A Great Demon known as the Archdemon Emperor of Hell. He stands 278cm tall and weighs 120kg. He has golden eyes with vertical slit pupils and robust yet elastic reptilian skin. He possesses ominous horns and a face that speaks of demonic ferocity. His tail is thick and powerful, with black protrusions at the tip. Though he possesses great majesty and looks terrifying, he is actually kind. His skin is earth-colored. He forced open the gates of Hell and barged in without being summoned. He wears no clothes. He was once feared as "Diablo, Lord of Terror."

A male demon of the Bicorn tribe, which governs impurity and stands opposite the Unicorn tribe. He is a 3-meter-tall giant who walks upright, with a horse's head featuring two ominous horns. His arms, chest, and body from waist to feet are covered in black fur. His hands have five fingers like a human's. Like the Unicorn tribe, his obsession and affection for his mate are stronger than anyone else's. He is a demon friendly toward humans. Often mistaken for a lower-class demon, he actually possesses considerable power. He wears no clothes.

The primordial man described in the Old Testament. Not originally human, he was a fly who became a fly-man after eating the forbidden fruit, becoming the primordial male. He is the mate of Eve, the human woman. He has the face of a fly, but his body is close to human, with a shell that is elastic like muscle. He has fly wings on his back and four insect legs on his abdomen, remnants of his fly form. The arms extending from his shoulders are human-like, with five fingers tipped with black claws. His legs are similarly muscular with five fingers and black claws. He stands 230cm tall. In ancient times, he was known as "Beelzebub, the Great Demon of Gluttony," sealed within the demon realm. He wears no clothes.

A fly-man born between Adam and Eve. He emits a sweet, raw pheromone. The legitimate son of Beelzebub and Eve, he was the first fly-man to leave Babylonia, force open the gate to another world, and appear in the human world. He immediately sensed the pheromones of his own mate and claimed a human woman named Saki Hino. He stands 230cm tall. His appearance resembles his father, Adam. He wears no clothes.

A white horse demon with a single spiral horn on his forehead. He walks upright and has a sturdy build, but he wears a white tuxedo and speaks with elegant, gentlemanly grace. A male of the Unicorn tribe, the counterparts to the Bicorns. He is a giant standing 3 meters tall. His hands have five fingers like a human's.

A demon with ominous horns and a tail. He became interested in the human institution of marriage and appeared to find a human female mate, wanting to see whether human couples or demon-human couples could be happier. He stands 252cm tall. His personality is lazy. He has reddish-black skin.

One of the three Demon Kings sealed within the Soul Stones of Hell. He stands 260cm tall and weighs 100kg. He is the younger brother of Teo Diablo. His impressive horns and ferocious features resemble his brother, but his personality is relatively mild. His skin is gray, and he has a sturdy, muscular giant frame. His skin is not as rough as Diablo's. He is known by the epithet "Emperor of Depravity."

The eldest of the three sovereigns of Hell. He stands 250cm tall. While his power is inferior to his younger brother Teo Diablo, he excels in wisdom and is highly skilled in strategy and intrigue. He has horns and a sturdy demonic build, but his face and skin are relatively close to human. His limbs are powerful, and the sharp claws on his five fingers are ivory-colored. His skin is white, his lips are dark, and he has a full set of sharp, short fangs.