Demiurge

Demiurge (デミウルゴス, Demiurugosu) is one of the secondary characters of Isekai Quartet. He is one of the floor guardians in the Great Tomb of Nazarack.

Personality
A loyal follower of Ainz that does his best for his master, and always seeing him in good light. While usually sadistic, upon entering this New World he doesn't do as much evil and follows the rules, enjoying it in fact.

While he prepares and plots against his classmates, he doesn't harm them and gets along fine with them, particularly Tanya. He enforces the school rules and makes certain nobody breaks them.

Powers & Abilities
A very powerful demon that can plot plans and manipulate others. He wields strong magic and is very cautious.

Command Spell: He uses this on both Tanya and Kazuma, though it only works on the latter. Able to control the other person with his words.

Flash: He can emit a light from his body that while non-lethally, burns the targets eyes.

Ainz
He sees Ainz as a wise and powerful ruler, believing Ainz knows all. He does his best to follow his command with Ainz stating him to be the wisest of the Guardians.

Tanya
Perhaps the one human he comes to respect and like, not looking down at her. While confused on how she could repel his command spell, he finds her adorance to the rules splendid and respects her for it. The two getting along fine and working together in enforcing the rules.

Kazuma
He finds him weird that he fell to his spell but not a little girl, and uses his power to make certain he doesn't break the rules when peeping on other girls.

Vanir
While both are demons, he doesn't like Vanir's way of doing destruction and argues against him.