Hidan (飛段, Hidan) was an who defected from and joined the . There he was partnered with despite the two's somewhat mutual dislike of each other. He was also the second newest member of at the time of his introduction. laughingly referred to Hidan and Kakuzu as the "Zombie Combo" (ゾンビコンビ, Zonbi Konbi).
After Yugakure deteriorated from a shinobi village to a tourist site, Hidan became infuriated with how things were turning out. He believed that the that resided there were meant to kill, and thus slaughtered his neighbours before leaving Yugakure, and joining the cult-like faith known as , a religion that worshipped a deity of the same name. The primary teaching of this faith appears to be outright slaughter, where anything less than utter destruction is considered a sin. Through experiments with Jashin's secret technique, Hidan was granted with immortality. Eventually, he joined Akatsuki after seeing , a man who he saw as a pioneer in immortality, and he was later partnered with him.