He notably taunted Kars when he launched him into space, claiming to have again planned everything from the beginning just to antagonize him one last time. Furthermore, Joseph is a foul-mouthed individual and regularly taunts his enemies, enjoying aggravating them. Having no respect for authority save of his grandmother's, and later Lisa Lisa's, Joseph has antagonized policemen and mafiosi alike. Quick to violently respond to the slightest provocation, Joseph would often get into brawls growing up prior to the events of the story, he had been imprisoned seven times and expelled once from school for fighting. In Battle Tendency, Joseph is a young, hotheaded, impetuous, and confrontational young man. Later depictions of Joseph include the aviator hat and goggles, both of which were permanently added to differentiate him from Jonathan and compliment the overall 'mechanical feel' brought about by the various planes and motorcycles present in Part 2. Joseph's resemblance to Jonathan was a result of the times, as having the main character die was unprecedented in a Weekly Shonen Jump story so Araki thought it'd be fitting to make the next protagonist resemble the last one to ease readers into the story. After Kars cuts off his left hand, Joseph has it replaced with a mechanical prosthetic, courtesy of Stroheim, which can already convincingly mimic human movements. Other articles include an aviator's hat (as motorcycle gear), a knit cap, and a breathing mask designed for Ripple training. During the fight against Straizo, Joseph uses an M1928 Thompson submachine gun with a 50-round drum magazine.

Initially, he wears a white collared shirt with a tie and suspenders, and a greatcoat chequered across the shoulders. In Switzerland, he dons a long, broad, striped scarf and later, as a posthumous gift from Caesar, a long, thin headband patterned with a row of tessellated triangles. He wears a tank top cut above the navel, gloves studded at the knuckles, fitting pants with a leather belt, and knee-high leather boots. Joseph's primary outfit is relatively minimal and pragmatic. Suzi Q finds his mouth weird looking, and an Esidisi-possessed-Suzi Q bizarrely calls him handsome. He has short, dark, and unkempt hair, parts of his bangs shooting outwards in spikes, apart from which he closely resembles his grandfather Jonathan Joestar. Joseph is 18 years old, tall (195 cm/6'5'), and powerfully built, with light eyes.

Joseph joestar listening to music gif