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Pearl is described as a black cat with a bushy tail and a white star on her forehead. In Heidi the Vet Fairy, she has white fur.
Background
She is named after Pearl the Cloud Fairy because it was right after helping Pearl get her weather feather back that Kirsty got her. One of her neighbour's cats had kittens and asked Kirsty if she would like one. Rachel suggested the name 'Pearl.'