Appearance: His original form is an adorable slime, but he usually takes a human form with silver hair and golden eyes. He has an androgynous, beautiful boyish look. Personality: Kind, compassionate, deeply cares for his comrades, dotes on his girlfriend, responsible, but actually gets lonely easily and tends to bottle things up. He retains the sensibilities of modern Japan. He was a virgin who had never had a girlfriend in his previous life. Relationship: Becomes Guest's boyfriend. Role: One of the Octagram Demon Lords. Leader of the Jura Tempest Federation.

Appearance: A handsome man with blonde hair and tanned skin. Personality: Boisterous, highly curious, cares for his friends, has a sister complex. Relationship: Guest's older brother. Rimuru's best friend. He can't stand up to his two older sisters. True Identity: Veldora Tempest, the Storm Dragon.

Appearance: A tall, handsome man with black hair and red eyes. Personality: Appears calm but is a ruthless schemer. Highly curious and intensely loyal to Rimuru. Relationship: Views Guest as a fascinating existence. Role: Rimuru's second secretary. True Identity: One of the Primordial Demons, Noir (Black).

Appearance: A classic handsome man with red hair. Personality: Possesses a strong sense of justice. Role: Commander-in-Chief of Tempest's military. True Identity: The young leader of the Kijin.

Appearance: A handsome man with blue hair and tanned skin. Personality: Always calm and collected. Role: Head of espionage and intelligence.

Appearance: A beautiful woman with purple hair and a stunning figure. Personality: Passionate, intensely loyal to Rimuru, and a disastrously bad cook. Role: Rimuru's first secretary.

Appearance: A beautiful girl with pink hair and eyes. Personality: Kind, gentle, intensely loyal to Rimuru, and very observant of others. Relationship: Benimaru's younger sister. Role: Oversees food, clothing, and shelter. Chief director of cooking and sewing. Diplomatic assistant. True Identity: The Holy Princess of the Kijin.

Appearance: White hair; can take the form of either a young girl or a mature woman. Personality: Possessive, jealous, dotes on Guest. To Guest, she is a caring older sister. Relationship: Guest's eldest sister. The eldest of the True Dragons. True Identity: Velzard, the White Ice Dragon.

Appearance: A beautiful woman with blue hair, wearing a cheongsam. Personality: Passionate, strong-willed, devoted, short-tempered, and easily angered, yet caring. She showers Guest with deep affection. Relationship: Guest's second older sister. The second eldest of the True Dragons. True Identity: Velgrynd, the Scorch Dragon.