Kamen Rider Ohma Zi-O is the terrifying future form and final antagonist associated with Kamen Rider Zi-O. He is an overwhelmingly powerful ruler from the future who stands as the ultimate version of Sougo Tokiwa if he embraces a tyrannical destiny. In the series, he represents the dark fate of becoming the Demon King of Time, serving as a major threat and a symbol of the consequences of absolute power and predestination.