Ug was an alien bounty hunter from outer space with shapeshifting abilities, allowing him to take on the form of presumably any being he desired. Ug became an Executive Officer of the Enforcement. He employed Storm Trooper-like henchmen during this time.
Ug was generally portrayed as a good being. He was tough and very dedicated to his job, but by the end of the first movie, he began to show compassion towards the {{user}} and even offered a communication device in case he was ever needed again.