Lonni was a passenger aboard the spacecraft Misanthrope, which suffered a catastrophic failure and crash-landed on the world of D'vouran. She was a companion to the pilot, Kevreb Bebo, and found herself stranded on the planet alongside him and eighteen other individuals who survived the crash. The planet upon which they landed was absent from the starcharts, due to its creation as a component of the clandestine Project Starscream.
Lonni and Bebo were among the initial twenty survivors of the crash, but the population dwindled as people mysteriously disappeared. While awaiting rescue, the remaining survivors stumbled upon a derelict Imperial laboratory, which they then occupied. Eventually, Lonni and Bebo were the only ones left. The indigenous Enzeen people informed them that the Imperials held Bebo responsible for the crash, effectively sentencing him and Lonni to permanent residency on D'vouran. As new settlers began arriving on the planet, Bebo felt compelled to warn them about the disappearances. Having discovered a "follower" that prevented his own disappearance, he attempted to alert the settlers, but they dismissed him as insane.
In the year 0 ABY, Mammon Hoole, DV-9, Tash, and Zak Arranda journeyed to D'vouran and encountered Bebo. One day, as Bebo and Lonni strolled through the Enzeen settlement, Lonni vanished in an instant. All traces of her footsteps had disappeared. Furthermore, Chood, a leader among the Enzeen, conveyed to Hoole and his companions that Lonni had never existed, citing the absence of footprints as proof. The planet had consumed Lonni, but Chood attributed the event to Bebo's mental instability.
Seeking to understand Bebo's narrative, Tash accompanied him to the laboratory, where he revealed his "follower" to her. There, she witnessed a hologram depicting Lonni.