Linny the Guinea Pig is the group's leader. Linny is the brains of the outfit, a fearless guinea pig who will do anything to help a fellow creature in need. She represents the developmental age of a five-year-old and is also the oldest of the Wonder Pets. Linny reminds her fellow creatures to value teamwork and trust. Her favorite food is celery.
Ming-Ming Duckling is outgoing and confident. She has recently learned to fly, and she loves flying more than anything, even though she can only get about 4 or 5 feet off the ground. Ming-Ming enjoys being the center of attention, can sometimes be overzealous, and often gets ahead of herself, which provides comic relief in the show. Ming-Ming represents the developmental age of a three-year-old.
Turtle Tuck is a very sensitive young turtle. He is the heart of the group and he has a deep emotional connection to all living things. Tuck loves to give and receive hugs. Developmentally, Tuck is a four-year-old. He is the least physically advanced of the Wonder Pets. He is, however, an excellent swimmer and demonstrates keen observational skills while out on their adventures.