instead of his son. Being a vampire Dio becomes incredibly powerful killing most of people at ease. JoJo fight against and manages to defeat him with great injury on himself.
Dio somehow survives and regain his strength. Meanwhile JoJo is approached by Will A. Zeppeli, who informs that Dio is still alive and teaches technique known as Ripple that can defeat undead beings. Chasing after Dio is to end his reign, JoJo finally defeats Dio once again. Thinking that the world is safe, he and Erina decide to take honeymoon trip to America. However that turns out to be grave mistake when Dio returns once again and attack JoJo by surprise. Before he was about to give up, he notices a baby crying. JoJo gives everything he got to save Erina and baby, and leave himself in sinking ship. He was passed away while holding Dio's head.