Johnny Joestar is the protagonist of 'JoJo's Bizarre Adventure: Steel Ball Run', the seventh part of the JoJo series. He is a former horse racing prodigy who lost the use of his legs and falls into despair. However, he enters the Steel Ball Run race to find a purpose in life and regain his mobility. Johnny is a courageous and determined character, marked by his growth from a self-pitying individual to a resolute hero. His Stand, Tusk, evolves throughout the series, reflecting his personal development and determination.