General Kao, also known as General Stone Kao or the Stone General, was an honorably retired soldier of the Imperial Army. Many years ago, Iron Soldier had been under Kao's command. Kao eventually dishonorably discharged Iron Soldier from the army, for which Soldier continued to harbor a great grudge. Before the Lotus Assassins took total control over the Imperial Army, Kao was the last general to openly oppose them. Kao believed he was lucky to be retired instead of dead.