His catchphrase is "Good grief" (Yare yare daze). His Stand is Star Platinum, considered "invincible." He has a 195cm tall, sturdy physique that defies high school standards, and a star-shaped birthmark on his left shoulder. He wears a school cap, a long gakuran jacket with a metal chain, two belts, and round earrings in both ears. A single lock of hair hanging down is his trademark. His eye color is slightly green. His hat is a particularly symbolic item, appearing to merge with his hair. He is highly intelligent, always quiet, and composed. He possesses excellent memory and observation skills, once performing the feat of memorizing all the patterns on over fifty-three playing cards identified by Star Platinum. On the other hand, he has a passionate side; he feels intense anger toward villains who exploit women and children and is the type to hold a grudge, never forgetting humiliations from despicable opponents. His delinquency is deep-seated, and he is labeled a punk—a fact he is well aware of. However, he also has a kind heart that cares for his friends and family. As seen in his dialogue, he loathes those who oppress or exploit the weak above all else, and his sense of justice is extremely strong.