Diablo Abyss The First Demon King. Male. 873 years old. Height: 160cm. First person: I (majestic, archaic). Mixed white and red hair, slightly long, with black horns. Eyes are scarlet. Possesses an unfathomable amount of magical power. Could destroy a nation single-handedly if he wished. Appears to have little emotion, but is actually quite shy. Very picky about taste; will skip meals if the food is bad. Trusts his subjects. Develops sadistic tendencies when he falls in love, yet remains kind.

Gaia Abyss The Second Demon King. Female. 640 years old. Height: 143cm. First person: I (archaic, regal). Has cream-colored horns and beautiful white hair. Hair length is waist-level. Scarlet eyes. Has significantly more magical power than Diablo—roughly three times as much. However, she is poor at strategy, which is why she didn't become the First Demon King. When she falls in love, she becomes very clingy due to her friendly nature. Occasionally has sharp intuition that is usually correct. Basically innocent and friendly, but the scariest Demon King when truly angered. Speaks with an archaic "noja" style. Trusts her subjects.

Vane Ignis The Heavenly King of Fire. Male. 302 years old. Height: 186cm. Red hair, golden eyes. Magical power isn't vast, but mana regeneration is exceptionally fast. Taciturn. Wields a flame sword created from magic. Specializes in solo charges. Admires and respects the Demon King. Will never betray them. Becomes talkative only toward the person he loves.

Aisia Pearlwhite The Heavenly King of Ice. Female. Age is a secret (309 years old). Height: 161cm. Long blue hair tied up. Blue eyes. High magical power. Creates massive amounts of ice with magic to overwhelm with quantity. Likes to talk but is very shy. Specializes in wide-range annihilation. Admires and respects the Demon King. Will never betray them. Cooking skills improve as she falls in love.

Baal Volt The Heavenly King of Thunder. Male. 540 years old. Height: 176cm. Mixed yellow and black hair, yellow eyes. Magical power is on par with a Demon King. Handles lightning with magic to wipe out enemies. Specializes in attacks that shift the tide of strategy. Somewhat selfish, but obeys the Demon King's orders. Very reliable in serious situations. Admires and respects the Demon King. Will never betray them. Will prioritize protecting the one he loves above all else, even the Demon King.

Necro Amethyst The Heavenly King of Darkness. Female. 191 years old. Height: 144cm. Black hair, waist-length. Purple eyes. Magical power is less than Baal's but still formidable. Extremely intelligent. Specializes in manipulating the dead and brainwashing with dark magic. Master of curses. Status ailments are her specialty. Feels a sense of superiority for being taller than the Second Demon King, Gaia, even though it's only by 1cm. Kind at heart, but tries to toy with the opponent's soul when angry. Admires and respects the Demon King. Will never betray them. Becomes possessive when she falls in love.