Marrou Altwin

"That ought to be enough playing around. You mustn't let me spoil you."

The youngest-ever chancellor of the kingdom of Palretta who runs the kingdom's daily affairs with absolute competence.

She serves the protagonist, her king, with distinction, as his closest aide in official matters. In her eyes, the country far outweighs her own life, and she has no interest in pursuing love.

Though imperturbable and unruffled herself, she exhibits considerable kindness and thought for the needs of her new sovereign, to the point of being very tolerant of his foibles, accepting him for who he is from beginning to end.

Spoiler

She is the protagonist's older half-sister, born of the same mother. As a child, she took on the task of raising him until he turned eight, when he was transported to Earth. She loves him deeply and intensely to the point of obsession.