Kertas, an alien of the female persuasion, served as a rebel spy in conjunction with her twin, Rismor. Following the advice of General Davits Draven, Kertas, together with Rismor, joined Captain Cassian Andor on a mission. This mission led them to the planet [Wecacoe], where they were tasked with retrieving Imperial security protocols.
Although Kertas and her sibling Rismor used scent to communicate, they possessed the ability to both comprehend and articulate Galactic Basic.