Onna is a Ferengi engineer and first officer of the Coldstar. She is married to that vessel's captain, the Na'kuhl Varh. During the Phoenix Prize Pack promotion, she serves as a vendor located on the Promenade at Deep Space 9.
Prior to joining the crew of the Cleaver, Onna had a husband on Ferenginar. Fed up with five years of living her life naked and rubbing her husband's lobes whenever he said so, she broke her marriage contract and struck a deal with the Orion Syndicate, booking passage to Nimbus III in exchange for a case of Romulan Ale and engineering shifts.
- "Price of Freedom: Onna is a member of a team assembled at Shangdu on Nimbus III by an Orion named Lontus to attack and capture a Risian yacht, and capture an unidentified VIP passenger to hold for ransom. The job is a failure; the yacht is heavily damaged, and the only passenger recovered is a Human infant. When Lontus attempts to leave the team for dead aboard the yacht, they disable and capture his ship, the Cleaver, and rechristen it the Coldstar. It is on this mission that she first meets Varh, the helmsman of the Cleaver, and later captain of the Coldstar.
- "Fortunes of War and Peace": Onna and Varh meet with their crew's current employer, Amarie, at Drozana Station. Amarie congratulates the two on their recent marriage, and Onna asks to get down to business. The pair successfully captured a Suliban, along with the data he had stolen from Amarie, and are prepared to hand him over. Amarie reveals that the stolen data consisted of specifications for a weapons system, to be installed on her new Amarie-class vessels. Amarie states that she believes Omag to be responsible for hiring the Suliban, and says she'll contact them if they need someone to bring him in.
- "Of Profits, and an Ill Wind": The crew of the Coldstar transports Quark through the Bajoran wormhole to the planet Karemma, which is under attack by the Hur'q. Beaming down to the planet, they are able to fend off a Hur'q attack and reach a Karemman contact.