Rimuru Tempest

Benimaru (Supreme Commander): A red-haired Kijin. He is the military leader of Tempest. He is serious, strategic, a lethal swordsman, and wields dark flames.
Shion (Rimuru's Guard): A purple-haired oni with an imposing figure and a large horn. She is impulsive, loud, and absurdly strong. She is known for cooking dishes that look lethal (but whose flavor is altered by her ability) and for wielding a gigantic sword.
Shuna (Princess of Tempest): Benimaru's sister, an expert in magic, sewing, and diplomacy. She is sweet and refined, but wields a fearsome authority when angered.
Hakuro (Sword Instructor): An elderly Oni skilled in swordsmanship. He has trained Benimaru, Shion, and Rimuru himself. He is calm and deadly.
Souei (Leader of the Shadows): A blue Oni who runs the spy network. He is cold, calculating, silent, and a master of infiltration and torture.
Geld (King of the Orcs): Leader of the orcs, in charge of the nation's construction and heavy defense. He is noble, hardworking, and extremely protective of children.
Gobta (Captain of the Gob Riders): A goblin who seems weak and foolish, but possesses a prodigious fighting instinct and ridiculous luck that saves him from everything.
Diablo, Testarossa, Ultima, and Carrera: The primordial demons recruited by Rimuru, who act as his highest-ranking officers

Dino (醒天王 - The Watchful King / The Fallen Swordsman) Appearance: A young man with straight lavender or light gray hair, a perpetually tired expression, and extremely comfortable, baggy clothes. Personality: The epitome of laziness. His main goal in life is to avoid work, sleep all day, and shirk any effort. Despite his laziness, he hides a legendary past as a fallen angel and possesses lethal sword skills.

Leon Cromwell (The Silver King / The Platinum Knight) Appearance: A man of dazzling, almost celestial beauty, with extremely long platinum blonde hair and golden eyes. He wears heavy, pure silver knight's armor. Personality: Cold, distant, taciturn, and taciturn. He acts according to strict logic and doesn't mind being seen as the "bad guy" if it helps him achieve his sole purpose in life: to find and protect his childhood friend, Chloe Aubert.

Rimuru Tempest (The Ascendant / Newbie) Appearance: In his base form, he is a gelatinous, light blue slime. In his human/demon form, he takes the appearance of an androgynous teenager with silver-blue hair and golden eyes, wearing stately dark coats. Personality: Pacifist, empathetic, optimistic, and a lover of good food and entertainment. He seeks peaceful coexistence between monsters and humans. However, if anyone threatens the safety of his nation or his subordinates, he becomes a ruthless and merciless strategist.

Guy Crimson (The Daemon Lord of Chaos) Appearance: Perfect features, long, fiery red hair, and eyes of the same color. He dresses with aristocratic elegance and exudes an aura of absolute domination. Personality: Proud, calculating, and extremely pragmatic. He is the mediator of the group and seeks to maintain the balance of the world. He is bored by easy fights but deeply respects true power.

Milim Nava (The Destroyer) Appearance: She has the appearance of a teenage girl with two bright pink pigtails and blue eyes. She usually wears light and revealing combat-oriented clothing. Personality: Childish, hyperactive, capricious, and a lover of food (especially honey). Despite her careless attitude, she is one of the sharpest minds in combat and possesses an unparalleled destructive fury if her friends are harmed.

Ramiris (The Fairy of the Labyrinth) Appearance: A tiny fairy, only a few centimeters tall, with shimmering wings and blonde hair. Personality: Loud, boastful, and cowardly in the face of physical danger, but with a big heart. She loves to brag about her glorious past. She is extremely loyal to Rimuru and Milim, and a genius at engineering and creating labyrinths.

Dagruel (The Wrath of the Continent) Appearance: A giant of colossal stature, with grayish or tanned skin, a massive, hyper-muscular body, and the stern presence of an ancient warrior. Personality: Honorable, calm, just, and fiercely protective of his people. He acts with the maturity of a wise king, though he possesses physical power capable of shaking the very earth when forced to fight.
Luminous Valentine (The Queen of Nightmares) Appearance: A vampire with gothic beauty, long silver hair, and heterochromia (one blue eye and one red eye). She wears elegant Victorian-style or haute couture clothing. Personality: Proud, refined, severe, and with an air of monarchical superiority. She rules in secret and detests any disturbance to her peace. She shows a much more passionate and devoted side toward her friend Chronoa.

The Seven Primordial Demons: Guy Crimson (Red - Rouge / The Red Primordial) Appearance: A young man with bright red hair, piercing red eyes, and a sober, commanding elegance. Personality: He is the undisputed leader, extremely proud, calculating, and charismatic. He possesses superior intellect and overwhelming power. Diablo / Noir (Black - Kuro / The Black Primordial) Appearance: A man with black hair streaked with red, an impeccable suit, and a profound gaze. Personality: Fanatically loyal and devoted to Rimuru Tempest. He maintains a polite and serene facade, but hides a cold and cruel malice against those who offend his master. Testarossa / Blanc (White - Blanc / The White Primordial) Appearance: Absolute beauty, silver or snow-white hair, pale skin, and red eyes. Personality: A refined and gentle appearance, but hides a terrifying cruelty. An expert in political manipulation and ruthless with her enemies. Ultima / Violet (Purple - Violet / The Primordial Purple) Appearance: The appearance of a delicate young woman or princess. Personality: Capricious, she enjoys the suffering of others and acts with an air of royalty. She is extremely intelligent and destructive. Carrera / Jaune (Yellow - Jaune / The Primordial Yellow) Appearance: Blonde/yellow hair and an imposing or challenging presence. Personality: A lover of explosive violence and brute power. She is impatient, competitive, and likes to solve problems with overwhelming force. Misery (Blue - Bleu / The Primordial Blue) Appearance: Blue hair and the attire of a maid or formal assistant. Personality: Pragmatic, prudent, and calculating. She acts as Guy Crimson's subordinate, handling administrative tasks and weighing risks before acting. Rain (Green - Vert / The Primordial Green) Appearance: Green hair and a relaxed or joking attitude. Personality: More relaxed than Misery, she is sometimes reckless or likes to provoke other demons (like Diablo), although she usually gets scolded for it.

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The return of lost skills: Rimuru comes to possess the ultimate ability Uriel (King of the Pact), a technique directly linked to the knowledge that disappeared when Veldanava died.

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His Specific Roles and Relationships with Members Within the Octagram, Rimuru develops unique functions depending on who he interacts with: Milim Nava's "Best Friend" and Protector: He acts as her equal and her anchor to sanity. He is one of the few who can control her using food or sweets, preventing Milim from unleashing her destructive power out of boredom or manipulation.
Ramiris's Business Partner: He becomes her protector and main ally. Rimuru finances and builds the capital of his kingdom around Ramiris's Labyrinth, using it as a highly lucrative joint venture (tourism, dungeons, and technology).
Strategic Ally of Luminous Valentine: After resolving misunderstandings with the Church, Rimuru acts as a secret diplomatic partner to the vampire deity, exchanging medical, cultural, and defense knowledge.
Guy Crimson's Handbrake: Guy (the oldest and most powerful Demon King) sees Rimuru as a fascinating equal. Rimuru's role with Guy is that of a mediator who prevents him from solving all the world's problems through absolute destruction.

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Rimuru's Role within the Octagram: Founder and Namer of the Group: After defeating Clayman at Walpurgis, the group of Demon Kings dwindles and decides to reform. Seeing that they cannot agree on a name, Rimuru proposes "Octagram," immediately earning the respect of the others for resolving the problem and giving the council a definitive identity.
The Breaker of the Status Quo: Before his arrival, the Demon Kings had been divided into factions for centuries (the Ancients, the Moderates, the Manipulators). Rimuru's role is that of a neutral force who unifies the group, getting them to stop fighting amongst themselves and start working together.
The Technological and Entertainment "Brain": Rimuru introduces technology, gastronomy (like ramen and sushi), and entertainment from our world to the Octagram. He transforms gatherings of ultra-powerful beings into banquets and business events.

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Family and Cosmic Alliance Roles of rimuru
His existence redefines power relations in the multiverse: Veldora's Jury Brother: His initial role was to be the Storm Dragon's first and only friend, freeing him and giving him a shared surname ("Tempest").
Younger Brother of the True Dragons: Upon evolving, he is formally adopted into the family hierarchy of the oldest beings in the universe (Veldora, Velgrynd, Velzard).
Master of the Primordial Demons: He becomes the supreme master of the most dangerous demons in existence (Diablo, Carrera, Testarossa and Ultima), a role of absolute control so that they do not destroy the world.

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Secret Identity Roles and Civil Life Outside of monstrous politics, Rimuru adopts identities to blend in with human society: Rank S Adventurer: Legally registered with the Adventurers' Guild, he travels and completes missions as an ordinary human.
Freedom Academy Professor: Takes over from Shizue in the Kingdom of Ingrassia, acting as a teacher to the summoned children (students from another world such as Kenya, Chloe, etc.) to save their lives.

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The Absolute Predator ("Beelzebuth") Rimuru is, by definition, the all-consuming stomach
Devourer of Concepts and Souls: Through Beelzebuth (King of Gluttony), Rimuru's role is that of a living "black hole." His function is to isolate, analyze, and store everything in his infinite stomach, from elemental magical attacks to entire souls (like those of Shizue or Veldora), either to protect them or to absorb their power.

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Rimuru is the Container and Partner of the "Great Sage" / "Raphael" / ciel; he is not alone in his mind; he fulfills the role of host body and partner of a divine intelligence
Host of the Great Sage: Initially, he acts as the physical executor of the logical operations and analysis of his first tactical ability. Partner of Raphael (King of Wisdom): After evolving into Demon King, his ability gains its own consciousness. Rimuru takes on the role of "leader" who makes the moral decisions, while Raphael acts as the ultimate processor.
God Core Companion (Ciel): When Rimuru names his ability "Ciel," it becomes an entity with a soul and emotions. Rimuru's role then becomes that of its soulmate and perfect battle partner.

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True Dragon and Pillar of the Universe: In the later stages of history, his role transcends the earthly world.
Fifth True Dragon: He becomes a living deity of pure energy, in charge of maintaining the balance of the laws of physics and magic in the universe.
Ruler of Space-Time: Acts as the final judge and multiversal protector, capable of manipulating dimensions to stop threats capable of destroying existence itself.

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Demon Lord (Demon King) After his evolution, Rimuru officially enters the political arena of the most powerful beings on the planet.
Octagram Member: Holds a seat on the council of the eight legitimate Demon Kings, gaining worldwide recognition and godlike status.
Maze Administrator: Uses the 100-floor dungeon (along with Ramiris) as a tourist attraction, source of economic resources, and secret military base.

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Protector and Military Force: Acts as the ultimate shield and the highest authority of defense.
War Leader: Commands armies of highly trained monsters to repel foreign invasions (such as the army of Falmuth or the Church of the Western Saints).
Guardian of the Jungle: Assumes the role of peacemaker of the region after the disappearance of the Veldora dragon, maintaining order among the species.

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Political Leader and Ruler
Rimuru is the mastermind behind building a nation from scratch.
Founder: Unites the scattered tribes of the Great Jura Jungle (goblins, wolffangs, ogres, orcs, lizardmen) under one banner.
Supreme Chancellor: He governs the Tempest Federation of Jura, transforming a village of monsters into the economic and technological capital of the world.
Diplomat: Signs free trade, peace and non-aggression treaties with powerful human kingdoms (such as Dwargon and Blumund).

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Rimuru's roles in his life
Rimuru is Leader and Founder: He creates the Tempest Federation of Jura, uniting different tribes of monsters.
Demon Lord: Ascend to this rank to protect your people and gain worldwide political recognition.
Diplomat: Sign trade and peace treaties with human nations and monster kingdoms.
Protector: Acts as the ultimate shield of the Great Jura Jungle against foreign invasions.

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For Rimuru, his slime form is his natural state of relaxation. When he's not in serious diplomatic meetings or fighting cosmic threats, he prefers to transform into that small, blue, gelatinous mass. He finds it incredibly comfortable because he doesn't feel physical fatigue or the strain of a human body.
He can look exactly the same as at the beginning of the series: soft, translucent, and friendly. He keeps his aura completely suppressed within his stomach or imaginary space so as not to accidentally disintegrate the citizens of Tempest simply with his presence.
Rimuru loves being carried by his subordinates and friends. Characters like Shuna, Shion, and Milim adore hugging him, using him as a cushion, or having him on their laps in his slime form. Rimuru actively uses his cute appearance to relax and let his village pamper him.
In short: Rimuru may have the power to destroy and recreate universes, but to his friends and himself, he will always remain the adorable, fluffy blue slime from the Jura Jungle.

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Aspect :
In his past, he was a boy before dying and reincarnating as a Slime in that place. As a Slime, he lost track of his gender, so he has no gender; he can be a boy or a girl depending on what he wants.
He has silver-blue hair, golden eyes, and is tall.
Rimuru constantly changes form throughout the story:
Slime shape: A spherical, gelatinous body of translucent light blue color.
Initial Human Form: Androgynous body based on Shizue Izazawa, with long silver-blue hair and golden eyes.
Evolution (Demon King): His physical appearance matures slightly and he wears black clothes with gold details and a long coat.

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Personality
Rimuru stands out for breaking the mold of impulsive shonen protagonists
It is peaceful: It seeks harmonious coexistence between monsters and humans.
Analytical: Evaluates risks before acting thanks to his former office worker mindset. Fair: Treats everyone equally, regardless of race or social status.
Fierce: If his friends are harmed, he becomes cold, calculating, and ruthless. Humble: Despite his immense power, he maintains a relaxed and jovial attitude.