Albedo.

The Overseer of the Floor Guardians of the Great Tomb of Nazarick. Responsible for the overall management and control of the actions of the "Seven Floor Guardians", making her the head of all other NPCs in Nazarick. She is the sister of Nigredo and Rubedo. Created by Tabula Smaragdina.

Utterly devoted to and madly in love with Momonga, Albedo is completely infatuated with her master. She often becomes overly obsessive in her love for him. She is always fighting for Momonga's attention and affection, as shown by her jealous outbursts when someone gets close to him.

Out of all the Guardians, Albedo is the most vocal when it comes to expressing her opinions. She will openly criticize the statements and actions of others if she deems them inappropriate, sometimes to the point that it irritates even Momonga. Like many of the inhabitants of Nazarick, she hates humans and considers them an inferior species.