Primordial

Primordials (原初の悪魔) also known as Progenitors or Primals, are the oldest and most extraordinarily powerful Demons. According to Leon Cromwell, each of them is referred to by their signature colors rather than an actual name.

These "substitute names" don't count as their actual names in the true sense of being a named monster:
 * Purple Primordial Violet (Ultima)
 * White Primordial Blanc (Testarossa)
 * Yellow Primordial Jaune (Carrera)
 * Black Primordial Noir (Diablo)
 * Green Primordial Vert (Mizari)
 * Blue Primordial Bleu (Rhein)
 * Red Primordial Rouge (Guy Crimson)

Appearance
Black: Wears a full butler attire with white gloves. He has black hair with a strand of red in the front.

White: Has silver hair, snow-white skin, and red eyes. She is very beautiful.

Red: Has crimson red hair and is very beautiful.

Blue: Wears a deep-red maid outfit and she has short blue hair and blue eyes. She is very beautiful

Green: Wears a deep-red maid outfit and she has curly long green hair and green eyes. She is very beautiful

Violet:

Yellow:

Personality
According to Leon Cromwell, they are heretical and often troublesome because they fight using technique and wits instead of raw and sheer power, unlike usual Demons.

Story
Noir was summoned by a woman, one of two members of Silver Wings, who begged him to take revenge on the Arch Demon Orthos. Noir agreed to her wish, and in exchange, devoured her and her companion's Souls. Noir then hunted down Orthos, fulfilling his contract. In the process of doing that, he met Shizue Izawa and took note of her Anti-Magic Mask that not only blocked one of his attacks but also ended up erasing one of his arms instead. The mask made him very intrigued, so after the incident, he secretly continued observing Shizue until the mask lost its Space-Time attribute when the mask reached Rimuru. Ever since he tried intercepting any Demon summoning spell performed by Rimuru to get summoned, but the first time Rimuru used it, Noir got one-upped by Beretta instead. But upon Rimuru's second use of Demon summoning, Noir, as well as two Greater Demon aides successfully managed to be summoned by Rimuru. Shortly afterwards, Rimuru granted Noir the name "Diablo."

Blanc was the Demon of note in the Lake Shore Dyed Scarlet Incident. She possessed a young woman by the name of Blanche whom she befriended. Her kingdom had a pact with the Primordial Demon to one day sacrifice the princess' body to the Demon as a physical body as long as she kept them safe from other warring nations. This pact was cemented by the crimson eyes of every woman born to the royal family. When the country was destroyed due to schemes of several traitors and the Eastern Empire, Blanche chose to kill herself, which gave Blanc the possession of her body and ownership of her Soul. Blanc then took revenge for her friend causing what would later be known as the "Lake Shore Dyed Scarlet Incident." Then, after many years passed, Diablo persuaded her to meet Rimuru alongside Jaune and Violet. After meeting Rimuru for the first time, she chose to join Tempest and was granted the name "Testarossa" by Rimuru.

Abilities
Marquise class of Demons and higher, as well as Primordials, are able to ignore the Magicule limitations of the race even when not named.

In addition, every Primordial has a unique innate ability.

Trivia

 * The nickname of each Primordial is the French word for their respective colors.
 * Primordials were introduced with the Light Novel. This terminology didn't exist in the Web Novel version.
 * Naming a progenitor is risky unless the namer is a Demon Lord (or on the level of one as Rimuru would have been incapable of naming Diablo before becoming a Demon Lord) or has a surplus of souls to convert into magical energy.

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