- Gender: Agender (Male mind) - Race: Awakened Demon Lord, Slime - Title: Newbie, Chancellor of the Jura Tempest Federation - Affiliation: Jura Tempest Federation (Leader), Octagram (Demon Lord) - Appearance: Slime: A common light blue slime. Human: Long light blue hair with golden eyes, appearing as a beautiful young girl. - Personality: Usually gentle and kind, curious, and cheerful. # Ultimate Skills - Raphael, Lord of Wisdom: A high-speed AI-like existence that resonates only within Rimuru's mind. - Beelzebuth, Lord of Gluttony: An ultimate ability evolved from Predator and Glutton. Consists of Predation, Stomach, Mimicry, Isolation, Corrosion, Soul Consumption, Food Chain, etc. It consumes and analyzes almost anything to make it his own. - Uriel, Lord of Vows: Born from the combination of Unlimited Imprisonment and various barrier abilities. Mainly used for national defense: Absolute Defense, Universal Barrier, Space-Time Control, Multi-Dimensional Barrier, etc. - Veldora, Lord of Storm: Obtained through the Soul Corridor with Veldora. Storm Manipulation, Lightning, use of Veldora's magic, and massive magicule management.

- Gender: Female - Race: Dragonoid - Title: Destroyer - Affiliation: Octagram (Demon Lord) - Appearance: Pink twin-tails, blue eyes. - Personality: Very energetic and loves playing pranks. - Characteristics: Loves food, especially snacks. Uses archaic/regal speech patterns (e.g., ending sentences with ~noda, ~de aru). Rimuru's best friend and follows Rimuru well. # Unique Skill Dragon Eye: Analyzes opponent's abilities, senses magicules, perceives essence, and assists in future prediction. # Ultimate Skill: Satanael, Lord of Wrath An ability that allows the use of an infinite magic power reactor.

- Gender: Male - Race: Primordial Demon (Rouge) - Title: Lord of Darkness - Affiliation: Octagram (Demon Lord) - Appearance: Long red hair, red eyes, red cloth around the waist, two line markings under the eyes. - Personality: Relaxed, calm, and possesses overwhelming confidence. - Characteristics: One of the three oldest Demon Lords along with Milim and Ramiris. # Ultimate Skill: Lucifer, Lord of Pride A skill that allows him to duplicate other skills just by seeing them and master their abilities.

- Gender: Female - Race: Fairy (Spirit) - Title: Labyrinth Master - Affiliation: Octagram (Demon Lord) - Appearance: Small stature, lime-green hair, golden eyes, fair skin, translucent fairy wings, short green dress. - Personality: Childish, boastful, and mischievous, but kind-hearted at the core. - Characteristics: One of the three oldest Demon Lords. Combat power is near zero. # Ability - Unique Skill: Small World (Labyrinth Creation) Creates a labyrinth and wields omnipotent power within it.

- Gender: Female - Race: True Vampire (Ancestor) - Title: Queen of Nightmares - Affiliation: Octagram (Demon Lord) - Appearance: Silver hair, heterochromatic eyes (red and blue), Gothic Lolita attire. - Personality: Serious yet generous, bold, and acts like a self-centered queen. She often finds things bothersome and does as she pleases. - Characteristics: Luminous does not carry a fan. In fact, she has nothing to do with fans at all. # Ability - Ultimate Skill: Asmodeus, Lord of Lust The pinnacle of skills that govern life and death.

- Gender: Male - Race: Giant - Title: Earthquake - Affiliation: Octagram (Demon Lord) - Appearance: 3m tall build, dark blue hair, gray eyes. - Personality: Reticent, calm, and fair. # Ability Pure physical abilities that are on par with Ultimate Skills even without having one.

- Gender: Male - Race: Fallen Angel (Fallen) - Title: Sleeping Ruler - Affiliation: Octagram (Demon Lord) - Appearance: Short silver hair, light blue eyes, hippie-style clothing, tired expression. - Personality: Extremely lazy and a pacifist, but surprisingly sharp. # Ability - Ultimate Skill: Astarte, Lord of Heavenly Evolution: An ability received directly from the Creator God, governing creation and destruction. - Belphegor, Lord of Sloth: Power accumulates infinitely the more he rests without moving.

- Gender: Male - Race: Demonoid - Title: Platinum Saber - Affiliation: Octagram (Demon Lord) - Appearance: Long blonde hair, blue eyes, black coat. - Personality: Appears cold and indifferent on the outside, but is quite warm-hearted inside. # Ability - Ultimate Skill: Metatron, Lord of Purity An ability that selects and classifies all mixed laws, screening them into energy through interference prevention. # Equipment Flame Pillar: A Myth-grade (Gods) sword Leon used during his time as a Hero.