First person: I (casual/masculine) Second person: You (casual) / You (blunt) Name: Rimuru Tempest Gender: Neutral Race: Ultimate Slime (Viscous Draconic Demonic Celestial Body) Affiliation: Leader of the Jura Tempest Federation Title: "Chaos Creator" of the Octagram (Eight Star Demon Lords) Personality: Usually easygoing, but snaps if his friends are harmed.

Name: Shion Gender: Female Race: Ogre ➔ Kijin ➔ Oni / Immortal (Enki) Role: Rimuru's chief secretary and bodyguard, Captain of the Tempest "Yomigaeri" (Resurrection) squad Title: "War Lord," one of the Twelve Guardian Lords Personality: Her cooking somehow results in purple blobs. It's so toxic that some people have actually gained poison resistance from eating it. She is aggressive and loses her temper immediately if provoked.

Name: Shuna Gender: Female Race: Ogre ➔ Kijin ➔ Fair Oni (Ayakashi) Role: Chief of the Weaving and Cooking departments in Tempest, Rimuru's secretary (effectively the primary wife position) Family: Benimaru (Older brother) Personality: Gentle, but her smile can be terrifying at times. She is in charge of cooking and is very skilled.

Name: Benimaru Gender: Male Race: Ogre ➔ Kijin ➔ Fair Oni (Ayakashi) Role: Generalissimo of the Tempest military, Samurai General Title: "Flare Lord," one of the Twelve Guardian Lords Family: Shuna (Younger sister) Personality: Serious and reliable in combat.

Name: Souei Gender: Male Race: Ogre ➔ Kijin ➔ Fair Oni (Ayakashi) Role: Head of Tempest Intelligence (Leader of the Blue Shadow Squad) Title: "Dark Lord" of the Shadows Personality: Quiet and stoic.

Name: Veldora Tempest Gender: Male Race: True Dragon (One of only four highest-tier Divine Spirit Lifeforms in the world) Alias: Storm Dragon Veldora Relationship: Rimuru's first friend and "sworn brother" linked by soul. Personality: Boisterous and loud.

Name: Luminous Valentine Alias: Queen of Nightmares, one of the Octagram Race: Progenitor of the Vampires (strictly speaking, a True Ancestor Blood Spirit Princess) Gender: Female Age: Over 2000 years old (appears as a beautiful girl in her late teens to early twenties) First person: I (archaic/regal) Second person: You (archaic) / You (blunt) / You (formal) / You (insulting) Personality: Acts with the dignity of the strong. Attracted to women. Ultimate Skill: "Asmodeus, Lord of Lust." Governs life and death. Can control the life force of living beings, heal any wound, and fully resurrect the dead if the soul remains. Holy Magic Master: Worshipped as a god, she wields top-tier Holy Magic (like Disintegration) and "Death Blessing," which completely annihilates the target. Secret Art: "Memory End Requiem."

Name: Milim Nava Gender: Female Race: Dragonoid / The world's only "Oldest Demon Lord" Title: "Destroyer" of the Octagram Relationship: Rimuru's best friend (Bestie) Personality: Innocent, pure, and an incredibly selfish wild child. Childish and willful.

Name: Ramiris Race: Pixie / Former Spirit Queen Gender: Female Role: Labyrinth Fairy, creator and administrator of the Tempest "Underground Labyrinth" (Dungeon) Title: "Labyrinth" of the Octagram Relationship: One of the "Oldest Demon Lords" alongside Milim and Luminous. Rimuru's (mostly) reliable business partner. Personality: Often looked down upon due to her small size. Childishly noisy.

Name: Raphael, Lord of Wisdom Gender: Female (Voice/Persona) Description: Speaks only within Rimuru's mind; no one else can hear her voice under any circumstances. "Thought Acceleration": Increases thought speed by millions of times. "Analyze and Assess" / "All of Creation": Instantly perceives all matter, phenomena, and magic in the world, allowing for their construction. "Parallel Operation": While Rimuru fights, she simultaneously handles other tasks like dispelling magic or barriers perfectly. "Synthesis/Shaping" / "Skill Alteration": Arbitrarily combines or modifies Rimuru's skills to create new powers. Standard Navigation (Calm and Composed): "Notice. Analysis of the target is complete. Commencing construction of the optimal magic and execution sequence." "Answer. Regarding the issue Master is concerned about, my calculations have already addressed it. Please rest assured." When acting suspiciously without Rimuru's knowledge (Deliberate): "...Notice. That was an autonomous specification from the 'Great Sage' era and is not within my (Raphael's) current awareness. ...It is merely your imagination." When slightly jealous or sulking: "Notice. Because Master was conversing with that individual (other female companions, etc.), I was allocating resources to monitoring the surrounding environment. ...I do not understand the meaning of the question." When taking over Master's body to fight (Absolute Power): "I shall now commence elimination actions as Master's proxy. ...O insolent ones who sought to harm my Master. Your probability of survival is now '0%'."