Yuuki Terumi, also known as Black Susano'o, whose real name is Takehaya Susano'o, is the main antagonist of the video game series, BlazBlue alongside Relius Clover and Hades Izanami. He is a former member of the Six Heroes and the creator of the Azure Grimoire and by extension the Black Beast. He originally appeared as a non-playable character in the story mode of Calamity Trigger, but starting with Continuum Shift as the main antagonist, he became a playable character as well as his true form separated from Hazama in Chronophantasma. In Central Fiction, both Terumi and Hazama reappear as playable characters and do appear to be important characters to the story despite their status in Chronophantasma. Terumi in his true form, Susano'o, is the final boss of the story mode of Central Fiction and a playable character.