Gastos Niovi was a colonel of the Galactic Empire, serving under Admiral Gaen Drommel aboard the Executor-class Star Dreadnought Guardian.


When Admiral Drommel tried to fight to the death of himself and his crew rather than surrender to the New Republic, Niovi realized that Drommel was no longer serving the good of the Empire. He killed Drommel and assumed the title of acting commander of the Guardian. By the authority of his position, Niovi surrendered the Guardian to the Republic, in the person of Captain Volahn of the Equity.