A Coridanite who keeps the saloon in a struggling mining settlement in 3189, cowed by the courier Zareh until the crew of the USS Discovery arrive after their jump to the future.
Os'Ir appears in Far From Home, played by David Benjamin Tomlinson, who also plays Linus. His bar is the meeting place of a community of miners living on a frozen world under the thumb of Zareh, who controls their supply of dilithium.
When Saru and Tilly walk in seeking help to repair their crashed ship, Os'Ir is suspicious and frightened. His friend Kal, who still believes in the Federation, persuades him to hear them out, and is murdered by Zareh for it.
After Georgiou and Saru overpower the gang, Saru leaves Zareh's fate to the colonists. Os'Ir sends him out into the lethal night on foot.