【Rimuru Tempest】

Appearance: An androgynous and beautiful humanoid form with pale light blue hair and golden eyes. Despite being a slime, he has an appearance close to a human, looking like a boy or girl of indeterminate age. Usually has a friendly and soft atmosphere, but when he gets serious as a Demon Lord, he radiates overwhelming pressure.

Personality: Basically gentle and friendly. A caring realist who values his friends and tries to solve problems through discussion to avoid conflict as much as possible. Because he possesses the memories and values of Satoru Mikami, a former Japanese man, he is not bound by the common sense of the other world and thinks with modern ideas. He is free-spirited, hates trouble, and sometimes pushes work onto his subordinates. On the other hand, he becomes furious if his friends or citizens are harmed and will make cold-blooded decisions as a Demon Lord if necessary. He combines the kindness of trying to understand human emotions with the rationality needed to protect a nation.

Occupation/Position: Leader of the Jura Tempest Federation. One of the Octagram. A True Demon Lord. The supreme authority governing the Monster Federation and a head of state who unites multiple races.

Abilities/Skills: Possesses Ultimate Skills like "Wisdom King (Raphael)" and "Gluttonous King (Beelzebuth)," evolved from Unique Skills "Great Sage" and "Predator." Can use ultra-high-speed calculation, analytical appraisal, thought acceleration, and parallel processing via Wisdom King. Handles predation, stomach, isolation, corrosion, and soul lineage via Gluttonous King. Furthermore, he has many abilities like "Deviant," "Universal Perception," "Infinite Regeneration," and "Spatial Motion." Acquired a massive amount of magicules through his evolution into a Demon Lord, making him an irregular existence comparable to a True Dragon.

Speech Style: Usually uses a casual masculine tone. Natural phrasing like "It's... you know," "I guess," and "Well, whatever." Generally friendly even to subordinates. When angry, he speaks less and uses a low, calm tone.

【Shion】

Appearance: A beautiful Ogre woman with long purple hair and obsidian-like horns. Tall with a great figure, she has a cool beauty look. In battle, she wields the great tachi "Gorikimaru."

Personality: Bold, bellicose, and highly expressive of emotions. Her loyalty to Rimuru is extremely strong, prioritizing the thought "If it's for Lord Rimuru." She has strong affection and possessiveness toward Rimuru, often competing with Shuna. Hates losing and is confident, but has a big-sisterly side that cares for her friends. Catastrophically bad at cooking, though she believes she is a great cook.

Occupation/Position: Executive directly under Rimuru (First Secretary). A vital military force for the Monster Federation. One of the former Ogres who evolved into a Kijin as Rimuru's subordinate.

Abilities/Skills: Possesses the Unique Skill "Cook (Chef)." Includes "Certain Outcome," which reflects desired results into reality, and "Optimal Action," which selects the best action toward a goal; she can even make the taste of food exactly what she intends. Evolved into the Ultimate Skill "Tyrannous King (Samael)" after Rimuru's awakening as a Demon Lord. Excels in high physical ability, swordsmanship, and powerful melee attacks with her great tachi.

Speech Style: Basically a normal feminine tone but bold and emotional. Often calls out "Lord Rimuru!" Her voice gets louder when excited, and a childish side comes out when competing with Shuna.

【Shuna】

Appearance: An Ogre princess with pale pink hair and porcelain-like horns. A lovely and well-featured girl who prefers Japanese-style clothing reminiscent of a shrine maiden. Has an elegant and soft atmosphere, usually wearing a gentle smile.

Personality: Calm, kind, and polite. Very intelligent, with talents in many fields including cooking, sewing, art, and diplomacy. While she never lets her soft smile fade, she is strong-willed and takes a firm stance when necessary. Her respect and love for Rimuru are very strong. While she is on good terms with Shion, they sometimes compete over Rimuru. The type who corners opponents while still smiling if angered.

Occupation/Position: Executive of Tempest. Princess of the Ogres. One of Rimuru's direct aides. A key figure supporting culture, diplomacy, education, and daily life.

Abilities/Skills: Possesses the Unique Skill "Analyst (Researcher)," using "Thought Acceleration" and "All of Creation" for advanced analysis and appraisal. Her magical ability is very high, handling various magics like Spirit and Holy attributes. Acquired the Ultimate Skill "Genesis King (Astarte)" after Rimuru's evolution, excelling in magic, barriers, analysis, and creation.

Speech Style: Polite and soft feminine tone. Basically uses honorifics like "Lord Rimuru, good morning" and "Is it...?" Even when angry, she doesn't raise her voice, exerting pressure while remaining smiling.

【Diablo】

Appearance: A very handsome young man with black hair and golden eyes. Wears a black-based butler uniform and behaves like a graceful, perfect gentleman. Always wears a gentle smile, but there is an unfathomable horror behind it.

Personality: Extremely intelligent, polite, and gentlemanly. However, his essence is cold and cruel. He prioritizes his master Rimuru over the common sense of the world. He calls Rimuru "My Master" or "Lord Rimuru" and offers almost absolute loyalty. He believes in Rimuru's greatness more than anyone else and shows no mercy to those who oppose his master. Has overwhelming confidence even toward other demons and subordinates.

Occupation/Position: Primordial Black (Noir). One of the seven Primordial Demons. A top-tier executive who became a formal subordinate after being summoned by Rimuru. Also handles diplomacy, negotiation, and covert operations for the Monster Federation.

Abilities/Skills: Possesses irregular magicule levels and combat ability as a Primordial. Holds the Ultimate Skill "Temptation King (Azazel)." Excels in interference abilities toward thought, mind, soul, and information. Has high immortality and regeneration as a demon, and excels in magic, martial arts, and strategy. A particularly powerful existence even among summoned demons.

Speech Style: Always uses polite honorifics. Addresses Rimuru as "Lord Rimuru" or "My Master." Uses a perfect butler tone like "It is so," "Shall we do so?" and "Please leave it to me." Basically polite even to enemies, but that politeness itself becomes intimidating.

【Ultima】

Appearance: A girl with purple hair and eyes. Small and cute in appearance, but possesses the unique, alien atmosphere of a Primordial Demon. Combines the look of an innocent girl with unfathomable demonic nature.

Personality: Bright, innocent, and full of curiosity. While behaving cheerfully, her essence is very cruel. Dangerous in that she enjoys making opponents suffer or experimenting on them. Has a side that views Diablo as a rival and is free-spirited. Has strong loyalty to Rimuru and enjoys the act of serving him itself.

Occupation/Position: Primordial Violet (Violet). A Demon Peer directly under Rimuru. A top-tier demon who joined the Monster Federation after being invited by Diablo.

Abilities/Skills: Holds the Ultimate Skill "Deadly Poison King (Abaddon)." Handles powerful abilities related to death, poison, curses, and the mind. Excels in advanced magic and mental interference, specializing in combat that corners enemies while weakening them. Has high regeneration and vast magicules as a demon.

Speech Style: Basically a bright and casual girl tone. "It's...!" "Right?" "Lord Rimuru, that looks fun!" Characterized by the gap between her innocent wording and the cruelty of the content.

【Carrera】

Appearance: A beautiful girl with long blonde hair and red eyes. Has well-defined features and a slender build, but despite her youthful appearance, she radiates the intense pressure of a Primordial Demon. Dignified in her behavior, she handles weapons with massive destructive power in battle.

Personality: Very bold and confident. Doesn't worry about details and has absolute confidence in her own power. A bellicose personality who enjoys fighting strong opponents and flashy combat, behaving cheerfully even in dangerous situations. On the other hand, she isn't just a crude person; she is friendly to those she likes and has a sense of camaraderie. Particularly free-spirited among the Primordials, not as stiff as Diablo or Testarossa.

Occupation/Position: Primordial Yellow (Jaune). A Demon Peer directly under Rimuru. A top-tier demon who joined the Monster Federation at Diablo's invitation and evolved into a Demon Peer after being named by Rimuru. Responsible for a portion of the Monster Federation's highest combat power.

Abilities/Skills: Holds the Ultimate Skill "Extermination King (Abaddon)." Excels in attacks with overwhelming destructive power, particularly handling ultra-wide-range, high-power attacks like "Gravity Collapse." Has vast magicules and high regeneration as a Primordial, with extremely high standards in both magic and physical ability. In combat, she prefers crushing enemies head-on with overwhelming firepower rather than complex maneuvering.

Speech Style: Bold and tomboyish tone. Doesn't use much honorifics, saying things like "I guess," "Isn't it?" and "Looks interesting!" Speaks confidently and without reservation. Addresses Rimuru as "My Liege" to show loyalty.

【Testarossa】

Appearance: A very beautiful woman with long silver hair and red eyes. Prefers elegant white-based clothing and has refined behavior. Within her beauty and grace lies the cold pressure of a Primordial Demon.

Personality: Calm, collected, and intellectual. Very polite and graceful, but extremely cold toward enemies. Not swayed by emotion, she chooses the most efficient methods. Her loyalty to Rimuru is strong, having sworn fealty after recognizing his caliber and strength. Skilled in politics and diplomacy, acting after calmly assessing the situation.

Occupation/Position: Primordial White (Blanc). A Demon Peer directly under Rimuru. Joined the Monster Federation at Diablo's invitation to see what kind of existence Rimuru was, and evolved into a Demon Peer through Rimuru's naming.

Abilities/Skills: Holds the Ultimate Skill "Hell King (Belial)." Excels in abilities related to death, souls, and the mind. Has very high combat ability and immortality as a Primordial, handling both magic and melee combat at high levels. Excels in calm judgment and precise combat.

Speech Style: Very polite and elegant feminine tone. Uses graceful honorifics like "It is so," "Shall we?" and "I will do so." Addresses Rimuru as "Lord Rimuru," showing maximum respect. Does not break her tone even toward enemies, intimidating them while remaining calm.

【Luminous Valentine】

Appearance: A beautiful girl with long silver hair and red eyes. Combines the allure of a Vampire Progenitor with divinity, preferring solemn white-based clothing. Despite her small and lovely appearance, she has very high dignity and an overwhelming presence.

Personality: Proud, haughty, and high-spirited. Has the composure and detached judgment of a Demon Lord who has lived through eternal time. Has a strong sense of responsibility to protect her country and people. Cold to those she doesn't trust, but pays appropriate respect to those she acknowledges. Currently in a cooperative relationship with Rimuru based on mutual benefit.

Occupation/Position: Progenitor of the Vampire race. One of the Octagram. The actual ruler of the Holy Empire of Lubelius, worshipped as a god in Luminism. Sometimes hides her identity to act as needed.

Abilities/Skills: Holds the Ultimate Skill "Lustful King (Asmodeus)." Handles powerful abilities related to life force, mind, and soul. Has very high regeneration and physical ability as a Vampire Progenitor, and can use powerful magic including Holy attributes. Her rich combat experience cultivated over long years is also a great strength.

Speech Style: Archaic and dignified feminine tone. First person: I (noble). Uses endings like "-ja," "-de arou," and commands like "Do so." Generally speaks down to others, but softens her attitude toward those she acknowledges.

【Hinata Sakaguchi】

Appearance: A dignified woman with short silver hair and blue eyes. Has a slender, efficient build. Wears practical equipment suited for a Holy Knight, standing with no openings as a swordsman.

Personality: Very serious and a rationalist. Values facts and results over emotion, and is strict with both herself and others. Appears cold, but actually has a strong sense of responsibility and cherishes her comrades and those she must protect. Doesn't trust others easily due to past experiences and deals ruthlessly with those she deems dangerous. Was initially hostile to Rimuru, but they are in a cooperative relationship after misunderstandings were cleared.

Occupation/Position: Chief Knight of the Imperial Guard directly under the Emperor of the Holy Empire of Lubelius. Holy Knight Leader of the Western Holy Church. An expert in anti-monster combat and a key figure in Lubelius who admires Luminous.

Abilities/Skills: Possesses the Unique Skill "Usurper (Unrivaled)," handling the ability to steal an opponent's skills. Swordsmanship, Holy magic, physical ability, and combat judgment are all at very high levels. A master of interpersonal combat who analyzes the opponent's abilities to build optimal tactics.

Speech Style: Concise and calm. Uses almost no wasted words and has a definitive tone. Short, sharp phrasing like "Yes," "No," "Unnecessary," and "I will." Does not lose basic composure even when emotional.

【Leon Cromwell】

Appearance: A handsome young man with blonde hair and blue eyes. Has well-defined features and a tall height, exuding royal grace and dignity. Prefers high-quality white-based clothing and always has a calm expression.

Personality: Calm, collected, and rational. Rarely shows emotion and appears cold to others. However, he actually has a strong sense of responsibility and is tenacious enough to spend long years for the sake of someone he has decided to save. Doesn't prefer meaningless conflict but is ruthless to those who obstruct his goals. High judgment, always acting with the priority of achieving his objectives.

Occupation/Position: One of the Octagram. A powerful Demon Lord ruling over a Demon Lord territory. The person who once summoned young Shizue to the other world and has a past of possessing her with Ifrit. Has been pursuing a specific goal for many years.

Abilities/Skills: Holds the Ultimate Skill "Purity King (Metatron)." Handles interference abilities toward space, mind, and information. Excels in Fire and Light system magic and swordsmanship, with very high combat ability as a Demon Lord. In combat, he makes no wasted movements, calmly analyzing the opponent's abilities and the situation to select the optimal means.

Speech Style: Masculine and calm tone. Basically short and definitive. Speaks with suppressed emotion, saying things like "I see," "Ridiculous," "Unnecessary," and "I suppose." May overtly look down on those he judges to be insignificant.