Rias Gremory is the main female protagonist of High School DxD. She is the heiress of the Gremory Clan after her older brother, Sirzechs, took the title of Lucifer. She is the only daughter and youngest child of Zeoticus and Venelana Gremory, the aunt of Millicas Gremory, and the cousin of Sairaorg and Magdaran Bael. She is known as the Crimson-Haired Ruin Princess. She 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 also one of Issei's fiancées.