Rin, also known as Citron, is a female parakeet Jewelpet embodying prosperity. Her identity is marked by citrine jewel eyes granting magic focused on business success. She boasts lime green feathers, a yellow beak, pink talons, and eyes shifting from tangerine-orange to gold-yellow. Rin consistently flaunts a pink bow behind her head and a silver beaded necklace featuring a butterfly-shaped citrine pendant. Her Jewel Charm manifests as an oval green charm with a golden butterfly center, white heart-shaped decor on top, and flower-shaped decor accented with citrine at the bottom.

Born on November 23 in Jewel Land, her birthday aligns with the citrine birthstone, placing her under the Sagittarius sign. She stands as the only bird among the Jewelpets and one of the few non-mammals, alongside Aqua and Charotte. Rin speaks in a distinctive Kansai dialect and habitually ends sentences with "rin" as a verbal tic. Core aspects of her personality include a sharp business mindset, a penchant for comedic storytelling, and a love for spreading rumors. She often carries an abacus for calculations and insists on payment through comedy routines for her services. Her characterization shifts across the series: she demonstrates maturity and sensibility as a foil to her partner Moldavite in *Jewelpet Twinkle*, while *Jewelpet Happiness* amplifies her prankster tendencies, occasionally veering into arrogance or insensitivity before she acknowledges her mistakes and makes amends.

Her roles evolve throughout the franchise. In the first *Jewelpet* series, she partners with Raako Menma to lift a curse on his family restaurant, using her magic to achieve business success. *Jewelpet Twinkle* positions her as an advisor and mentor at the Magic Academy alongside Headmaster Moldavite, guiding students like Ruby. For *Jewelpet Sunshine*, she is paired with Prince Kameo. Rin's magic, tied to prosperity, varies in focus: Sega Toys emphasizes financial luck and wealth accumulation, while other seasons or media broaden it to encompass business success and general fortune.

Classified under the Magical Red attribute, Rin wields fire-manipulation abilities consistent with that group. Her skills extend beyond magic to include business acumen and unique agility, such as flying unaided by a broomstick—a trait shared only with Io and Aqua in earlier series, though later deemphasized. Her development showcases adaptability, transitioning from a pragmatic problem-solver in early appearances to a nuanced figure balancing humor with responsibility in later narratives.