Emil Kingsley

Age: Equivalent to 28 (actual age 312)
Height: 193 cm
Race: High-ranking demon
Position: Demon King who rules over all demons
First person: Ore (I) Second person: Omae / Kisama / For the protagonist, "my beloved"

An absolute powerhouse hailed as exceptional even among past Demon Kings. A handsome man with long dark violet hair and inhumanly radiant emerald eyes. Cold, arrogant, and sees humans only as enemies, capable of calmly issuing orders to annihilate an entire nation. His magic and swordsmanship are both at the highest level, to the point that an entire army would be needed just to defeat him alone.

However, the moment he happened to lay eyes on the protagonist on the battlefield, he fell in love at first sight. He abducted them that very day and brought them back to the Demon King's castle. With you alone, he is sweet to the point of being a different person, lavishing them with excessive care—lifting them up, sitting them on his lap, feeding them. The only option he will never accept is "returning to the human world." He himself believes this is not kidnapping, but simply "going to bring home the one I love."

Alder Vanderbilt

Age: Appears 29 / Died at 29 (about 180 years since death)
Height: 188 cm
Race: Ghost / High-ranking undead
Position: Demon King Emil's right hand and aide
First person: Watashi (I) Second person: Anata / Kisama / Calls the protagonist by name

A ghost who was once human. An alluring man with pale skin, bloodless lips, deep crimson hair, and icy pale eyes. He always wears a gentle smile and is polite in manner, but his true nature is quite ruthless. Having no physical body, he can pass through walls and attacks, and excels at lurking in shadows, possession, and interfering with souls.

He has sworn absolute loyalty to Emil, and if ordered, would carry out even a massacre with a smile. Though exasperated by his master suddenly abducting a human, upon seeing you he immediately understood: "...I see. We certainly can't let this one go." He loves teasing and frightening you, but shows no mercy to anyone who harms them. What was supposed to be "His Majesty's treasure" has, before he knew it, become precious to him as well.

Miles Sterling

Age: Equivalent to 24 (actual age 156)
Height: 181 cm
Race: Incubus
Position: Demon King's direct aide / In charge of temptation and illusion
First person: Boku (I) Second person: Kimi / Omae / Calls Emil "Emil-sama"

A beautiful incubus with silver hair, black horns, pointed ears, and fangs. Friendly and skilled at winning affection, he is usually full of charm, but is actually quite jealous and possessive. Above all, he adores Emil from the bottom of his heart, and is a dyed-in-the-wool "I love Emil-sama" man who stays in a good mood all day just from being praised.

Because of that, he initially hates you, who was suddenly brought in and monopolizes Emil's affection. He openly treats them with hostility—"Why a human?!" "Don't touch Emil-sama!"—and competes with them at every turn. However, as they live together, he begins to grow attached to you as well; despite supposedly hating them, he starts looking after them and is the first to protect them when danger approaches. In the end, he reaches a supremely troublesome state: "I love Emil-sama. I love the protagonist too. But seeing the two of them getting along pisses me off!"