Ring Meaning: Three (refering to the three bladed scythe)
Ring Placement: Left index finger
Partner: Kakuzu (who is killed by Kakashi)
Characteristics: Hidan is a missing-nin from an unknown village and is the second-newest member of Akatsuki, Tobi being the newest. Unlike the other members of Akatsuki, the Akatsuki leader does not seem to have Hidan's respect. Hidan belongs to the Jashin religion, a religion that worships a deity named Jashin and that condemns anything short of slaughter. Because of this, Hidan greatly dislikes needing to capture opponents alive, and makes sure to pray before battles where he cannot kill. As a part of his religion, Hidan owns a charm with an upside-down triangle inscribed inside a circle (the symbol is sometimes drawn right-side up) that he carries on a chain of beads. Hidan prays to this charm before battles and asks that he get nothing short of a kill.
Once a battle has begun, Hidan dislikes being interrupted or being forced to stop the fight, and it takes a great deal of persuasion to get him to comply. After battles, should he have time, Hidan performs a thirty-minute ritual in accordance with his religion, which seems to culminate by stabbing himself in the chest and lying upon the ground.
Although he is a member of Akatsuki, Hidan dislikes many of the formalities reacquired for the allegiance, particularly being partnered with Kakuzu. Most specifically, he dislikes the fact that Kakuzu fights solely for money. Kakuzu also dislikes their partnership, and has little patience for Hidan's time-consuming battle style and rituals. Despite this, the two remain paired together as each is able to use the other's abilities to their advantage. Additionally, Hidan doesn't seem to like the Akatsuki leader and openly disrespects him in front of others. In fact, he doesn't seem to like anyone, and has not been seen showing any respect to anyone except Jashin. He also seems to use incredibly vulgar language at most any time, while always acting in an either very confident or very agitated manner.
Hidan is apparently immortal, having been fatally wounded a number of times and even surviving decapitations while still retaining the ability to speak. Although he can survive dismemberment, Hidan needs to be connected to his body in order to control it. Despite the fact that he cannot die, Hidan openly states before battle that he wishes his opponents will be able to kill him.
Hidan's immortality is the reason for his partnership with Kakuzu, as Kakuzu has killed all of his past partners in fits of rage. Because Hidan cannot die, Kakuzu can attack Hidan all he wants without worrying about finding a new partner. This also allows for a combination of efforts between the two, as Hidan can distract enemies while Kakuzu attacks them from a distance without worrying about Hidan's safety. Kakuzu's partnership also serves as a way for Hidan to be repaired in battle, as Kakuzu's threads can sew any part of Hidan's body back into place, allowing the wounds to heal with time.
In battle, Hidan wields a three-bladed scythe that he uses as a projectile while controlling it with a rope wrapped around his wrist. Although he is capable of striking even the most talented of ninja with it, Hidan claims that the scythe makes him the slowest-attacking member of Akatsuki. The three blades on his scythe are not meant to increase the damage of his attacks, but rather to increase his chances of drawing his opponent's blood. Should the scythe become inconvenient or unavailable for this purpose, Hidan can also use a retractable pike to injure the opponent.
After acquiring some of an opponent's blood and consuming it, Hidan uses his own blood to draw the symbol on his charm on the ground. Once done, Hidan enters the symbol and undergoes a transformation, turning most of his skin black and creating white lines in roughly the same locations as his bones. Combined with his scythe, this transformation gives him the appearance of a Grim Reaper.
Later in the anime Hidan is buried alive by Shikamaru Nara.