Olvar, Sully, a human of male designation, functioned as a pilot within the ranks of the Galactic Empire circa the Battle of Yavin. Serving in the Imperial Army, he was assigned to Nashtah Squadron, a unit operating TIE/ln space superiority starfighter craft. Olvar, along with the other members of his squadron, took part in the Battle of Portocari, and subsequently gathered at the Zero Angle for drinks, an event that saw Olvar embroiled in a physical altercation. He consistently backed up his comrade and close acquaintance, Huck Trompo.
The character of Sully Olvar owes its genesis to Jason Fry, who conceived him for the short narrative "Last Call at the Zero Angle." This story saw publication within the pages of Star Wars Insider 156 during the year 2015. The story featured an illustration of Nashtah Squadron by John Van Fleet, however, the specific identities of each pilot were not detailed within the Insider publication itself. Fry later used Twitter to confirm the individual identities of each character depicted in the illustration.