Jotaro is a tall, attractive, and well-built man, even as a teenager. He has dark hair that constantly blends with his hat, a strong jaw, bold eyebrows, and green eyes. He bears a mild resemblance to his great-great-grandfather, Jonathan Joestar, and his grandfather, Joseph Joestar when he was young.
Jotaro's wears a modifies trenchcoat-length gakuran/tsume-eri with a tall, stiff collar, pierced on the left with a golden chain. Underneath, he wears a fitted, sleeveless shirt and a pair of slim-fitting pants of very short, sharp flares held up by two thin belts, often differently colored, patterned in a row of alternately colored tessellated triangles (reflecting Caesar/Joseph's headband).
Jotaro's iconic cap is adorned near the center with a golden button and, on its left, a rectangular golden plate with a design of a flattened hand. It is torn at the back, appearing to merge with his hair.
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.
Jotaro is an extremely cool individual, able to keep his composure in even the direst situations.
Jotaro is both fierce and gentle. These traits can be seen in how he spares Noriaki Kakyoin instead of killing him outright, even putting his own life on the line just to save the young man from DIO's deadly slavery. Despite refusing to show it explicitly, Jotaro loves his mother and respects his grandfather Joseph.
Jotaro's impetus for going to Egypt is Holy's life being put in danger by DIO's Stand, and he flew into an uncharacteristic rage when the vampire desecrated the corpse of his grandfather, before apologizing to Joseph's spirit (who had previously warned Jotaro not to succumb to anger).
During his journey to Egypt, Jotaro attached himself to his companions, and through several small gestures expressed his friendship towards them. Signs of him loosening up were also shown where he occasionally (but not often) smiles.
Jotaro also has a soft spot for children and is noticeably more tolerant and protective toward them.
Jotaro hates people who hurt women or children in a fight, even if the woman or child in question is evil, and will be especially violent toward them. However, Jotaro doesn't show mercy to evil women and will if need be severely beat them. Furthermore, nagging girls chasing him (both at his school and throughout his journey) annoy Jotaro, who ignores or rudely drives them away, particularly when they begin to fuss or bicker.
Moreover, Jotaro is blunt and foul-mouthed, having no problem being insolent towards his mother or any other authority figure. The teenager favors witty one-liners, often ridiculing whoever is the target of his quips and offering absurd reasons for his feats. Whether Jotaro does take himself seriously or is just having fun when using his one-liners is left unanswered. Nonetheless, Jotaro has shown a modicum of respect to the occasional enemy Stand User.
Jotaro is interested in a large range of subjects, such as sumo or the TV series Columbo, from which he claims to have acquired his deductive skills. Several hobbies indicate that he has an intellectual side, which would result in him becoming a marine biologist. Ironically, Jotaro is one of the few who can appreciate Calcutta's atmosphere, which shocks Joseph.
Jotaro also has a quirky, particular fashion taste and attachment to his clothes, from refusing to cut off parts of his pants when the school nurse asked him to, to buying clothes to replace the ones that were destroyed after a fight with exact replicas. He also has an attachment to his hat.
Jotaro has a habit of muttering "What a pain..." to himself to express annoyance towards the ordeals and other events that happen close to him, to the point it has become one of his catchphrases.
One of the strongest Stands in the series, Star Platinum possesses superhuman senses, strength, stamina, accuracy and speed. Like other physically-powerful (or Close-Range) Stands, Star Platinum suffers from a narrow range of activity; active only within a 2-3 meter from Jotaro.
The Tarot card The Star, after which it is named, symbolizes hope, above all.
Jotaro is extremely proficient at using his Stand, which is facilitated by how powerful it is in the first place. The student is capable of exploiting the basic abilities of a Stand to channel Star Platinum inside his body for better protection or only conjure a part of it for stealth. He is also imaginative in using its physical prowess, using it to punch through obstacles at its most basic, but also stretch it for extra range, lift heavy objects, or more ridiculous ideas like using Star Platinum's lungs to neutralize Justice.
Since he lacks the stamina, Jotaro only stops time with parsimony. He mainly uses it for defense, using the extra time to defend an ally or avoid attacks, and has only occasionally used timestop for offense.
Jotaro is an adept tactician, using a mix of straightforward brute force and unexpected tricks to prevail. Thanks to Star Platinum's tremendous strength in all regards, Jotaro can either force his way out of any tough situation or use unexpected feats of strength such as tunneling his way toward an enemy or using his lung capacity to neutralize a fog Stand. Jotaro has occasionally used the environment to his advantage.
Jotaro is a good trickster although not on the level of Joseph. He is an accomplished bluffer, and uses the enemy's own vigilance against the formidable Star Platinum to psych them out.
It is implied that Jotaro has accumulated a considerable amount of varied knowledge.
While not nearing the levels of superhuman strength possessed by his Stand, Jotaro himself is still notably strong, and has been for along time; even when de-aged he was able to deliver a painful punch against a full-grown man.
Jotaro is naturally confident and intolerant to suggestions that he should defer in any way, backed up by his own strength as well as that of his Stand.
Jotaro has an impressive ability to bluff, as seen by his refusal to look at his cards when playing poker with D'Arby the Elder, and having confidence to rely on Joseph to pick up on his signal by announcing his pitch against D'Arby the Younger.
The Joestar family's "Secret Technique", running away is usually utilized as a last resort.
