Koji Kiriyama was a human male officer in the Stormtrooper Corps of the Galactic Empire, hailing from the planet of Coruscant. Growing up in Imperial City during the early reign of Emperor Palpatine, Koji was propagandized into enlisting in the Imperial Armed Forces. He took part in some of the Empire's early campaigns, later fighting in the Galactic Civil War. During the conflict, he witnessed Imperial atrocities and left the Stormtrooper Corps at the rank of major. After a period of remaining neutral, Koji joined the Alliance to Restore the Republic, around 2 ABY. Following the Battle of Endor, Koji served in the ground forces of the New Republic.