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Ruby is Meimi's cute, brown pet hedgehog. While Ruby is obtained midway through the manga series, she's introduced early on in the anime series. She was bought by a man, then Meimi stole her to protect the gem that the man-made her swallow. Ruby knows Meimi is Saint Tail and has been on a caper with her, inspiring a "hedgehog magic spell".
Ruby wears a black ribbon similar to Saint Tail's, and speaks by saying "Kyuu". Meimi has to keep Ruby hidden from Asuka Jr. so he won't recognize her from a previous caper.