Linny is the brains of the outfit, a fearless guinea pig who will do anything to help a fellow creature in need. She is oldest of the Wonder Pets. Linny reminds her fellow creatures to value teamwork and trust. Her favorite food is celery, and she eats it every day after saving a baby animal in need. She is the main protagonist of the series.
Linny has brown and tan fur. She has a blue cape with a large red 'W', the Wonder Pets' logo, on its center. Her eyes are black and her hat is an orange baseball cap. Linny's nose is pink and her paws are as well.
Linny is known to have only one relative, her grandmother, named Ginny, who currently lives at a nursing home near the schoolhouse. Linny is shown to be very caring and kind to her grandmother, often embarrassed when Ming-Ming and Tuck see how compassionate Linny is for Ginny.
- Linny has a grandmother, currently living at a nursing home.
- Linny is a female.
- At the end of almost each episode, Linny lands in her cage and winks at the viewer.
- Before Wonder Pets!, Linny starred in a few three-minute shorts called Linny the Guinea Pig, where she would go into space and visit strange planets.
- Often, Ollie the rabbit calls Linny "pig". Whenever Ollie says this, Linny corrects him "That's guinea pig."