Ryl

Ryl is a miniature pig who is naturally colored. She wears a necklace shaped like a red heart and sometimes carries a mirror like Garnet and Diana.

In Jewelpet, she's the partner of Megumi Hirou, whom she appears to when Diana exacerbates her depression about not having a Jewelpet of her own. Megumi rejects her at first because she thinks Ryl is ugly.

In Jewelpet Twinkle, she's the partner of Catherine Grand Maniel Chocola Julliangeli.

She's in the background in the other seasons.

(Source: Jewelpet Wikia)