Sakon (左近) and the older Ukon (右近) are twin brothers who share positions in the Sound Four. To help distinguish between the two, Sakon wears beads around his neck and Ukon has a somewhat deeper voice. With their kekkei genkai, Sakon and Ukon are able to merge with the bodies of others. Ukon generally uses this ability to remain within Sakon's body where he can bring out some of his body parts to aid Sakon in blocking or attacking. Ukon can separate from Sakon's body so that the two can attack independently, though he is not used to moving on his own and thus tires easily. In addition to combining with each other, Sakon or Ukon can merge with an opponent's body, destroying their cells from the inside to slowly kill them. While within another's body, however, they are vulnerable to whatever injuries befall upon the host, in theory allowing the host to commit suicide to kill either of the brothers. This ability also gives the two regenerative capabilities, and given enough time they can recover from any wound.