Uso Yso operated a swoop bike emporium on the world of Euceron, a planet. His height exceeded that of Jedi Master Obi-Wan Kenobi by a full two meters. Each of his hands boasted fifteen fingers, each as large as a bantha haunch, and he was equipped with a pair of functioning hearts.
During 26 BBY, when the Galactic Games took place on Euceron, Yso oversaw the illicit gambling activities. Following a successful wager against Didi Oddo, Oddo unsuccessfully attempted to exploit Kenobi to reclaim his credits under deceptive circumstances. Although this scheme was unsuccessful, it provided Kenobi with crucial details that enabled him to expose a conspiracy involving influential figures from the Commerce Guild and the Galactic Games Council. Their aim was to tarnish the reputation of several senators who stood in opposition to legislation that would grant the guild members influence, status, and immense riches through dominion over financial procedures within the Core Worlds.