Penny Ling, sometimes referred to as simply Penny, is a panda with a gift for rhythmic ribbon dancing. Out of all of the pets, she is shown to be the most shy and sensitive in nature.

Penny Ling is generally kind-hearted, sweet, and thoughtful. She tries to be helpful, but her help sometimes causes unwanted results. She is very sensitive, and her feelings can be easily hurt as shown in "Penny for Your Laughs," when Pepper teased her and made hurtful jokes about her (which resulted in Penny bursting into tears). However, in "The Very Littlest Pet Shop," she simply became irritable when the same thing happened.