Sakon (�¶‹ß, Sakon) and the older Ukon (‰E‹ß, Ukon) are twin brothers who share positions in the Sound Four. "Sakon" means left and "Ukon" means right, which is also the side of the face that each has his bangs fall on. To further help distinguish between the two Sakon wears beads around his neck and Ukon has a somewhat deeper voice. With their Soma no Ko ability, 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 sleeps, having his head protrude from the back of Sakon's neck. Because Ukon spends so much time within his brother's body he is not use to moving about on his own and tires easily when separated, forcing him to return to Sakon to regain his energy after a short time. Despite this, Ukon is a valuable asset in battle for Sakon, as his arms and legs can be used to strengthen Sakon's attacks as well as block attacks that Sakon cannot. When in their level 2 cursed seal form, each is given increased healing abilities as well as becoming ogre-like in appearance. If a limb of either of their bodies is severed, they can easily regenerate body parts.

Sakon and Ukon are very twisted and enjoy bad-mouthing the opposition. Orochimaru notes Sakon to be the fastest and strongest member of the Sound Four, traits Sakon is very proud of. When in battle Sakon likes to prolong the fight by toying with the opponent and all the while use unnecessarily powerful techniques. This tendency of Sakon's causes him to slow down the rest of the group whenever he gets interested in an opponent, making him severely more flawed than Jirobo or Kidomaru. Ukon is able to counteract this flaw by being more impatient and hasty than his brother, causing him to quickly end battles while Sakon is still trying to have fun. Sakon and Ukon fight and almost defeat Kiba Inuzuka and Akamaru. Before they can finish the two off, however, Kankuro arrives and kills them both by navigating them into one of his puppet's torso and stabbing them several times, saving Kiba and Akamaru.