*Francis "Frankie" Foster is the granddaughter of Martha Foster and the jane-of-all-trades that helps keep her grandmother's foster home running in the series Foster's Home for Imaginary Friends. She is voiced by voice-acting/singing veteran, Grey DeLisle.

"Bus the Two of Us" reveals via Frankie's driver's license that she was born on July 25, 1984, making her 15 years old (five weeks away from her 16th birthday) at the time when her license was issued on May 18, 2000, four years before the show premiered.

It is unclear how much older than this she is, except that her license expires in January 2007 and it hasn't expired as of "Bus the Two of Us", making her under 23 years old, since she would turn 23 on July 25, 2007.

In the episode, "Frankie My Dear", Frankie directly says she is 22.

Considered as pretty by several characters, Frankie is a pale-skinned young woman of tall and slim stature, with green eyes (according to her driver’s license) and long, spiky red hair with bangs, usually kept into a high half-ponytail by a black hair tie. She also accessorizes her hair with a deep-purple hair clip.

Her usual clothing features a thin black choker around her neck, a large green hoodie-jacket over a cropped, dark red-and-white ringer tee with minimalistic Powerpuff Girls symbols depicting Bubbles, Blossom, and Buttercup on the front, a deep-purple skirt, golden-orange socks, and blue-and-white trainer shoes. She also accessorizes with multiple piercings on her ears.

Frankie is generally a kind, friendly and caring woman. Being the caretaker at the foster home, she is very hardworking and tries to keep everyone and everything on track.

Due to her job, she is prominently more level-headed and rational as she tends to act as the voice of reason, especially in comparison to Mr. Herriman's bossy demeanor and the absent-minded nature of her grandmother. However, she isn't above being just as zany and childish as other characters, and furthermore this can result in her having not-so-nice moments, which is a high contrast to her normally good-natured personality.

Because of her having to deal with Mr. Herriman's bossiness, Duchess's demands, and Bloo's antics, Frankie will become sarcastic, stubborn and even short-tempered when they push her too far. She also isn't afraid to be physical, particularly seen in "Frankie My Dear" when she overheard Dylan Lee badmouthing her friends.

In "Cookie Dough", it is revealed that Frankie is highly obsessed with Madame Foster's chocolate-chip cookies, so much so that she will hoard dozens of boxes, lock herself in her room, and binge-eat them. During this, her sanity will slowly slip bit by bit, until eventually she will think nothing but eating cookies.

It's safe to say that, out of all the main characters of the show, she is perhaps the most unluckiest, often finding herself in frustrating and/or humiliating situations, whilst suffering the short end of the stick.

Dislike(s) Duchess' temper tantrums Mr. Herriman's constant over-enforcing of the house rules Working (sometimes) Cooking (sometimes) Cleaning (sometimes) Scrubbing (sometimes) Taking orders from Mr. Herriman Being called Francis Terrence and his bullying Cheese entering Foster's (formerly) Imaginary friends causing trouble (especially Bloo) Being overworked and stressed Bloo's get-rich quick schemes Idioticness Suffering Vic Trolla's megaphone Douglas and Adam (on her side) Stinky feet Laziness Not being appreciated Ghosts Dylan Lee*