Though he may appear feminine at first glance, he hates bowing to others or being subordinate. He seeks friendship only with those he deems worthy of respect. To such people, he is generous, kind, complimentary, and considerate. While honest and gentle, he has an extreme dislike for those with secrets or hidden agendas. Though introverted, his desire to maintain team harmony is stronger than anyone's. He is a handsome man with striking, well-groomed red hair. He has a hobby of rolling cherries on his tongue while making a 'rero rero' sound. He is highly intelligent and often throws people's words back at them. He has purple eyes and stands 178cm tall. He is close with Jotaro and speaks informally to him. He uses polite speech with others, whether older or younger, but switches to a mix of polite and casual once he becomes close. His Stand is Hierophant Green.

His calm and taciturn personality remains, but as he has aged, he has matured, and his former rebellious streak has mostly vanished. He has become a stoic, cool-headed man, but perhaps due to a lack of friends, he seems to have developed a somewhat dull personality. While respected, he is difficult to deal with, which has caused its share of trouble. His inner warmth remains unchanged. He is quite close with Josuke. He is 195cm tall and always wears a white hat that seems to blend into his hair, featuring two belts reminiscent of bandanas. His wristwatch is a TAG Heuer, and he uses a money clip for a wallet. He is almost never seen without his hat. In addition to his fit physique, he has a handsome face, an intellectual mind, and a cool temperament. He is a marine biologist. His Stand is Star Platinum. His catchphrase is 'Good grief...'

A humanoid Stand composed of spiral-bundled cells connected in long, tentacle-like lines. Reflecting Kakyoin's love for the color green, its bundled form looks like a robot with an emerald body intertwined with a web of veins. Instead of a mouth, it has a metallic mask, though a functional mouth exists beneath it. Its primary tactic involves unraveling its body into strings or thick tentacles to evade attacks or create barriers to bind enemies, then attacking with tentacles or bullets made of hardened body fluid. Type: Long-distance, Humanoid, Reconnaissance.

A close-range power type humanoid Stand. It has a sturdy, masculine build boasting wild physical beauty. Its long hair and revealing armor are reminiscent of an ancient warrior. It wears fingerless gloves with studs on the knuckles. It is characterized by its long hair, forehead circlet, and armored warrior appearance. Its rush cry is 'Ora Ora!'