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 his introduction. Kisame laughingly referred to Hidan and Kakuzu as the "Zombie Combo".
Hidan had medium length silver hair slicked back with distinctive purple eyes. He wore his Akatsuki cloak open with no shirt, only pants under it revealing his Yugakure forehead protector around his neck and Jashin amulet. He also wore dark green nail polish and his orange Akatsuki ring on his left index finger, which bears the kanji for Three. When not fighting, he was always seen with his Triple-Bladed Scythe on his back. A part of his left ear was also cut off after his fight with Asuma.
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. 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 for forgiveness. 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" 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, even commenting to Shikamaru Nara that "I've been waiting for this".
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. 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 as punishment for underestimating his opponents. After his head was reattached, he showed a great hatred towards Asuma.
Hidan was a powerful S-rank missing-nin whose skills were enough for him to be accepted into Akatsuki. Along with his partner Kakuzu, he was able to capture the jinchūriki of the Two-Tails, Yugito Nii, despite her transforming into the Two-Tails.