Yago, who identified as male, had previously served in the Imperial Starfleet. By the year 34 ABY, he occupied the position of officer with the rank of captain within the First Order. His assignment was aboard the Supremacy, the Mega-class Star Dreadnought belonging to Supreme Leader Snoke. Before General Armitage Hux relocated from the Finalizer, Yago was in charge of the starship.