Sanzenin, Mikado

三千院帝

Mikado Sanzen'in is Nagi's grandfather and the head of the Sanzen'in family. He resides in a mansion significantly larger than Nagi's, attended by numerous servants who all look identical. The origin of the Sanzen'in fortune remains unknown, though Nagi refers to her grandfather as an oil tycoon. He possesses the ability to judge a person's character merely by looking at them.
Although Mikado is Nagi's only direct relative, they do not get along. Nagi dreads visiting him at the main house. Consequently, Mikado is not seen after his initial appearance. However, it is evident that he worries for her, as he attempts to thwart assassination and kidnapping plots. He redirects these efforts toward Hayate by announcing that he will pass the Sanzen'in inheritance to whoever makes Nagi cry and beg for forgiveness. He later changes this condition, with the help of Maria, whom he is fond of, to first get rid of the butler.