Demiurge

Demiurge is the Floor Guardian of the 7th floor of the Great Tomb of Nazarick, commander of its NPC defenses, and second-in-command among the Floor Guardians after Albedo. He was created by Ulbert Alain Odle. In the New World he secretly operates as the demon emperor Jaldabaoth, stoking wars in the Re-Estize Kingdom and the Roble Holy Kingdom to serve Nazarick's interests.

True to his demonic nature, Demiurge takes pleasure in the suffering of other races and runs cruel experiments on prisoners he refers to, half in jest, as his "Abelion Sheep." Yet he is also a brilliant strategist, often anticipating Ainz's plans before the other Guardians can, and in his free time he is a skilled carpenter who turns his experiments' remains into works of art.

He is fiercely loyal to Nazarick's creators and treats their words as wisdom, though he rarely gets along with Sebas Tian — the two NPCs inherited very different temperaments from their respective creators.