Ex Gremory IV is a major side character appearing in the Story DxD Black Lamb. He is the leader of the Devil division in Tokyo with Aurora Lucifer working as his second in command. He is the childhood friend of Sonia Sitri, the current headmistress of Shitori Academy and the current regulator of the Academy Game System (along with the Great Satan Beelzebub). Ex is the current heir to the Gremory Household, due to his great grandfather taking on the name Satan and his grandfather being missing and his father not wanting to become the heir. He is shown to be a true prodigy to the devil society, taking on dangerous missions, and even becoming the first ranked in the Arcade Games. Him and his peerage have participated in Rating Games before, with a score of six victories and two losses, at the