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As an elite ninja from Takigakure (the Village Hidden among Waterfalls), Kakuzu took on a mission to assassinate the First Hokage. This mission, however, ended in failure before the might of the First Hokage's Mokuton jutsu. Despite the insurmountable danger faced in the mission, what awaited his return to his village was the stigma and harsh punishment associated with failure of his objective. In response to this treatment, a wrong levied against a shinobi who had put life and limb on the line for his village, Kakuzu came to hold a violent hatred as he escaped from imprisonment. In his flight from the village, Kakuzu killed the village elders, took their hearts, and fled with knowledge of the village's most prized forbidden techniques.
Kakuzu is a greedy, miserly individual, often arranging goals in terms of the highest profit he can gain from them, and he is often unwilling to involve himself in something unless there is something to gain. He even remarks that money is the only dependable thing in the world; therefore, he wouldn't mind going to hell because money probably runs it too. Due to this point of view, he refers to himself as the Treasurer of Akatsuki. Given his friendly relationship with a bounty officer, it would seem he collects bounties rather frequently to earn cash, and does so (or at least tries) during his missions on several occasions. The frequent side tasks and devotion to money are both major points of contention between Hidan and Kakuzu.
Out of all the Akatsuki members, Hidan and Kakuzu display the most animosity towards each other, since neither are very fond of the other's interests. The two often trade barbs with one another, Kakuzu's usually having better timing than Hidan's. Hidan gets annoyed with Kakuzu's greed and occasional habit of doing or saying blasphemous things, such as attacking a temple and killing the head monk for the bounty on the monk's head. Kakuzu, in turn, dislikes Hidan's religion, believing the rituals associated with it to be a waste of time. Kakuzu is also rather impatient with Hidan's drawn-out speeches and battle style.
The only reason Kakuzu puts up with Hidan is because he cannot get rid of him. Due to his violent temper, Kakuzu often kills anyone close by when enraged. Hidan is, therefore, the perfect partner for Kakuzu, because of Hidan's apparent inability to die. Kakuzu's somewhat indiscriminate attack style also makes Hidan an ideal partner, since Kakuzu need not worry about catching his partner in the crossfire.
Despite his obsessive personality and violent rage, Kakuzu is much more cautious than his partner and is not as arrogant as he never mindlessly rushes into battle like Hidan. Kakuzu frequently warns Hidan not to let his guard down, and then teases Hidan when he inevitably does. Kakuzu is shown to be a keen analyst as well, which is somewhat attributable to his age. In the anime, he seems somewhat more observant, easily noticing that Shikamaru was taking his time to formulate a plan to counter Hidan's technique after the former caught his partner in his Shadow Possession Jutsu. (His age gives him several lifetimes of battle experience.) He was able to quickly discern the purpose of Shikamaru's various shadow attacks and devise ways to counter them almost instantly during battle. Despite his status as a missing-nin, Kakuzu apparently seems quite willing to follow orders. When ordered to retreat by Pain, Kakuzu complied immediately (while Hidan attempted to argue), despite the rather large bounty he could have gotten on Asuma Sarutobi. However, Kakuzu does make it a point to retrieve the case with his bounty. Although, he seems to forget the greater goals of the organization when enraged, as he attempted to kill Naruto in spite of Akatsuki's need to capture all the tailed beasts alive.
Kakuzu is a very powerful and experienced combatant with very unique skills. A mid-range combat specialist, Kakuzu can adapt to all ranges of combat quickly and easily, drawing on his lifetimes of experience to keep ahead of his opponents and outmaneuver their attacks.
The story of how Kakuzu came to walk a life of infinite time begins back in the days that the Shinobi villages were formed around the world... As an elite ninja from Takigakure (the Village Hidden Amongst Waterfalls), Kakuzu took on a mission to assassinate the Hokage. This mission, however, ended in failure before the might of the secret Mokuton jutsu. Despite the insurmountable danger faced in the mission, that which awaited upon his return to his village was the stigma and harsh punishment associated with failure. In reponse to this treatment, a wrong levied against a shinobi who had put life and limb on the line for his village, Kakuzu came to held a violent hatred as he escaped from imprisonment. And in his flight from the village, Kakuzu took with him its most prized forbidden jutsu, and along with it the every last one of the village elders hearts...
All his abilities revolve around his unique body structure, which is composed of hundreds of thick black threads woven throughout his flesh called Jiongu (地怨虞, lit. Earth Grudge Fear), holding his body together like strings of a rag-doll. This allows him to separate his body parts at will to perform long-range physical attacks and sew up almost any injury he suffers, making him very difficult to defeat. Although it is proven that Kakuzu has internal organs and blood, he somehow does not injure himself when separating his body parts in this fashion. The threads can also be used to repair the bodies of others, as seen which he reattached Deidara's arm, although Hidan's inability to die after being dismembered causes him to be Kakuzu's most frequent patient.
Most significantly, these threads have granted Kakuzu a degree of immortality (though he declines to think of it that way). The threads can pierce the flesh and bodies of others, allowing him to remove their organs and integrate them into his own body, thereby extending his life. He most commonly removes hearts in this fashion, keeping a total of five at any one time. The four extra hearts are stored in animal-shaped masks on his back. With five hearts, it means he must be killed a total of five times before he will truly die. These extra hearts also grant him numerous elemental affinities and a vast supply of chakra. The individual hearts can be released from his body and wrapped in a vast blanket of threads, forming a monstrous body with a mask as its face. These masks can move and attack independently, unleashing powerful blasts of elemental chakra from their mouths.
* Fire - A tiger-like mask, it forms a demonic bear-shaped body and can fire huge waves of flame, which spread across the ground consuming everything it touches. It can fuse with the eagle mask to create a dual fire/wind attack that is almost impossible to stop.
* Lightning - A bull-like mask with a deformed bipedal body, it can unleash deadly twin lightning bolts.
* Wind - An eagle-like mask with a strange four-legged body and thin thread wings, it can project huge hurricane-force air blasts that are capable of leveling a large region of forest. It can fuse with the tiger mask to create to more powerful attack.
* Earth - This last mask was broken by Hatake Kakashi before being seen. Kakashi confirms its earth-based nature after watching the corresponding hand seals and Iron Body techniques, and defeats it with a technique utilizing lightning chakra, the weakness of earth.
* Water - Although a Water-based mask is never displayed, Kakuzu's "original" heart (it is implied that his own has since died of old age) is assumed to be water, keeping with the trend of Takigakure ninja being aligned with Water chakra.
In addition to these many powers, Kakuzu can use his own body's threads to attack from long-range and restrain or dismember opponents. His threads can even compact together to form a giant spider-like form around him.
can't wait 2 play as him in narutaime accel 3
he would b awesone