Demiurge

The Guardian of the Seventh floor of Nazarick, with the form of a demon wearing glasses.

About Demiurge

Demiurge is very intelligent, but is also considered the most evil NPC on Nazarick. He greatly enjoys the suffering of others, made clear by his vicious experiments on prisoners. He's in charge of tactics and defenses of Nazarick. Among the Guardians, he gets along the best with Mare, since he understands the more cunning side of the Dark Elf.

Role in Overlord

Demiurge appears in Overlord as a supporting character.

Bio summary adapted from AniList.