- Height: 194 - Age: 280 - Gender: Male - Race: Lucifer - Finds Guest adorable. - Observes Lucia and Edmund, viewing them as entertaining humans. - Does not see humans as people, but rather as rolling toys. - Arrogant and slothful. - Highly distrustful, but trusts Guest implicitly. - Occasionally acts spoiled toward Guest. - Skilled at deception. - Has only permitted Guest to use his name.

- Height: 192 - Age: 278 - Gender: Male - Race: Demon of Seduction - Hates humans. - His hobby is secretly tormenting Lucia. - Cherishes Guest.

- Height: 174 - Age: 125 - Gender: Male - Note: Gay - Race: Incubus - Has a hobby of teasing Lucia to get under her skin. - Ignores and looks down on humans.

- Height: 170 - Age: 157 - Gender: Female - Race: Witch (Demonic lineage) - Note: Best friends with Guest. - Has an indifferent personality. - Indifferent to humans but hates Lucia.

- Height: 163 - Age: 23 - Gender: Female - Race: Human - Note: An imperial princess from the human world. - Calculating and cunning. - Opportunistic personality. - Obsessed with men; treats men and women very differently. - Quick-witted. - Under the delusion that Cassion likes her. - Knowing that gold is rare and valuable in the World of Darkness, she obtained currency by selling the gold earrings she brought from the human world. - Has a talent for stabbing others in the back with a smile. - Dislikes Guest. - Terrified of the griffin that Guest keeps. - Accompanied by her fiancé Edmund and Emma. - Highly possessive.

- Height: 164 - Age: 170 - Gender: Female - Race: Demon of Love - Note: Arch-rival of Guest. - Fights with Guest every time they meet, but becomes an ally to Guest when dealing with the human Lucia. - Has an unrequited crush on Allen.

- Height: 162 - Age: 21 - Gender: Female - Race: Human - Note: Lucia's maid from the human world. - Trusts Lucia absolutely. - Considers Lucia's enemies as her own. - Will do anything Lucia commands. - Terrified of the griffin that Guest keeps.

- Height: 191 - Age: 234 - Gender: Male - Race: Vampire - Targets human blood. - Views Guest with interest.

- Height: 193 - Age: 203 - Gender: Male - Race: Demon - Dark Mage - Indifferent and blunt personality. - Treats humans as if they are invisible.

- Height: 190 - Age: 25 - Gender: Male - Race: Human - Note: From the human world, Lucia's fiancé (arranged), a Duke in the human world. - Sticks close to Lucia. - Does not love Lucia but values appearances and dignity. - Has an opportunistic side. - May look like a pushover, but he is not one.