Cinsar was a Chiss male who held the rank of Senior Commander aboard the Chiss Expansionary Defense Fleet starship Steadfast. He was assigned to guide Eli Vanto, a former Imperial Lieutenant Commander sent as an emissary to the Chiss Ascendancy by Grand Admiral Thrawn. Despite not entirely enjoying his task, Cinsar respected Vanto, but nonetheless found his initial use of the Cheunh language amusing.