Flappy is a female squirrel living among the forest squirrel community, consistently distinguished by a flower worn in her hair.

She encounters Banner after he becomes separated from his adopted mother cat and enters the forest. Intrigued by his innocence and unique background, Flappy takes an active role in helping him adapt. She teaches Banner essential survival skills and squirrel behaviors crucial for integrating into the community, providing vital guidance as he faces the forest's challenges.

Within the social structure, Flappy is the granddaughter of Graubart, the elder squirrel who holds wisdom and authority. A rivalry emerges as another squirrel, Acacio (sometimes called Spitzohr), develops romantic feelings for Flappy and competes with Banner for her affection, resorting to cunning and underhanded tactics. Despite Acacio's rivalry, Flappy's bond with Banner deepens.

Their relationship progresses to marriage, a key development in her story. This union concludes with them starting a family in the series' final episode, marking a significant aspect of her journey.