Naoya Zenin (禪ぜん院いん直なお哉や Zen'in Naoya?) is an antagonist in the Jujutsu Kaisen series. He was the youngest son of Naobito Zenin and believed himself to be the true heir of the Zenin Family. Naoya was also the head of the clan's elite unit of jujutsu sorcerers, the Hei.