Yun Genda was a Sith trooper of the Human male persuasion. He found himself stationed on the planet of Taris around the time of 3956 BBY.
While serving his duty on Taris, Genda received an invitation to a social gathering in Taris's North Apartments. This party included other Sith Troopers, one of whom was Sarna. As the party progressed, Genda indulged in Tarisian ale to the point of intoxication, ultimately leading him to lose consciousness on the floor. This unfortunate circumstance was shared by all his fellow troopers who were not scheduled for duty the following day.
It is possible that Genda encountered the former Darth Revan and Carth Onasi at the aforementioned Sith gathering, although he would have been unaware of their true identities. Should such an encounter have occurred, Revan and Carth might have seized the chance to pilfer a Sith uniforms from one of the soldiers while the party attendees were in a state of unconsciousness.