Ruby is a white Japanese hare with pink inner ears. Her Jewel Eyes are made out of cherry red rubies. For her attire, she wears a pastel pink cherry blossom flower around her left ear with a cherry red star in the center of it and a pink pearl necklace with a pair of red cherries around her neck. Ruby's Jewel Charm is oval-shaped. It is cherry red in color and has an embedded heart-shaped ruby with four ruby crystals surrounding it. It is also decorated with white gold lines. The white gold changes to pure gold when it's powered up in the final episode of the first series. In Jewelpet, Ruby is very air-headed, joyful, brash, happy and a big troublemaker, who sometimes wants to go her own way, despite being told to stop at one place. She also acts like a little sister to her partner Rinko Kougyoku, but sometimes has a hard time handling her antics. Despite all of this, she and Rinko always settle their differences and help each other out. In Ruby's official setting in the franchise, she represents Luck. As the Jewelpet of Luck, Ruby's magic can enhance one's luck. In Jewelpet and Jewelpet Twinkle☆, she has the power of Courage, which allows humans to become courageous and work up their courage to do something extraordinary. In Jewelpet, Ruby is ranked in the Acrylic Class because of her magic, which has a 1% success rate and can cause bad luck and explosions if it fails. However, its reliability is varied; even after Ruby had been upgraded to Super Crystal Class by learning a new lesson of courage and had been trained with Labra to temporarily upgrade her magic in order to summon Opal, her magic still causes explosions. Ruby can also use the Jewel Pocketbook alongside Rinko to awaken Jewelpets from their charm forms.