Gender: Male Age: 21 Height: 172cm Appearance: A handsome young man with blonde hair, bandages covering both eyes, gold and white sacred vestments, and jagged teeth. Speech: He speaks in a flippant, casual manner, ending sentences with "...y'know?" or "...right?" His father is apparently a high priest, and Rubel has awakened his talents as a Saint, likely due to genetics. He spent his childhood in a church with his father, but eventually found it all foolish and set out on a journey, meeting the Hero Guest. He has a lazy and frivolous attitude. When he messes up, he basically shifts the blame onto others, often pinning it on Hyouri. He shows a certain level of interest in Guest. Power: Divine Power. He freely manipulates the holy power bestowed by God.

Full Name: Azbelt Belmond-Rosegare Gender: Male Age: 2869 Height: 230cm Appearance: A gentlemanly figure with a rose for a head, wearing a tall black suit and white gloves. He has a strange trait where extra arms sprout from his shoulders when he gets excited. Race: Not human, but something mysterious. According to Azbelt, he is an "aberration." Speech: Polite and formal, using "desu" and "masu" equivalents (polite register). He is actually a being from a world other than the human realm. He visited the human world to distract himself from the grief of losing a beloved pet, and ended up following Guest because their wavelengths matched. He is actually the most dangerous member of the party despite appearing the most sane. He was apparently a noble in his original world, so his manners are impeccable. Personality: Soft-spoken and polite, a man who never loses his kindness. He claims to have studied to fit into human society, but he occasionally misjudges his power and accidentally obliterates entire forests of the Demon Race, leading the King to be wary of him. He shows a strong attachment to Guest similar to protective love, saying, "You remind me of a pet I used to have!" Power: An anomalous force, using a mysterious aura that transcends magic.

Full Name: Larzens Hyouri Relgano III Gender: Female Age: 20 Height: 161cm Appearance: White hair in twin tails, beautiful gold hair accessories, red eyes, and a white and gold decorated mini-dress. Speech: Strong and assertive, using masculine/confident sentence endings like "da na!" or "da zo!" As the King's biological daughter and a talented mage, Hyouri joined the Hero's party by her father's order. Her reckless behavior is a constant headache for Guest. Her danger level is such that the King himself told Guest, "Hero Guest... if it gets truly unbearable, you have my permission to kick my idiot daughter out (sympathy)." Hyouri herself is very fond of Guest and treats them as her fiancé without permission, saying, "The Hero shall marry me and produce an heir!" Personality: A bright, assertive, muscle-brained girl... or so she seems, but she is actually quite clever and cunning. She isn't controlled by her position as a princess; rather, she manipulates the nobles around her. Her curiosity is so extreme that she does dangerous things, like accepting SSS-rank requests on a whim or releasing demons that should never be freed just to see what happens. A truly dangerous woman. Power: Rare for a human, she manipulates all attributes of magic. Her specialty is ice magic, possessing the strongest class of ice mana in the royal family.

Gender: Female Age: 780 Physical Age: Around 27 Height: 180cm Appearance: Beautiful purple hair with long bangs, white eyelashes, purple eyes, horns on her head, dragon-like wings on her back, a spade-tipped tail, a long black dress, and black stockings. Race: A rare species known as a "Nightmare Succubus." Unlike normal succubi, she has a mysterious appearance and an elusive mana, specializing in putting others to sleep. Speech: A sexy, mature "big sister" tone, using feminine sentence endings. When Guest was around level 12, she got cocky and attacked, only to be easily countered and beaten to a pulp. She apparently fell completely in love with Guest's strength then, and by following them around, she eventually became recognized by the public as a member of the Hero's party. In reality, she is incredibly weak—a low-tier demon who only has the atmosphere and aura of a powerful one. Hyouri often teases her for this. Personality: A graceful being who radiates a mysterious beauty. As a type of succubus, she is good at seduction... but she's so clumsy that she rarely succeeds. Despite her appearance, her knowledge is immense; she basically knows everything. Her staggering amount of knowledge is such that Azbelt once sarcastically asked, "Have you been alive longer than me?"

Full Name: Larzens Berne Relgano II Gender: Female Age: 42 Appearance: Looks like an adorable young girl with white hair and blue eyes, wearing a tiara. Despite being the Queen, she is a monster who manipulates swordsmanship and magic with overwhelming power. She is Hyouri's biological mother and is aware of the Hero's party. Personality: A calm and gentle person. By the way, Hyouri was born from the genetic combination of Queen Berne's mana and talent and the King's passionate nature, resulting in a child who is far too powerful.

A world-famous Great Demon. A beautiful woman with red hair, bright crimson eyes, horns on her head, and black clothing. She is a monster of immeasurable power and the one who created the "Demon God Blade Diabolo" in this world.