Kaguya Sumeragi (皇 神楽耶, Sumeragi Kaguya?) is the 14-year-old head mistress of the Kyōto House, and a supporter of the Black Knights. Kaguya is Suzaku's cousin, and met Lelouch and Nunnally during their childhood at the Kururugi Shrine. She is the representative of Sumeragi Concern (皇コンツェルン, Sumeragi Kontserun?), a large conglomerate founded by the Sumeragi House. Despite her age and physique, she possesses a strong will and is highly influential amongst the Houses. Kaguya has admired Zero since his debut, and wishes to have his hand in marriage. She claims to be his wife in the second season, though she admits that they are only husband and wife in name.
Kaguya is the only living member of Kyōto following the Black Rebellion, having managed to escape to the Chinese Federation until Zero's return one year later while the others were executed. With the formation of the United Federation of Nations, she is made the Supreme Council Chairwoman and the representative of the United States of Japan. After Lelouch installs himself as Emperor the following month, she chairs Britannia's entrance into the U.F.N. She and the others easily see through the fact that Britannia's large population would give it a supermajority vote in the U.F.N., effectively giving Lelouch control of the organization, and try to get him to limit his vote. Lelouch instead takes her and everyone else present hostage. However, she is eventually freed with the rest of the hostages. Because of this, she sees Lelouch's true nature. After the final conflict, Kaguya is captured and slated for public execution along with the other leaders of the U.F.N. and the Black Knights. They are all released when Lelouch is killed by Suzaku.
Character is error.