Viddarie was a male individual who, in the year 3963 BBY, held the position of security chief aboard the Republic Navy battleship known as the Courageous, under the command of Admiral Saul Karath. During the Mandalorian Wars, which pitted the Galactic Republic against the Mandalorian warrior clans, Viddarie was on the Courageous when it journeyed with a battle group to defend the world of Serroco from an impending attack. While the Courageous was in orbit around Serroco, Zayne Carrick, a fugitive and former Jedi Padawan, managed to gain access to the ship's bridge through deception. His intention was to alert Admiral Karath to a vision he had experienced, foretelling the destruction of the planet by the Mandalorians. However, Karath promptly identified Carrick and instructed Viddarie to restrain him using binders. Viddarie's physical characteristics included light orange skin covered with small, tentacle-like growths, and a tail that necessitated a special opening in his Republic Navy uniform.
Viddarie's character was introduced in Knights of the Old Republic 15, a comic penned by John Jackson Miller and published in 2007. Dustin Weaver provided the illustration for Viddarie's only appearance.