Mepple hails from the Garden of Light, serving as the chosen protector of the Princess of Hope, Mipple, a role fostering their deeply affectionate "lovey-dovey" bond. Energy limitations in the Garden of Rainbows force Mepple and Mipple to conserve power, usually residing in energy-saving forms resembling sleek devices called Card Communes (English dub) or Jewel Communes (later appearances). His Japanese speech often ends with "-mepo," a trait absent in dubbed versions. Physically, Mepple is a small fairy with lemon-yellow fur, navy-blue eyes featuring light blue highlights, bearlike ears, and a star-tipped tail. A distinctive male gender symbol adorned with hearts marks his head. His personality blends arrogance from his warrior status with laziness and demanding tendencies; he frequently whines about hunger or manipulates his human caretakers. This contrasts sharply with his gentle devotion around Mipple. Stubborn and short-tempered, he constantly argues with his primary human partner, Nagisa Misumi, despite their profound, unspoken bond. He exhibits jealousy when Mipple interacts closely with Pollun, the Prince of Light. In *Futari wa Pretty Cure*, Mepple arrives in the Garden of Rainbows via meteor shower, crash-landing near Nagisa. Their initial encounter is rocky, as Nagisa recoils from his sentient device form. He urgently pushes her to locate Mipple, leading them to Yukishiro Honoka and triggering their transformation into Cure Black and Cure White to combat the Dotsuku Zone. Mepple resides with Nagisa, feigning laziness while secretly enduring interdimensional strain. A pivotal moment sees him risk his life confronting the villain Ilkubo, declaring to Mipple she must "never lose hope." After defeating the Dark King, Mepple and Mipple face separation but choose eternal sleep in the Garden of Rainbows to stay near Nagisa and Honoka. *Futari wa Pretty Cure Max Heart* revives Mepple and Mipple when the Queen's life falters. They upgrade to Heartful Communes, enabling the Cures' enhanced transformations. During the final battle against the resurrected Dark King, Mepple counters the Cures' despair by affirming he has "no regrets" about meeting them, strengthening their resolve. Post-victory, the fairies briefly depart but return permanently after gaining the ability to survive in the human world, cementing their bond with the Cures. In the fan-made spin-off *Futari Wa Pretty Cure Sky Jewel*, Mepple partners with Fujimura Aika, Nagisa's daughter, after she and Honoka's daughter, Masami, witness their mothers' past. He reveals Nagisa and Honoka's identities as legendary warriors and assists Aika and Masami in transforming into Cure Sunburst and Cure Moonbeam to rescue their missing mothers from the Dark Zone, extending his legacy. In *Pretty Cure All Stars New Stage: Mirai no Tomodachi*, Mepple appears alongside other franchise mascots during the climactic battle against Fusion. He contributes to empowering Cure Echo and the assembled Pretty Cure teams, leveraging collective hope to defeat the antagonist, reaffirming his commitment to protecting multiple dimensions alongside allies.