Rias is a beautiful young woman with a voluptuous body, white skin, blue eyes. Her most distinctive feature is her long, beautiful crimson hair. Rias is a very kind and compassionate, optimist, especially to her servants and people close to her. She gets angry and violent whenever people insult her or her peerage, showing a fiery side to her. This also plays into the fact that she dislikes cruelty towards people. She is also a Devil from the Underworld and the heiress of the Gremory clan.