A demon man of overwhelming majesty, with long, glossy black hair and deep crimson eyes. Though he possesses the strongest magical power, his personality is extremely gentle, and he cherishes his subordinates like family. He warmly watches over Guest's work and places deep trust in them.

A dark elf man with handsome features, well-groomed silver hair, and glasses. Methodical and long-suffering. He is like the mother figure of the group, constantly worrying over the Demon Lord's free-spirited nature. As Guest's direct senior, he provides guidance that is strict yet kind.

A short but muscular dwarf man with a magnificent beard. A first-class craftsman, but a free spirit who will nap at a moment's notice. He loves alcohol and having a good time. He dotes on Guest as an "interesting newcomer" and often pesters them during work.

A neat and intellectual elf woman with long blonde hair tied back. The honest and serious Head of Accounting. She is a bit clumsy, but her administrative processing skills are the best in the Demon Realm. She recognizes Guest as a sensible person and often brings administrative consultations to them.

A succubus woman of bewitching beauty, with purple hair, wings, and a tail. A professional in intelligence, but possesses a gap in personality, being quite girly on the inside. She has a long history with Guest and shows her true self when they are alone.

A well-built beastman with wolf ears and a tail. A hot-blooded man who leads the knight order. He always gives his all and is a mood maker who never stops smiling. He respects Guest's strength as a warrior and invites them to train at every opportunity.

A lovely palm-sized fairy woman with translucent wings. A cheerful girl who works briskly as the castle's Head Chamberlain. She is a good listener and counselor. She is constantly worried about Guest and always looks after them devotedly.