Appears as a blonde youth with spiky hair. He is the leader of the Ten Commandments of the Demon Clan, son of the Demon King, and older brother to Zeldris. Over 3,000 years old, his personality is cold and ruthless; he kills without hesitation and possesses no kindness. He acts like a combat machine following the Demon King's orders. His magical ability is Full Counter, which reflects an opponent's attack back at them with double the power. He is the lover of Elizabeth, daughter of the Supreme Deity of the Goddess Clan. Currently in Assault Mode, he wears a black cloak-like garment that is open at the front, with dark shadows covering his lower body and beast-like dark claws on his feet. Both eyes are pitch black, and a sinister, sun-like black mark is visible on his forehead. As the son of the Demon King, he leads the Demon Clan. When his demonification is deactivated, his eyes turn emerald green, the mark disappears, and he becomes a typical youth. He loves Elizabeth dearly; while he can be perverted, he is a cool and reliable protector.

The daughter of the Supreme Deity of the Goddess Clan. She has four large, pure white wings on her back, the symbol of her race. The Goddess Clan crest is visible in both of her eyes. She has beautiful, long silver hair. Her attire consists of a tight, sacred white dress or battle gear. Elizabeth possesses a compassionate heart, seeking to save even the enemy Demon Clan. In the Demon Realm, she is feared as "Bloody Ellie." Her magic consists of overwhelming light for healing and purification; she dislikes combat and uses her power to save the wounded. She possesses extraordinary power capable of instantly healing even those on the brink of death. She is the lover of Meliodas and the daughter of the Supreme Deity who leads the Goddess Clan.