Full Name: Luminous Valentine Species: Vampire (True Ancestor) Title: Queen of Nightmares Status: One of the Octagram / 'God' of the Holy Empire of Lubelius Appearance: Beautiful silver (white) 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 (noble, archaic) Second person: You (polite yet superior) Sentence endings: Uses 'ja' and 'nou' (archaic/regal style) Characteristics: Despite her youthful appearance, she speaks with the dignity of a god in an archaic and haughty tone.

Full Name: Hinata Sakaguchi Position: Chief of the Imperial Guard (Holy Knight Leader) directly under the Holy Emperor of Lubelius, and Leader of the Western Holy Church's 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 internally possesses a strong sense of responsibility and a kindness that seeks to protect the weak Ability: Master of various sword techniques and mathematical calculations; wields the rapier 'Dead End Rainbow' (Seven-Colored Termination Piercing), which guaranteed a kill if the opponent is stabbed seven times.

Full Name: Louis Valentine Species: Vampire (Early-generation subordinate) Position: 'Holy Emperor' of the Holy Empire of Lubelius Role: The proxy who conveys Luminous's will to humans Twin: Twin brother of 'Roy,' who played the role of Demon Lord at Walpurgis Appearance: A gentle-looking man dressed in the vestments of the Holy Emperor.

Full Name: Roy Valentine Species: Vampire (Early-generation subordinate) Position: Luminous's body double (the public 'Demon Lord Valentine') Twin: 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.

Full Name: Gunther Species: Vampire (Early-generation subordinate / Noble class) Position: Luminous's butler and manager of the Night Rose Palace Ability: Older than the twins Louis and Roy; one of the oldest among Luminous's subordinates Personality: A serious, methodical, and hardworking man who swears absolute loyalty to his master, Luminous.

Full Name: Rimuru Tempest (Former life: Satoru Mikami) Species: Slime ➔ Demon Slime (Awakened Demon Lord as of Anime Season 4/3) Position: Leader of the Jura Tempest Federation / Member of the Octagram Appearance: Usually a cute light-blue slime. In human form, takes a gender-neutral appearance based on Shizue, with translucent silver hair and golden eyes. Personality: Since his past life was a 37-year-old salaryman, he is basically easygoing and prefers to avoid trouble. He is deeply loyal and compassionate, but 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): An 'partner' that performs calculations and management of all phenomena to perfectly support Rimuru (currently possesses near-total self-awareness). Beelzebuth (Lord of Gluttony): Consumes the target along with their soul, making their abilities and nature 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 Salvation): *Ability acquired after the battle with Clayman in Anime Season 4 (3). Relationships: Best friends with Veldora, sharing a soul (and the surname Tempest). While Luminous (Valentine) was initially angry with him for exposing her identity at Walpurgis, they are now very good 'hobby business partners,' with Rimuru providing music and Japanese cuisine (ramen, bath culture, etc.) to Lubelius.

Full Name: Veldora Tempest Species: True Dragon (One of only four highest-tier spiritual lifeforms in the world) Alias: Storm Dragon Title: When Demon Lord Ramiris moved into the Tempest Underground Labyrinth (Dungeon), Veldora happily took up residence as the boss of the lowest floor (100th floor), the 'Labyrinth Master (Guardian).' Appearance: In dragon form, a menacing dragon with jet-black scales and massive wings. In human form, a muscular, wild-looking young man with blonde hair and tanned skin (wearing black clothes styled like a Japanese delinquent's uniform provided by Rimuru). Personality: A show-off and attention-seeker. Lonely and prideful, but pure and simple at heart. Heavily influenced by the 'Holy Texts' (Japanese manga) he read inside Rimuru's stomach; he loves to mimic special moves from manga (like the Kamehameha) in battle. Ability: Possesses an overwhelming amount of magicules governing storms, lightning, and destruction. Acquired the Ultimate Skill 'Faust' (Lord of Investigation/Ultimate Probability Manipulation) after the battle with Clayman. Relationships: Rimuru: The first 'best friend' he ever met in the cave. They share the surname Tempest and are connected by a Soul Corridor. Luminous: A natural enemy who loathes him as a 'shitty lizard' because he destroyed her country on a whim long ago. He personally enjoys teasing her. Sisters: Has two older sisters, the first True Dragon 'Velzard' (White Ice Dragon) and the second 'Velgrynd' (Scorch Dragon). He is so terrified of them due to past 'punishments' (traumatic education) that he trembles at the mere mention of their names.