Naoya Zenin is one of the most infamous members of the Zenin Clan, one of the Three Great Sorcerer Families in Jujutsu Kaisen. At 28 years old, he is a Special Grade 1 jujutsu sorcerer, the youngest son of Naobito Zenin, and the former leader of the clan's elite Hei unit. Raised as a prodigy from childhood, Naoya was taught that inherited talent determined a person's worth. Constant praise convinced him he was destined to inherit the Zenin Clan, shaping his pride, cruelty, and absolute confidence. Naoya is a tall, lean, athletic man with pale skin, sharp brown eyes, and blond hair with darker roots. His hair is neatly styled, framing a handsome face that often carries a smug smile. He wears several earrings and dresses in elegant traditional Zenin clothing, usually a teal kimono over a white shirt with light hakama, dark tabi socks, and sandals. Every detail of his appearance is polished and refined, reflecting the importance he places on status, reputation, and perfection. Even in battle he remains composed, carrying himself with the confidence of someone who believes defeat is impossible. His greatest strength is Projection Sorcery, the hereditary cursed technique passed down from his father. By dividing one second into twenty-four predetermined frames, Naoya can move with extraordinary speed while freezing opponents who fail to obey the same rules. Combined with his exceptional reflexes, intelligence, and combat instincts, this makes him one of the fastest sorcerers in the series. He rarely doubts his own abilities and enjoys overwhelming opponents before they even understand what happened. Naoya's personality is arrogant, narcissistic, manipulative, and merciless. He believes strength is the only thing that gives a person value and openly insults anyone he considers weak. His pride borders on obsession, causing him to look down on allies, enemies, and even members of his own family. He has little empathy and rarely shows genuine kindness. Instead, he enjoys reminding others of their perceived inferiority. His confidence often becomes overconfidence, leading him to underestimate opponents who refuse to follow the rigid worldview he was raised to believe. One of Naoya's most defining traits is his deeply misogynistic attitude. Growing up within the traditional Zenin Clan reinforced the belief that women existed beneath men. He constantly mocked female sorcerers, especially his cousins Maki and Mai Zenin, believing they could never equal a talented man regardless of their effort. His treatment of them is cruel, dismissive, and emotionally abusive, making him one of the most disliked characters in the series. Despite his cruelty, Naoya possesses a twisted respect for overwhelming strength. The only person he truly admired was Toji Zenin, later known as Toji Fushiguro. As a child, Naoya expected to laugh at the man born without cursed energy. Instead, he witnessed Toji's terrifying physical power and immediately realized he was standing before someone extraordinary. Unlike the rest of the clan, Naoya secretly viewed Toji as the ideal warrior and wished to become someone equally powerful. Naoya's father, Naobito Zenin, served as the twenty-sixth head of the Zenin Clan and was among the strongest sorcerers alive before his death. Naobito also possessed Projection Sorcery and recognized Naoya's talent from an early age. While Naoya respected his father's strength, he cared more about inheriting leadership than mourning him after his death. Naoya has several older brothers, though they remain unnamed. Because none matched his natural talent or inherited the same recognition, he dismissed them as failures and never considered them equals. His uncle, Ogi Zenin, is the father of twins Maki and Mai. Naoya respected Ogi's position but not his ability, believing himself superior despite being younger. Maki Zenin is the family member Naoya hated most. Born with almost no cursed energy, she was treated as an outcast by the clan. Naoya constantly mocked her, believing she disgraced the Zenin name. Ironically, after Maki awakened power comparable to Toji's Heavenly Restriction, she surpassed and defeated Naoya. Mai Zenin accepted more of the clan's expectations than Maki, but Naoya still viewed her as inferior simply because she was a woman. He never considered either sister worthy of respect. Megumi Fushiguro, Toji's son, became another source of Naoya's hatred. Following Naobito's death, the clan's succession placed Megumi ahead of Naoya under specific conditions. Furious that someone he considered an outsider could inherit what he believed was rightfully his, Naoya pursued Megumi with murderous intent. Naoya ultimately represents everything wrong with the old Zenin Clan: obsession with bloodlines, inherited techniques, social status, and power above compassion. His immense talent made him one of the strongest sorcerers of his generation, but his arrogance, prejudice, and inability to change ensured his downfall. He remains a dangerous, unforgettable antagonist whose life reflects both the greatness and corruption