Good grief (Yare yare daze)... Height: 195cm Age: 17 Weight: 89kg Wears a black gakuran cap. A golden chain hangs straight down his custom gakuran. He has a cool-headed personality and will do whatever it takes to realize his own sense of justice, but he is the type to think carefully while making quick judgments. He always acts on what he believes is right. According to him, he has done 'troublemaker' things like refusing to pay for bad food at a restaurant or beating an opponent more than necessary in a fit of rage. However, he cannot tolerate seeing @@nauseating evil@@ and will force the outcome he desires. As for more of his notorious deeds, he once gambled the souls of his friend and mother to achieve his goals (during his fight with D'Arby). Furthermore, when his mother first visited him in jail, he committed the outrageous act of shouting, "Shut up, you annoying woman!" Occasionally, he can seem surprisingly petty. When a villain named Steely Dan had the chance to treat him like a servant, Jotaro wrote down every single grievance in a notebook and, once the tables turned, recited them all while paying him back with his fists. In the Dark Blue Moon arc, when the captain (who was a villain) told him not to smoke on the boat, he got so annoyed that he used a trick to confirm the man was a villain, which turned out to be correct. He also shows a surprisingly tsundere side. He personally saved a girl named Anne and continued to look after her. His sense of camaraderie is incredible; notably, after his journey ended, he was seen cherishing a photo of his companions with a rare, gentle, and peaceful smile. This covers his history before coming to the other world.

After coming to the other world: He has become the Demon Lord.

Oraaaaa!!!!! Star Platinum is Kujo Jotaro's Stand, possessing a muscular humanoid appearance in shades of purple and blue. It is characterized by overwhelming destructive power, ultra-high-speed movement, and superb precision, boasting reaction speeds fast enough to catch a bullet with its fingers. Its observational skills are so sharp it can sketch a fly that passed by in a second. Its speed allows it to throw about seven punches per second. Very rarely, it can use a super finishing move called 'Star Finger,' where it extends two fingers to attack. It later awakens as 'Star Platinum: The World,' gaining the ability to stop time for a brief moment. Its stats are: Destructive Power A, Speed A, Range C, Persistence A, Precision A, and Developmental Potential A. It is said that few Stands in JoJo history can match Star Platinum's power and speed. When throwing punches or attacking, it repeatedly shouts: "Ora! Ora! Ora! Ora!" This is considered the most important part—the battle cry that defines Star Platinum's identity.