Flappy, a flower spirit from the Land of Fountains, manifests as a small, pale blue-white fairy adorned with sky blue markings. His black eyes frequently take on a dark red hue, and a flower bud symbol graces his forehead. His tail culminates in a matching floral shape. He accessorizes with a red-to-pink necklace featuring a golden yellow orb. His name blends "flower" with the concept of something flapping or waving in the breeze.

Responsible and assertive, Flappy naturally takes command during critical moments. He voices his thoughts directly and exhibits unwavering determination to protect loved ones or achieve objectives. While he sometimes bickers with his human partner, Hyuuga Saki, he consistently supports her and defends her in crises. A key trait is his shyness concerning romantic feelings for the bird spirit, Choppy. Mentions of his crush trigger defensive overreactions, often resulting in comedic awkwardness. Flappy ends his sentences with the verbal tic "~rapi".

He functions as Saki's transformation device, enabling her to become Cure Bloom. Following an encounter with the moon spirit Moop and wind spirit Foop from the Fountain of Sky, Flappy channels Moop's power. This allows Saki to achieve an upgraded form, Cure Bright, after Flappy and Choppy are captured and injured by the villain Goyan. Post-recovery, aided by Moop and Foop's powers, Flappy retains his ability to gather spiritual power from the earth. This ensures Saki can access both Cure Bloom and Cure Bright forms as required.

His relationship with Choppy drives much of his development. Flappy harbors a significant, unspoken crush, frequently displaying affection through gestures and hints that Choppy overlooks. His romantic attempts, like re-enacting movie scenes with her, typically end in comedic failure. By the series' conclusion, an implied successful confession leads to her acceptance. With Saki, he shares a home and a bond defined by mutual care despite arguments, evidenced when he nursed her through a cold after initially doubting his own illness caused her tardiness.

Flappy's history began when he and Choppy, as balls of light, met young Saki and Mishou Mai at the Sky Tree. They reunited five years later, revealing their identities and urging the girls to become Pretty Cure warriors against Dark Fall. Key events include his temporary capture by Goyan to locate the Fountain of Sun, and his pivotal role in the final battle. There, his flower powers combined with Choppy's bird powers and the wind/moon powers of Michiru and Kaoru to unleash the ultimate attack, Spiral Heart Splash Star, defeating Goyan. In the non-serial movie, Flappy aided Saki and Mai in navigating an endless maze within the Land of Clocks, highlighting their cooperative dynamic.

Trivia notes include Flappy's preference for rice-based foods, his ears straightening when frightened, and his status as one of the franchise's first mascots featured in an image song.