Sakon and his older brother Ukon were twin brothers and the apparent leader(s) of the Sound Four. Sakon enjoyed bad-mouthing the opposition, and, like the rest of the Sound Five, he constantly referred his enemies as "trash". Orochimaru noted Sakon to be the fastest and strongest member of the Sound Four, traits Sakon was very proud of. When in battle Sakon liked to prolong the fight by toying with the opponent and use unnecessarily powerful techniques. This tendency of Sakon's caused him to slow down the rest of the group whenever he got interested in an opponent. Ukon was able to counteract this flaw by being more impatient and hasty than his brother, forcing Sakon to quickly end his battles.
With their kekkei genkai, Sakon and Ukon were able to merge with the bodies of others. Ukon generally used this ability to remain within Sakon's body where he could bring out some of his body parts to aid Sakon in battle. In addition to defending Sakon's blind-spots, he allowed Sakon to perform three armed punches and three legged kicks. The two could heal quickly when merged together. Ukon could separate from Sakon's body so that the two can attack independently, though he was not used to moving on his own for too long and thus he would tire out easily.