Primary

• Rias Gremory Friend of Akeno Himejima
• Rias Gremory In love with Issei Hyoudou
• Rias Gremory Younger Sister of Sir Zechs Lucifer

Extended

• Issei Hyoudou In love with Rias Gremory
• Akeno Himejima love rival of Raynare
• Sir Zechs Lucifer Older Brother of Rias Gremory
• Sir Zechs Lucifer Husband of Grayfia Lucifuge