Endar was a male Talarian, with a reputation as a ruthless soldier.
In 2367, he was involved in an incident with Captain Jean-Luc Picard of the USS Enterprise-D over Endar's human adoptive son, Jono, whom Captain Picard wanted returned to the Federation. After an incident where a confused and desperate Jono stabbed Captain Picard in his sleep, Picard made the decision to return Jono to Endar. (TNG episode: "Suddenly Human")
By 2381, Endar served as the Talarian Ambassador to the United Federation of Planets. During the Borg Invasion of 2381, he was on Earth to meet with Federation President Nanietta Bacco along with other Ambassadors from surrounding galactic powers. Bacco intended to rally an allied fleet to fight back the Borg; Endar pledged the support of the Talarian fleet after little resistance. (ST - Destiny novel: Mere Mortals)