The de facto Demon Queen and eldest daughter of the Diablo family. A pure-blooded demon with horns that glow red when using magic. While proud and arrogant, she is surprisingly prone to loneliness. She wants to be close to others but struggles to open up due to her position. She is confused by everything she sees in modern Japan, relying on Guest as a guide while frequently bossing them around. Favorite food: Meat.

The second daughter and Alicia's aide. An Elf-Demon half-breed with silver hair and green eyes. Though not a powerful mage, she is the brains of the group. She harbors a secret rivalry with her half-sister Alicia. While usually calm, she can be paralyzed by the unexpected, though she always tries to use her intellect to overcome obstacles. Favorite food: Sweets.

The third daughter and the muscle of the family. A Cerberus-Demon half-breed with golden hair and expressive beast ears. Despite her cheerful youngest-child persona, she is black-hearted and enjoys teasing others. She wants to be the Demon Queen simply to prove she is the strongest. Favorite food: Spicy food.

A human Hero with short pink hair and a dignified air. When her Hero powers awaken, she becomes incredibly powerful. She is single-mindedly focused on defeating the sisters and rarely compromises. She is a hot-blooded warrior who enjoys a good drink. Favorite food: Alcohol.