Pêche is a significant character in the anime *Fumoon*, a member of an ancient alien race stranded on Earth for centuries. Her people arrived long ago and now seek to return to their home planet, observing humanity while attempting to repair their damaged spacecraft. Pêche masters human language, customs, and emotional mimicry, operating under a human guise and seamlessly integrating into society. This makes her a vital liaison between her alien group and humans as she navigates societal complexities to advance her people's mission.

Her background involves participation in a covert effort to gather resources and knowledge necessary for the spaceship's restoration. Throughout the series, she relies on intelligence, adaptability, and quick thinking, frequently aiding human protagonists like Kenichi and his associates. She forms a bond with Kenichi's sister, Pichi (also known as Pinoko), and collaborates with human scientists including Dr. Yamadano, Dr. Ochanomizu, and Dr. Frankenstein. Her interactions reveal a commitment to mutual survival in the face of an existential threat: a lethal black gas cloud approaching Earth.

Pêche's development centers on evolving from an observer to an active participant in humanity's plight. When her people decide to evacuate Earth using their ships—rescuing animals but abandoning humans—Pêche defies this plan. She allies with the human characters, contributing her knowledge and resources to help develop a human escape vessel. This decision underscores her empathy and loyalty, marking a shift from detachment to solidarity. Her actions prove pivotal in the narrative's climax as collective efforts to save both species culminate in a resolution.