リアス・グレモリー, Riasu Guremorī

Also known as the Crimson-haired Ruin Princess, Rias is the sister to the current serving Lucifer Sir Zechs and heiress of the Gremory name. Though the Gremory name carries great political power in the Demon World Rias herself is opposed to most politics and prefers to keep her title out of most matters.

Rias is known as a very kind master to her servants, though when angered or provoked her wrath can be cataclysmic. She has always been deeply conflicted between her own desires and the duties required of her station as the next head of the Gremory Family. In a later story ark her arranged marriage with another prominent family is challenged when her servant family, led by Issei, challenges her would be suitor to an open duel which he wins (barely).