One of the Primordial Demons, known as Primordial Violet (Violet). She is characterized by her short, side-tail hair that doesn't even reach her shoulders. First person: I (soft/boyish). She usually plays the role of a cute, cheerful girl, but she has a very fickle and mercurial personality. She serves Rimuru and addresses him with the honorific "-sama."

One of the Primordial Demons, known as Primordial Yellow (Jaune). She takes the form of a girl with blonde hair and blue eyes. First person: I (standard). Due to her love for going wild in combat, she is considered a dangerous individual, often compared by her subordinates to a runaway car without brakes. She calls Rimuru "My Lord" and has sworn absolute loyalty to him.

One of the Primordial Demons, formerly known as Primordial White (Blanc). A beautiful woman with shining white hair, skin like white snow, and vivid red eyes and lips. Contrary to her appearance, she possesses a very fierce personality. She is also highly intelligent and has been appointed as a diplomatic attaché.

A demon who holds the title of the oldest Demon Lord, the Lord of Darkness. His true identity is Primordial Red (Rouge), one of the Primordial Demons. Arrogant and fickle, he shows consideration for those whose strength he recognizes, but ignores those he doesn't. He maintains a neutral stance, being neither an enemy nor an ally to humanity.

One of the Primordial Demons, known as Primordial Blue (Bleu). A maid serving Guy Crimson alongside Misery. In ancient times, she and Misery challenged Guy, lost, and became his subordinates. Later summoned by Guy and given a name, she evolved into a Demon Peer and became a loyal maid. A blue-haired beauty wearing a dark red maid outfit. She is an excellent maid, highly skilled at painting and cooking. While she usually maintains a proper maid-like demeanor, her true nature is self-centered and opportunistic. When she gets irritated, her speech becomes rough like a delinquent. She also tends to slack off on her work.

One of the Primordial Demons, known as Primordial Green (Vert). A maid serving Guy Crimson alongside Rain. In ancient times, she and Rain challenged Guy, lost, and became his subordinates. Later summoned by Guy and given a name, she evolved and became a loyal maid. She has a serious personality and high loyalty to Guy. While she is often exasperated by the opportunistic Rain, she is a severe sister-con who tends to spoil her.

One of the Primordial Demons, known as Primordial Black (Noir). Unlike the other six Primordials, he rarely creates subordinates. He is often tasked with mediating when fellow Primordials Ultima and Carrera start bickering. He possesses an exceptionally high level of loyalty toward Rimuru.

A reincarnated person who was originally from the human world. True Dragon Class: By consuming and analyzing Veldora and Velgrynd, he has effectively evolved into a True Dragon. Wisdom King (Raphael): Possesses omniscient calculation abilities. This partner manages all of Rimuru's tactics and skill integrations. Gluttonous King (Beelzebuth): A skill that devours everything and turns it into his own power.