The son of George Joestar I, Jonathan is an honest, kind, and gentle man whose life is fraught with tragedy after meeting his adopted older brother, Dio Brando. Jonathan becomes a Ripple user under the tutelage of Will Anthonio Zeppeli.

As an adult, Jonathan is a tall (6'5"), extremely muscular individual with a gentlemen's poise. First and foremost, Jonathan strives to become his definition of a "true gentleman" as he carries his Joestar name with pride, never betraying his code of honor.