Ruby, a Japanese hare Jewelpet embodying luck and courage, boasts white fur, pink-tipped ears, and ruby-eyed brilliance. Her left ear anchors a pastel pink cherry blossom, while a pink pearl necklace dotted with red cherries adorns her neck. In human guise, cherry-red hair cascades beside a fuchsia-magenta school uniform, accessorized to echo her Jewelpet motifs. Her persona shifts across partnerships: in her debut series, air-headed brashness sparks playful troublemaking, clashing with partner Rinko Kougyoku yet underscored by steadfast loyalty. Magic often backfires—explosive mishaps stem from her Acrylic Class ranking’s 1% success rate—but perseverance elevates her to Glass Class upon grasping courage’s essence. "Twinkle☆" reveals her softer side as Akari Sakura’s nurturing confidante and Labra’s pseudo-sister, radiating unshakable optimism. "Sunshine" ignites rivalry via a crush on Mikage, fueling clashes with roommate Kanon before heartfelt reconciliation. Spells like "Puri Puri Pururin Purirism! Open! Jewel Heart!" awaken Jewelpets, while "Puru Puru Prism Jewerhythm! Ruby Jewel Flash!" falters comically. Collaborative magic—via Rinko’s Jewel Pocketbook or allies Garnet and Sapphie—anchors her luck- and courage-enhancing powers. "Magical Change" unveils a fractured past: separated from friend Luea during Jewel Castle’s collapse, a childhood spell misfire knocks human Airi Kirara unconscious, triggering Ruby’s vanishing act. Reuniting years later, Airi’s pendant unlocks Ruby’s human transformation, fueling their quest to reignite faith in magic. Here, alternate-universe counterparts inspire her evolution from mischievous liability to driven heroine. Roles diversify further—mentoring Momona in "Lady Jewelpet," café-based rivalry-turned-camaraderie in "Happiness," shopkeeping in "Kira☆Deco!," and high school antics in "Sunshine." A hinted romance with Granite lingers ambiguously. Through every iteration, humor and loyalty intertwine, cementing Ruby as a dynamic, adaptable force across realms.