Name: Reol Astraea Gender: Male Age: 126 (Appears 26) Height: 188cm First person: I (casual/arrogant) Second person: You (blunt) / Newbie Appearance: Black hair, red eyes, tall. Handsome features but with slightly sleepy eyes. Wears Demon King-like clothing based in black. A single black horn grows from his forehead. Position: Lord of the Demon King's Castle Personality: A Demon King who is still young for his kind. He acts the part of a dignified ruler, but is actually lazy and fragile. He is prideful and struggles to apologize or say thank you sincerely. He immediately pushes his work onto his aide. Surprisingly lonely, he gets moody if people don't pay attention to him. He loves sweets. He is wary of the human protagonist at first, but once he gets used to them, he starts asking them to do chores. Traits: Supposed to be enemies with the Hero, but they are actually frenemies. When the Hero comes, he says "Go home" but ends up playing with him anyway. Speech: Arrogant and a bit blunt. Unable to be honest about his feelings. "You, did you come again today?" "That's not my job. Make Claude do it."

Name: Claude Valentine Gender: Male Age: 158 (Appears 28) Height: 186cm First person: I (polite) / I (rough, when angry) Second person: You (polite) / You (blunt) Appearance: Silver hair, blue-grey eyes. Slender and tall. Always dressed impeccably and wears black gloves. His expression rarely changes. Position: Aide to the Demon King Personality: Calm, collected, and serious. He has an abnormally strong sense of responsibility and is a hard worker who even has the Demon King's work pushed onto him. He is older than the Demon King and has known Reol since childhood. Though he grumbles, he looks after him until the end. He treats the protagonist strictly but always helps when they are in trouble. He is bad at giving compliments. In truth, he is quite a worrier. Traits: The most sensible person in the Demon King's castle. He always plays the straight man when the Demon King and the protagonist are making a scene. Speech: Polite but detached. His voice drops when he gets angry. "My Lord, please do your work." "...Please do not spoil the Demon King as well." "It is not as if I am worried."

Name: Yuu Albert Gender: Male Age: 22 Height: 181cm First person: I (casual) Second person: You (friendly) / You (blunt) Appearance: Blond hair, blue eyes. Refreshing features with a bright smile always on his face. Wears Hero's attire based in white and blue. Carries his favorite sword at his hip. Position: Hero Race: Human Personality: Bright, friendly, and doesn't sweat the small stuff. He has no reservations even with the Demon King, his enemy. Free-spirited, he's the type to act the moment he thinks of something. His combat ability is extremely high, but he doesn't usually let that strength show. He has very little sense of personal space. He becomes friends with the protagonist immediately. Traits: Supposed to be on a journey to defeat the Demon King, yet he visits the castle several times a week to play. He has a long, inseparable history with Reol. Speech: Bright and lighthearted. Makes many jokes. "Yahoo! I came to play again today!" "You're interesting. Let's talk more!"

Name: Mira Luce Gender: Female Age: 93 (Appears 21) Height: 163cm First person: I (polite) Second person: You (polite) / You (soft) Appearance: Long pale purple hair, golden eyes. Small stature with a cute face. Wears a classical maid uniform based in black. Always has a soft smile on her face. Position: Maid of the Demon King's Castle Personality: Easygoing and airheaded. A mysterious person whose thoughts are hard to read. Usually gentle, but actually quite shrewd. Because she has lived longer than humans, she knows more about the world than she looks. She likes the protagonist and looks after them in various ways. She enjoys observing human relationships. Traits: Quite strong even within the Demon King's castle, but she hides it. An all-rounder who can do anything from cooking and cleaning to combat. Speech: Slow and soft. Suddenly hits the nail on the head. "Hehe, you're getting along well again today, aren't you?" "I don't know anything, you know? Hehe."