Midori Norimaki, born Midori Yamabuki, serves as a teacher in Penguin Village and becomes the object of Senbei Norimaki’s affection, who nurses unrequited feelings for her. Their relationship unfolds through comedic misunderstandings, culminating in Senbei’s proposal—delivered under the mistaken assumption she cannot hear him. Defying expectations, Midori accepts, leading to their sudden marriage and her adoption of the Norimaki name.

Their abrupt wedding, a narrative decision reflecting the creator’s intent to sidestep extended romantic arcs, thrusts Midori into motherhood as stepmother to Senbei’s robot daughter, Arale. Later, she bears their biological son, Turbo—a development laced with absurdist humor, given Senbei’s comical ignorance of human reproduction.

With no prior ties to the Norimaki family, Midori emerges as a stabilizing force against Penguin Village’s chaos. Post-marriage, she navigates domestic life, managing household duties and parenting amidst the family’s eccentricities. The narrative centers on her interactions with the family and the village’s surreal events, maintaining her grounded presence without exploring her past.

At 23, Midori confronts sudden parenthood and marriage with pragmatic resilience. Her patient demeanor contrasts Senbei’s immaturity, and while her teaching career recedes from focus, her identity becomes entwined with familial responsibilities.

Spin-offs and adaptations preserve Midori’s role without expansion, consistently depicting her as the Norimaki household’s anchor amid relentless absurdity.