Hakuei Ren is a Dungeon Capturer, as well as the first Princess of the Kou Empire. She is the owner of the Djinn, Paimon.
She is an average height girl with long hair. She have a mole in the same place as Hakuryuu and their mother, Gyokuen Ren.During the World Exploration arc she shows a lot of scars on her body.
Hakuei has a strong sense of justice. She treasures Hakuryuu Ren alot. She is a pacifist and doesn't wish to wage wars. She takes over as Hakuryuu’s mother, she made sure that Hakuryuu will be able to do everything on his own, which includes cooking.