Jotaro Kujoh

Jotaro is introduced as a rough delinquent, but he has a gentle heart and is loyal to those he likes. He is highly perceptive, intelligent, and quick-witted while keeping a perpetually cool, slightly neutral, or disinterested attitude.

Jotaro's most noticeable trait is his seemingly aloof nature. He is a quiet individual, often satisfied with expressing himself in short phrases. His bio explains that he thinks anyone can tell his emotions just by looking at him, and probably thinks further effort in portraying how he feels to be a waste of time, making others tend to perceive Jotaro as callous. Related to this, Jotaro is an extremely cool individual, able to keep his composure in even the direst situations. The best example of his coolness would be against Daniel J. D'Arby, playing a dangerous game of poker during which he successfully bluffs the expert poker player into folding even if he didn't know what cards he had and wagered the souls of every companion and ally involved. While he was shown to be mildly anxious when something unanticipated happens, Jotaro almost never goes as far as to lose his cool.

In Diamond is Unbreakable, Jotaro noticeably becomes more kind and mature, taking Josuke Higashikata under his wing and expressing interest in Koichi Hirose's abilities, though he still has moments reminiscent of his younger self, such as yelling at Josuke's groupies during their fight. He has given up smoking and drinking, too. While his role in this part is nowhere near as prominent as it was previously, he still isn't afraid to get involved in deadly battles.