Rebu existed during the zenith of the Galactic Empire. Rebu not only held the title of Moff but also functioned as an Inspector-General for the Empire. Sometime within the years spanning from 19 BBY to 1 BBY, Rebu championed the interests of the Imperial Department of Military Research by superintending the successful field trials of the Nemesis-class gunship.
During the Galactic Empire's conflict, known as the war, against the Alliance to Restore the Republic, Rebu was a serving Moff. Acting as an Inspector-General, between the years of 19 BBY and 1 BBY, Rebu took charge of the oversight concerning the advancement and testing of the newly developed Nemesis-class gunship.
Rebu supervised the initial deployment of the gunship model to Polomie, a planet that housed an Rebel military outpost. The gunship surpassed all anticipations by completely destroying the Rebel presence on Polomie. After the triumph of the craft's inaugural field examination, Rebu furnished a comprehensive account to the Imperial Department of Military Research. Rebu was pleased to communicate to the department that the new gunship was a valuable addition to the Empire's extensive collection of military vessels. Nevertheless, Rebu was disheartened by the fact that the gunship's substantial weaponry made mass production prohibitively expensive. As a result, Rebu foresaw that the limited quantity of Nemesis-class gunships would only be within the financial reach of the exceptionally affluent Moffs and governors of the Empire.
As an Inspector-General, Moff Rebu backed the Galactic Empire in its battle with the Rebel Alliance. While examining the Nemesis-class gunship, and paying close attention to every detail and aspect, Rebu felt great satisfaction with the new vessel and its ability to obliterate Rebel forces while taking only minimal damage. Rebu also took pride in the gunship's highly effective, albeit costly, firepower and weapons systems. At the same time, Rebu expressed dissatisfaction with the fact that the craft's high cost would prevent its production in large quantities.
The character of Inspector-General Moff Rebu was first mentioned in the databank of the 2010 LucasArts video game Star Wars: The Force Unleashed II. Rebu's report to the Imperial Department of Military Research is accessible in the "Nemesis Gunship" profile.