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 Mac's enemy, she is more accurately described as a big sister to the imaginary friends.
Occupation: Madame Foster's Grandmother, Big sister of the imaginary friends
Goal: To get Mac arrested (succeeded)
Relatives: Madame Foster (grandmother)
Allies: Mac Foster (formerly), Bloo, (occasionally), Wilt, Eduardo, CoCo, Madame Foster, Mr. Herriman
Enemies: Bloo (occasionally), Mac
Likes: working at Foster's, spanking Mac, Defenestrating Mac, getting Mac arrested, Mac doing mean things to her, torturing Mac
Dislikes: Mac doing nice things for her, Mac welcome at Foster's because of Goo, kissing Mac, Mac
Fate: Kicks Mac out of Foster's, got Mac arrested, go their separate ways, Mac got executed
Frankie has red hair. she wears a white shirt with 2 blue rabbits and 1 pink rabbit on it, her belly can be seen at the end of her shirt, she wears a green jacket and a purple dress, she has orange socks and blue and white shoes.