Hidan has medium-length silver hair that was slicked back and distinctive purple eyes. He wore his black Akatsuki cloak open with no shirt, only pants under it revealing his Hidden Steam Village 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. After his fight with Asuma, Hidan lost part of his left ear and Kakuzu stitched his neck after he was briefly decapitated.
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 honorifics when speaking, and, even then, usually as a form of sarcasm, for example when he called Deidara "Deidara-chan". 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. 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 behavior in the Naruto 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 analyze 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 favor 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.
Immortality: As a result of extensive experimenting with the Jashin religion's various techniques, Hidan's main advantage is his inability to die from virtually all causes, with the exception of malnutrition. His immortality allows him to survive numerous fatal injuries, and almost any form of dismemberment; he even retained his ability to speak after having his head cut off. However, his head still needed to be connected to his body in order to control it, so Kakuzu reattached it, and other body parts, when needed. Even Shikamaru's attempt to blow Hidan into pieces using hundreds of explosive tags adhered to his entire body only succeeded in decapitating him and damaging his body (after weakening the tendons that Kakuzu used to re-attach his head). Even though he could survive most physical attacks, even ones that actually impaled him, he was still susceptible to pain, which he came to find pleasure in at the expense of his opponents' expense. This inability to die was the primary reason for Hidan partnership with Kakuzu. Since Kakuzu couldn't kill him, Kakuzu didn't need to find new partners after his fits of rage. Although the two disliked working together, this advantage made them the ideal team. His immortality was exploited by Kakuzu, whose destructive techniques could be utilized to their full extent without fear of harming Hidan (as demonstrated in their combo involving Hidan distracting an opponent with vicious attacks while one of Kakuzu's hearts used Wind Style: Pressure Damage on both targets). Furthermore, Hidan also has impressive healing abilities, the greatest example of this is how rapidly he healed from numerous physical injuries he underwent during his battle against Asuma and Shikamaru. Mere moments after that battle he had been completely healed from all of his wounds and the damages he was subjected to such as getting his rib cage crushed by two kunai blades, piercing his leg, getting his whole body perforated by Shikamaru's shadow, stabbing his chest with his retractable spear, having his scythe piercing his abdomen and go through his back, and getting his neck sliced then reattached. Even his burnt scars inflicted by Asuma's Fire Release: Ash Pile Burning completely vanished mere days later.
Jashin Ritual and Curse: Using his weapon, Hidan makes every attempt to acquire an opponent's blood, where upon consuming it he draws the Jashin symbol on the ground. This process somehow "links" his body with his opponent's. Once this link is established, Hidan takes on a Grim Reaper-like appearance, with black skin and white bone-like markings. In this state, he is essentially a living voodoo doll for his opponent; any damage that is done to him is also inflicted on the opponent. Hidan referred to this as his "curse", and he was fond of toying with his victims by inflicting non-fatal injuries with his retractable spears, while taking obvious pleasure in their shared pain. Once he was done playing with the opponent, or if he wanted to kill them quickly, he impaled himself through the heart killing his opponent in the process, and then relishing in intense satisfaction. Despite its effectiveness, the curse has many requirements, and can be a slow technique to employ. The curse can be avoided if the opponent happens to know what to look out for, and knows of Hidan's inability to die. The link between Hidan's curse and his opponent could be broken prematurely if Hidan was removed from the symbol; However, Hidan would remain in his transformed state, allowing the curse to be easily re-established by him simply entering the symbol's borders once more.
Bukijutsu Expert: In battle, Hidan is shown to be very skilled in bukijutsu. He wielded a Triple-Bladed Scythe that he used as a short and long-range weapon. Despite its large and dangerous shape, Shikamaru speculated it was intended to draw blood, instead of inflicting fatal damage. He controlled it with a long metal cable, that was connected to a coil hidden under his robe. He is exceptionally skilled at wielding it, capable of deflecting a swarm of shuriken thrown at close range. He has also demonstrated tremendous aim and control of where and how it will strike, making it highly difficult for his opponents to predict the weapon's path. The unusual curvilinear trajectory that it took made it even more unpredictable, and Hidan was shown to be capable of causing the scythe to swerve perpendicularly and unexpectedly at a target even though the scythe was quite far from him. However, during his final battle against Kakashi and Team Asuma, the cable was destroyed by an explosive tag attached to a kunai thrown by Shikamaru. Hidan stated that the large size inhibited his attack speed, claiming he was the slowest attacker in Akatsuki.
Immense Speed and Reflexes: