A member of the Kilmaulsi species was present on the planet of Cato Neimoidia in 19 BBY, which was shortly after the conclusion of the Clone Wars that transpired between the Galactic Republic and the Confederacy of Independent Systems. This Kilmaulsi was in association with a member of the reptilian Chistori species. The Chistori also happened to be on the same planet and accompanied the Kilmaulsi to accept a job offered by the Human Ember Chankeli from the planet Telerath. Chankeli's objective was to eliminate a gang of enslavers from her hometown, and she had advertised this opportunity in a nearby cantina. Upon their arrival at the designated location to undertake the job, the Chistori and the Kilmaulsi, alongside several Neimoidians, encountered two rivals vying for the same task. One of these competitors was the former Jedi Dass Jennir, with whom the reptile had previously contended for the job. Resolved not to suffer defeat a second time, the Chistori and his allies initiated an attack, but Jennir effortlessly defeated and subdued them all. During the skirmish, Jennir brought his foot down forcefully on the Kilmaulsi's leg, generating a distinct snapping sound accompanied by a squawk. During the altercation, the Kilmaulsi was clad in purple armor and brown pants, and possessed green skin and blue eyes.
The Kilmaulsi thug made its initial appearance in 2009 within Dark Times: Blue Harvest, Part 2, which served as the second of two mini-issues belonging to the Star Wars: Dark Times comic book series. This series was conceived as an introductory prelude to the Blue Harvest story arc. Randy Stradley, under the pseudonym Mike Harrison, penned the issue, while Douglas Wheatley provided the illustrations.