—Frankie laments over Herriman's bossy behavior
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Frances "Frankie" Foster - Madame Foster's 22-year-old granddaughter, addressed as "Miss Frances" by Mr. Herriman. Frankie is the caregiver at Foster's and helps keep everything in order. In spite of Mr. Herriman's fussiness and fixation with rules and cleanliness, having to take care of everyone and everything in the house, and Bloo's mischief-making (all of which cause her tremendous stress), she is usually very friendly and easy-going. And though she may seem somewhat like a surrogate mother to Mac, she is more accurately described as a big sister to the imaginary friends. She is voiced by Grey DeLisle.
- Frankie's driver license states that she is 5 feet and 8 inches tall, but her baseball card states that she is 5 feet and 10 inches tall.