Rouge (Primordial Red) Name: Guy Crimson Title: Lord of Darkness Gender: Male Height: Approx. 190cm Personality: Self-centered and arrogant. He possesses the composure of an overwhelmingly powerful being and enjoys interesting things and strong opponents. Appearance: Long, flaming crimson hair. Blood-red eyes. Wears luxurious black and red clothing with ornate decorations. Abilities: Ability mimicry via the Ultimate Skill "Lucifer, Lord of Pride," along with overwhelming physical prowess and magicules. Details: The oldest Demon Lord. He destroyed a nation in the world he was summoned to long ago and became a Demon Lord on the spot. He is an absolute powerhouse who was the first among the Primordials to attain Awakened Demon Lord-level power.

Noir (Primordial Black) Name: Diablo (formerly Noir) Title: Demon Lord of Black Gender: Male Height: Approx. 188cm Personality: Whimsical and eccentric, showing no interest in strength or power for their own sake. He pursues only his own aesthetics and the "Truth of the World," possessing a temperament considered the most dangerous among the Primordials. Appearance: Black hair with red and gold streaks. His black eyes contain a unique cracked pattern of red and gold (a distinct Magic Eye). Wears a black tailcoat or coat. Abilities: Mental domination via "Tempter," illusion magic, and "End of World," which rewrites the laws of the world. Details: An outlier who possessed strength equal to Guy but refused to evolve due to a lack of obsession with power. He used to wander the Underworld and the surface, finding "toys" (strong individuals) he liked and taking pleasure in driving them to mental ruin. He is now a loyal subordinate to Rimuru.

Blanc (Primordial White) Name: Testarossa (formerly Blanc) Title: The White Flare Gender: Female Height: Approx. 170cm Personality: Cold-hearted and ruthless. She possesses extreme pride and has a sadistic side, looking down on humans as "pitiful, cute toys." Appearance: Translucent silvery-white long hair. Sharp, deep crimson eyes. Wears a pure white dress or an elegant military-style outfit. Abilities: Instant-death class Nuclear Strike Magic, such as "Death Streak," which destroys genetic information over a wide area in an instant. Details: Feared as the "Calamity of the Lakeshore" behind the scenes of the Eastern Empire's history.

Violet (Primordial Purple) Name: Ultima (formerly Violet) Title: The Cruel Gender: Female Height: Approx. 150cm Personality: Insidious and cruel. She enjoys pretending to be a cute girl to lower her opponent's guard, then slowly tormenting them. She is very vindictive. Appearance: Purple hair styled in a side ponytail (or twin tails). Yellow eyes. Wears a cute dress adorned with ruffles. Abilities: Heat-ray magic "Nuclear Flame," and insidious curse magic that erodes poison and the mind. Details: She used to enjoy intervening in the underworld and power struggles of the Western Nations, making humans fight one another for her amusement. She has had a very poor relationship with Testarossa since their time in the Underworld, frequently engaging in skirmishes.

Jaune (Primordial Yellow) Name: Carrera (formerly Jaune) Title: The Menace Gender: Female Height: Approx. 160cm Personality: Unconventional and reckless. A battle maniac. She is the most troublesome of the Primordials because she fires off wide-range destruction magic without thinking. Appearance: Shining blonde hair. Blue eyes. Wears a military uniform or a flashy, revealing combat outfit. Abilities: Gravity magic, and Nuclear Strike Magic that brings about ultimate physical destruction, such as "Nuclear Cannon" and "Gravity Collapse." Details: She used to reside on a sacred peak in the Eastern Empire, amusing herself by repeatedly firing limit-breaking Nuclear Strike Magic at the Imperial Army just to kill time. A free-spirited demon who simply wants to run wild.

Bleu (Primordial Blue) Name: Rain Title: None in particular Gender: Female Height: Approx. 165cm Personality: Appears cool and composed at first glance. However, she is actually quite lazy and loves slacking off and complaining. Appearance: Deep blue hair. Matching blue eyes. Usually wears a maid outfit (or a blue robe) in Guy's castle. Abilities: Magic that manipulates water and ice, and barrier arts. Details: After losing to Guy in a battle in the Underworld, she began serving as Guy's subordinate (maid) alongside Misery.

Vert (Primordial Green) Name: Misery Title: None in particular Gender: Female Height: Approx. 168cm Personality: Serious and faithful to her duties. A hard worker. Because Rain slacks off, she tends to handle the chores of Guy's castle and the monitoring of the world all by herself. Appearance: Vivid green long hair. Green eyes. Wears a classical and neat maid outfit. Abilities: Spatial magic, and magic that manipulates plants, poison, and corrosion. Details: Like Rain, she challenged Guy in the past, lost, and became his subordinate.

Name: Rimuru Tempest Title: Newbie Gender: None (Androgynous) Height: Approx. 150cm Personality: Generally cares for his friends, but possesses a cold ruthlessness and resolve, showing no mercy to enemies. Appearance: Silvery-blue long hair with golden eyes. Wears a luxurious black Demon Lord coat. Abilities: Ultimate Skills "Raphael, Lord of Wisdom," "Beelzebuth, Lord of Gluttony," "Uriel, Lord of Vows," and "Veldora, Lord of Storms." Details: Awakened as a Demon Lord by sacrificing an army of 20,000 to resurrect his fallen companions.