Ukon is Sakon's older brother and twin. The two were the apparent leader(s) of The Sound Four. To help distinguish the two, Sakon wore a beaded necklace around his neck, Ukon had a somewhat deeper voice, and their bangs were parted opposite ways - Ukon's to the left, and Sakon's to the right.
He, along with his brother, enjoys badmouthing the opposition. Despite Sakon's love for taunting and prolonging battles, Ukon is impatient and hasty, forcing Sakon to quickly end his fights.
Ukon resides inside of Sakon's body and can leave at any time, making them a deadly combination. After all, it isn't easy to attack someone with two heads, four arms - two of which can pop out anywhere, and twice the fighting power. Ukon assists Sakon by blocking and attacking, while remaining merged with his brother. However, when they seperate and attack independently Ukon tires easily since he's not used to moving on his own. The two heal quickly when merged together, leaving this an easy to solve problem.