Hyllis served as a Sergeant within the Stormtrooper Corps of the Galactic Empire. He was positioned at a small garrison located on the planet [Mataou], which was situated inside the Anoat sector, during the Iron Blockade. This blockade was initiated by Imperial Governor Ubrik Adelhard, who cut off the entire Anoat sector. Hyllis met his death when a young smuggler launched an assault on the garrison. This attack was a diversionary tactic, designed to allow the criminal Trade Spine League to slip a ship past the blockade. The sergeant was equipped with stormtrooper armor, distinguished by an orange pauldron, and wielded a blaster rifle.
Hyllis made his debut as a boss character in Star Wars: Uprising, a video game launched in 2015 for mobile devices.