Sheila B. Shwell is a female anthropomorphic turtle with a unique talent for travelling faster than running on two feet. She is the youngest sister and former member of the Shwell Girls, the daughter of a famous shellboarder, and Fast-Talking Jack's new co-worker.
- Sheila B. Shwell has so much in common with everyone at Fast-Talking Jack's Carnival. She has the dancing skills of Marvin, the friendliness of Fast-Talking Jack, the caring and kindness of Eddy, the emotions of Elizabeth, the frustration of Stripes, the balance skills of Diamonds, the intelligence of Edna, and a little shyness of Mr. P. Nutty.
- Like Tinker Bell from Peter Pan, Sheila's face turns fiery red at times when angered.