Hidan (飛段, Hidan) is an S-rank missing-nin who defected from Yugakure and later joined the Akatsuki. There, he was partnered with Kakuzu, despite the two's somewhat mutual dislike of each other. He was also the second newest member of Akatsuki at the time of Tobi's introduction.[2] Kisame Hoshigaki 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 shinobi that resided there were meant to kill, and thus slaughtered his neighbours before leaving Yugakure, and joining the cult-like faith known as Jashin, a religion that worshiped a deity of the same name.[1] The primary teaching of this faith appears to be outright slaughter, where anything less than utter destruction is considered a sin.[4] Through experiments with Jashin's secret technique, Hidan was granted immortality. Eventually, he had become affiliated with the criminal organisation, Akatsuki and after learning that one of its members, Kakuzu was a pioneer in immortality as well[5], he joined and was partnered with Kakuzu. Sometime later in the anime, Hidan and Kakuzu met with Sasori and Deidara to discuss their new missions assigned by Akatsuki. After Kakuzu said they had a choice between a money-making mission and a war-mission, he chose the money mission after Sasori and Deidara showed no interest in it, much to Hidan's annoyance.
Hidan was a very foul-mouthed and disrespectful individual; he frequently used profanities and complained at allies and opponents alike, despite being a "highly religious" person. He rarely used honourifics when speaking, and, even then, usually as a form of sarcasm, for example when he called Deidara "Deidara-chan".[7] He was the only member of Akatsuki who did not respect their leader, Pain, and openly declared his willingness to kill him around others. The only respect he ever seemed to give was to his god, and, even then, he was quite willing to use his name as an insult. He openly held his partner, Kakuzu, in contempt for his habit of blasphemy, love of money, and Kakuzu's frequent ridicule of Hidan's religion and battle style. Despite this, whenever Hidan was in the mood to kill, the two worked together flawlessly in battle, and one can infer that he did care somewhat for his partner, from his panicked reaction when he almost killed Kakuzu while being possessed by Shikamaru's technique.
Hidan had absolutely no moral restraints regarding the people he killed; he considered slaughter a religious calling, and often took considerable pleasure in making his opponents' deaths as painful as possible. He is sadistic and enjoys torturing his opponents. The amulet around his neck was a symbol of Jashin, and he used it to pray to his god before battling, requesting a good kill, or (when he was not allowed to) for forgiveness.[8] Given the requirements of his voodoo-like curse ritual, he was quite willing to inflict pain and injuries on himself, and showing a masochist side as he openly relished the shared pain between him and the cursed victim. Despite this, he reacted "normally" (that is, he didn't enjoy the pain) to being injured by someone else, or when the opponent didn't share the pain.
Hidan's behaviour in the anime bordered on insanity; he was frequently heard shrieking loudly while attacking, and laughed maniacally when he was about to kill Asuma Sarutobi. Hidan also appeared to be quite spiteful towards his enemies (and nearly everyone else), even commenting to Shikamaru Nara that "I've been waiting for this" ("this" referring to using his ceremony to kill Shikamaru).
However, his immortality had made him arrogant, and he frequently engaged opponents with no regard for strategy, save to acquire some of their blood. Although ridiculed for his foolishness by Kakuzu and Shikamaru alike, being obviously inferior in tactical genius to either of them, and even admitting that he was not very intelligent himself, he was able to analyse the nature and limits of Shikamaru's Shadow Imitation Technique, and conducted battle accordingly (though he retained his arrogant attitude even under these circumstances). Interestingly, he seemed to panic when Shikamaru took control of his body, shouting at Kakuzu to do something in a rather frantic voice. He didn't particularly like it when Kakuzu assisted in his battles, and only called for his help when he decided he needed it. Kakuzu tended to return the favour by coming in "late" and letting Hidan be wounded (though still alive) as punishment for underestimating his opponents. After his head was reattached, he showed a great hatred towards Asuma. In the anime, after being recreated, Hidan stated that being controlled by Kabuto Yakushi was the worst.