Hidan is a fictional character in the Naruto series, a fanatical member of the Akatsuki organization. He is known for his immortality, cruel personality, and devotion to the cult-like religion of Jashin. Hidan uses a unique ritual-based combat style that allows him to inflict damage on opponents by injuring himself after drawing their blood. He serves as one of the major antagonists during the Akatsuki arc, particularly in the conflict involving Asuma Sarutobi and Team 10.