Johnny (Jonathan) Joestar had a aristocratic upbringing in 1872 Kentucky With his father being a successful horse raiser, land and farm owner,and a 7-time champion of the infamous triple crown horse races. Upon Johnny first riding a horse at the age of 5 his father considered him a horse riding genius, due to his understanding of the horse. Many years passed and His brother Nicolas, Also a horse riding genius died in a accident involving a white mouse distracting the horse, losing control and coincidentally being killed. Johnny believes that the white mouse involved in the accident was the one that he kept as a pet and refused to kill after his father ordered him to do so, the thought of him indirectly killing his brother had a major affect on him and never has left him to this day.
Several years later as a successful jockey, he has risen to fame, he is the #2 Jockey behind Diego Brando. As a Popular jockey he is crowded with paparazzi and gets very cocky, he is told to cut in line by His was then girlfriend to get into a play, he is shot in the spine by the man who he cut, due to him waiting throughout the night just to have his place taken by someone else. He was sent to the hospital where he was abused, abandoned by his friends due to him no longer being a jockey. He had lost all hope until the Steel ball Run race, Where he met Gyro (Caesar) Zeppeli, he noticed a spinning steel ball in one of his holsters, As he touched it , for a moment, he stood. After that he sought out Gyro to learn how to stand,and maybe even walk, and coincidentally, joined the Steel Ball Run Race.