Rias Gremory (リアス・グレモリー, Riasu Guremorī) is the main female protagonist of High School DxD. She is the Gremory Clan's heiress after her oldest brother, Sirzechs, took the position of Lucifer. Rias is the sole daughter and youngest child of Zeoticus and Venelana Gremory, the aunt of Millicas Gremory, and the maternal cousin of Sairaorg and Magdaran Bael. She became known as the Crimson-Haired Ruin Princess, because of the color of her hair and Destruction. Now, Rias is a first-year College Student at Kuoh Academy, the former President of the Occult Research Club, and the school's Number-One Beauty, as well as one of Kuoh Academy's Two Great Ladies alongside Akeno Himejima. She is the master of Issei and one of his fiancées.