Kakuzu is very antisocial in nature. He cares nothing about people, except that he can take their hearts to extend his own lifespan and money they may be worth as a bounty. He has also killed numerous partners in the Akatsuki until he was partnered with Hidan, whom is immortal. Even then Kakuzu swears that he will find a way kill Hidan one day. Though Kakuzu appears to not have always been this way. He was once a powerful ninja from Takiagakure. After he had failed his mission to kill the first Hokage, his village shunned him and he responded by killing the village elders and taking their hearts. This behavior seems to reflect a controlling nature. When he became upset by things not going the way he wanted, Kakuzu would kill the person responsible such as his former partners and village elders. This would also explain Kakuzu’s love of money. He makes a good portion of money bounty hunting, and was even made the Akatsuki Treasurer. Kakuzu regards money as the only dependable thing in the world. This is because he can control money and use it as he pleases, whereas people do whatever they want.