The Prime Minister is a recurring human character in the sixth anime series of GeGeGe no Kitarō, portrayed as the female head of government of Japan. Her real name is never revealed in the story, and she is identified only by her title. She appears whenever a large-scale conflict develops between the human world and the yokai world, and among the human supporting cast she is one of the more frequently featured characters.

As the leader of the nation, she is shown making sincere efforts to protect the safety of her people and her country when supernatural threats arise. In that sense, her stated motivations are those of a responsible national leader concerned with public welfare and national security. However, her methods tend to be extreme, and over the course of her appearances the story reveals that she lacks the temperament and judgment needed to be a truly capable and righteous leader. Her decisions during emergencies reflect a tendency toward drastic, forceful responses rather than careful or balanced reasoning.

Her role in the story is primarily that of a human authority figure who reacts to the supernatural events involving Kitarō and the yokai. She represents the human establishment in confrontations between the two worlds and is involved whenever the scale of a dispute rises to the level of a national crisis. Because her authority places her at the center of such conflicts, she functions as a key human counterpart to the yokai side, even though she does not herself wield any supernatural abilities. Her power lies entirely in her political and military authority as prime minister.

Her most significant relationship within the story is with the antagonist Nurarihyon. In the final story arc, Nurarihyon skillfully manipulates her, gradually guiding her into a state of mind filled with hatred toward yokai. Under this influence, she becomes one of the forces driving both humans and yokai into a devastating war. In that same arc, she also becomes entangled with the revived Western yokai army led by Backbeard, whose schemes further feed the conflict. Her interactions with Kitarō and his allies are shaped by her position as a human leader confronting beings she comes to regard as enemies.

Her development follows her descent from a leader trying to protect her nation into a figure consumed by hostility and manipulated into supporting a destructive war. In the series finale, the characters who did not want the war and who acknowledged their mistakes are reconciled, while the Prime Minister, along with Nurarihyon, Backbeard, and the other masterminds who refused to admit their errors, meets her end as the conflict resolves. Her story thus serves as a cautionary example of how fear and manipulation can lead even a well-intentioned public figure to become an agent of catastrophe.