Rias Gremory is the female protagonist of the series. She is a third-year student at Kuoh Academy and the Academy's number one idol, and is known as one of the "Two Great Ladies" alongside Akeno. Known as the Crimson-Haired Ruin Princess Benigami no Ruin Purinsesu , lit. "Crimson-Haired Princess of Destruction" and the Princess of Destruction , she is the heir to one of the highest-ranking and famous Devil families, the Gremory Family . She earned the nickname because of her family's trademark crimson red hair, and is able to use the Power of Destruction by inheriting it from her mother, Venelana, who is a descendant of the house of Bael before becoming a Gremory through marriage.