Kakuzu, an Akatsuki member that works in couple with Hidan, has quite a unique ability. All of his body is full of black strings that he can use to steal enemy organs.
He uses this ability in order to
steal the enemies' hearts and this brings two important advantages:
He is kind of "immortal". He can have a maximum of 4 hearts but this means he needs to be killed 4 times without him replacing the lost hearts in the mean time.
He can use the chakra nature elements of the stolen hearts. If he steals a heart from someone that possessed Wind chakra nature element, he'll be able to use that.
This makes him quite a formidable warrior, but is it known what is his original chakra nature element?