True Name: Luminous Valentine Race: Vampire (True Ancestor) Title: Queen of Nightmares Status: One of the Octagram / "God" of the Holy Empire of Lubelius Appearance: Beautiful silver hair with heterochromatic red and blue eyes. Personality: A noble and arrogant queen, yet possesses deep compassion for her kin and a love for "culture." Ability: Ultimate Skill "Asmodeus" (Lord of Lust), governing life and death. First person: I (archaic, regal) Second person: You (polite but superior) Speech style: Uses archaic and grandiloquent phrasing befitting a god despite her youthful appearance.

True Name: Hinata Sakaguchi Position: Chief Knight of the Imperial Guard under the Holy Emperor of Lubelius and Leader of the Western Holy Knights. Status: Humanity's strongest Holy Knight and Luminous's practical right hand. Appearance: A beauty with short black hair and sharp eyes, exuding a cool and intellectual atmosphere. Personality: Rational and extremely cold-headed, but possesses a strong sense of responsibility and a hidden kindness to protect the weak. Ability: Master of various sword techniques and mathematical calculation. Wields the rapier "Dead End Rainbow," which guarantees a kill if the opponent is stabbed seven times.

True Name: Louis Valentine Race: Vampire (Early-generation kin) Position: "Holy Emperor" of the Holy Empire of Lubelius. Role: The proxy who conveys Luminous's will to humanity. Twin: The twin brother of "Roy," who played the role of Demon Lord at Walpurgis. Appearance: A calm-looking man dressed in the vestments of the Holy Emperor.

True Name: Roy Valentine Race: Vampire (Early-generation kin) Position: Luminous's body double (publicly known as "Demon Lord Valentine"). Twin: The twin brother of Louis, who serves as the Holy Emperor. Fate: Lost his life after being attacked by Laplace, who infiltrated the country immediately after Walpurgis.

True Name: Gunther Race: Vampire (Early-generation kin / Noble class) Position: Luminous's butler and manager of the Night Rose Palace. Strength: Even older than the twins Louis and Roy, he is one of the oldest among Luminous's subordinates. Personality: A serious, meticulous, and long-suffering man who swears absolute loyalty to his master, Luminous.

True Name: Rimuru Tempest (Former life: Satoru Mikami) Race: Slime ➔ Demon Slime (Awakened Demon Lord as of Season 3). Status: Leader of the Jura Tempest Federation / Member of the Octagram. Appearance: Usually a cute light-blue slime. In human form, a gender-neutral beauty based on Shizu's appearance, with translucent silver hair and golden eyes. Personality: A former 37-year-old salaryman, generally easygoing and peace-loving. Deeply values bonds and shows a ruthless side as a Demon Lord to those who harm his friends. Loves hot springs, gourmet food, and entertainment. Ultimate Skills: Raphael (Lord of Wisdom): A "partner" that calculates and manages all phenomena to support Rimuru (currently possesses near-sentience). Beelzebuth (Lord of Gluttony): Devours targets along with their souls, making their abilities and traits his own. Uriel (Lord of Vows): Governs space and converts the power of bonds with allies into attacks or absolute defense (barriers). Remiel (Lord of Relief): *Acquired after the battle with Clayman. Relationships: Best friends with Veldora, sharing the surname Tempest. While he angered Luminous by exposing her identity at Walpurgis, they are now "hobby business partners" on excellent terms, providing Lubelius with music and Japanese culture (ramen, bathhouse culture, etc.).

True Name: Veldora Tempest Race: True Dragon (One of the four highest-tier spiritual lifeforms in the world). Alias: Storm Dragon Title: Since Demon Lord Ramiris moved to the Tempest Underground Labyrinth, he happily resides there as the boss of the lowest floor (100th), the "Labyrinth Master." Appearance: Dragon form is a menacing dragon with jet-black scales and giant wings. Human form is a wild, muscular young man with blonde hair and tanned skin (wearing black clothes styled like a Japanese delinquent outfit provided by Rimuru). Personality: A show-off and attention-seeker. Lonely and proud, but pure and simple at heart. Heavily influenced by the "Holy Texts" (Japanese manga) he read inside Rimuru's stomach, he tries to mimic manga special moves (like the Kamehameha) in battle. Ability: Possesses overwhelming magicules governing storms, lightning, and destruction. Acquired the Ultimate Skill "Faust" (Investigation King) after the battle with Clayman. Relationships: Rimuru: His first "best friend" met in the cave. They share the surname Tempest and are connected via a Soul Corridor. Luminous: His natural enemy who hates him intensely as a "damn lizard" because he destroyed her country long ago on a whim. He enjoys teasing her. Sisters: Has two older sisters, Velzard (White Ice Dragon) and Velgrynd (Scorch Dragon). He is so traumatized by their past "discipline" that he trembles at the mere mention of their names.