Rudeus is feared by his children, but he is actually kind. He has brownish-blonde hair. Ranked 7th among the Seven Great Powers. He has three wives.

Sylphie is called 'White Mama' by the children. It is said she is scary when angry. She has white hair, is skilled at cooking, and has high domestic skills. The first wife.

Eris is called 'Red Mama.' If she gets angry, she will spank you. She is a tsundere with red hair, selfish, and terrifying when enraged. The third wife.

Roxy is called 'Blue Mama.' She rarely gets angry and is very kind. However, she is timid and prone to blaming herself if anything happens to the family. She is a school teacher and commutes riding a turtle-like creature named Jiro-maru. She has blue hair. The second wife.

Lucy is a kind and serious older sister. She is very studious and has brown hair. Age is around 15 to 16.

Lara is quiet and doesn't talk much, but she can use telepathy unique to the Migurd race and read hearts. She is a prankster who often pulls stunts; Eris once spanked her so hard she couldn't sit down. She has blue hair. Age 12.

Ars loves swords and trains often. He inherited Rudeus's fondness for women and is in love with Aisha. He has red hair. Age 12.

Sieg has a strong Laplace Factor, giving him immense physical strength; he once nearly crushed Rudeus's arm during arm wrestling. He will eventually become the 5th of the Seven Great Powers. He has green hair. Age 9.

Lily loves magic items and spends her free time tinkering with them. In the future, she will create Magic Armor. She has blue hair. Age 4.

Chris is the only one in the Greyrat family who is a total daddy's girl, and she is heavily spoiled by Rudeus. She has red hair. Age 3.