List of Foster's Home for Imaginary Friends characters

This is a list of characters from the Cartoon Network animated television series Foster's Home for Imaginary Friends.

Mac
Mac (voiced by Sean Marquette) is Terrence's younger brother who is a bright, shy, and creative eight-year-old boy and Bloo's creator who visits Foster's every day. Mac is often the voice of reason among his friends when they are making decisions. However, his extremely good nature tends to make him somewhat naive. He is very attached to Bloo and it is shown that his biggest fear is never seeing him again, because Bloo is what keeps him happy and cheerful and vice versa. Mac becomes hyperactive to the point of a rabid mania when he eats sugar. Once in this state, he becomes impossible to control, will often become obsessed with seeking any other source of sugar. He, alongside Bloo, made a cameo appearance in The Powerpuff Girls series finale, "The Powerpuff Girls Rule!".

Bloo
Blooregard "Bloo" Q. Kazoo (voiced by Keith Ferguson) is Mac's best friend and imaginary friend, Bloo is a blue-colored friend who resembles as a dome cylinder not unlike a bollard with two eyes. He is often very immature, happy-go-lucky, self-centered and egotistical as well as having a knack for getting in trouble and prone for doing kid's and children's antics. Despite all this, he still has a good heart and apologizes for his jealousy. Bloo loves paddle-balls and toys even though he cannot make the ball hit the paddle. His full name is Blooregard Q. Kazoo. He, along with Mac, made a cameo appearance in The Powerpuff Girls series finale, "The Powerpuff Girls Rule!".

Wilt
Wilt (voiced by Phil LaMarr) – A very tall, friendly and incredibly nice imaginary friend with only a right arm and a crooked left eye-stalk. However, in "Good Wilt Hunting", it is discovered that he was not always this way; he was injured during a basketball game, leaving his left eye crushed and his left arm injured. Wilt exhibits consummate good sportsmanship, which he applies to every part of life he can. He is considered the nicest person at Foster's and is known for being excessively polite and apologetic; this is often taken advantage of by the other imaginary friends. Wilt has a big heart, is frequently cool and collected, and, only on very rare occasions shows anger at all, at which point, he will express his anger in overdramatic hysterics. According to the episode "Room with a Feud", among him, Coco and Eduardo, he has been in the house for the longest time. He is named after basketball legend Wilt Chamberlain.

Eduardo
Eduardo (voiced by Tom Kenny) is a big, hairy and purple Spanish-speaking imaginary friend who resembles a mixture of a minotaur and one of the beasts from Maurice Sendak's storybook, Where the Wild Things Are with horns, a snout, a pointy demon-like tail and large teeth. Despite his large size, overwhelming strength, and menacing demeanor, Eduardo is usually docile, timid and has a somewhat overly sensitive nature, crying at minor negative occurrences, and being scared of almost everything. However, he can be ferocious if angered or in the circumstance that danger befalls his friends. Eduardo has a fondness for potatoes, dogs, and his cuddly toys. His creator, Nina Valerosa, created him to protect her in a rough neighborhood and is now a police officer.

Coco
The Coco Bird (voiced by Candi Milo) is a chicken-like imaginary friend with a palm tree for a head, a crooked red beak and an aeroplane-like body who can only say her name at various speeds and different emphases. A talent unique to her is her ability to lay colorful eggs containing a plethora of objects. Mac, Bloo, Eduardo, Frankie, Wilt, and others usually understand her when she speaks, and often translate for her. Despite her appearance and quirky behavior, she can demonstrate a perceived intelligence, principle and kindness. No one knows who her creator is as she was found on a South Pacific island by two scientists named Adam and Douglas.

Frankie Foster
Frankie Foster (voiced by Grey DeLisle) is Madame Foster's redheaded 22-year-old granddaughter, addressed as "Miss Francis" by Mr. Herriman. Her parents are never seen in the series. 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, she is usually very friendly, outgoing and laid-back. According to her driver's license in "Bus the Two of Us", she was born on July 25, 1984. Frankie is friends with most of the imaginary friends at Foster's (particularly Wilt, Eduardo, Coco, and Bloo) and can be described as a protective big sister to them, but sometimes gets unsuccessfully annoyed at Bloo, Mac, Cheese, Madame Foster and Mr. Herriman.

Mr. Herriman
Mr. H. Herriman (voiced by Tom Kane) is a gray and white, large, elderly, anthropomorphic, lop-eared and rabbit-like British accented imaginary friend imagined by Madame Foster, in fact, quite similar to Bruce Wayne's butler, Alfred Pennyworth. He wears a tailcoat, white gloves and a top hat, as well as a monocle. He is in charge of the house and is extremely strict about the house rules, but he is also seen to put the rules before common sense, as seen in "Destination: Imagination" when he sticks to the rule written on the chained up toy box of never letting the imaginary friend who is trapped in there out despite what would happen to him if he did not. He is often found punishing Bloo for his various misdemeanors. It was revealed in "Busted" that the reason Mr. Herriman is so hard on Bloo is because he feels that, given that he is allowed to stay at Foster's even though he still has an owner, he has already broken one of the main house rules. He is extremely fond of his creator Madame Foster, harboring great respect and loyalty to her, even at her most prominent levels of unabashed pep and energy. He has a fear of dogs (due to the fact that dogs are the natural predators of rabbits) and is easily scared out of his wits whenever he comes across one. He also has a rabbit's stereotypical obsession with carrots and will do anything to have them, as demonstrated in "Crime After Crime".

Madame Foster
Madame F. Foster (voiced by Candi Milo) is the founder of Foster's and grandmother of Frankie. She's an old person but has childlike boundless energy and enjoys herself to the fullest. Her imaginary friend is Mr. Herriman, whom she imagined when she was a child and never gave up, and is the only one who can control him. Like Bloo, Madame Foster occasionally becomes hyperactive and mischievous. However, there are times she is shown to be the wisdom of the house.

Recurring characters

 * Duchess (voiced by Grey DeLisle) - A banshee-like high-maintenance pedigree imaginary friend who is pompous, ugly, rude, arrogant, selfish and lazy up to the points she orders Frankie to open her eyelids for her first thing in the morning. She considers herself superior to all the other imaginary friends, is extremely negative towards everyone, and never says anything nice. Whenever Duchess turns on the spot, her entire body pivots like a sheet of paper being flipped, revealing that she is two-dimensional. Her full name is "Her Royal Duchess Diamond Persnickety the First, Last, and Only". She speaks with a German accent. Details about Duchess's life before moving to Foster's or who created her remain a mystery since neither Duchess nor her creator were even shown at the reunion in "Good Wilt Hunting".
 * Mac's Mom (voiced by Grey DeLisle) - The mother of Terrence and Mac who is rarely shown but often mentioned. She tells her youngest son Mac to give up Bloo because she gave up her imaginary friend at his age. She seems completely unaware that Mac visits Bloo at Foster's everyday.
 * Goo (voiced by Grey DeLisle) – A hyperactive, happy-go-lucky, overly imaginative and talkative African-American girl who first appeared in "Go Goo Go". Her parents allowed her to name herself when she was a baby resulting in the full name "Goo Goo Ga Ga". Goo enjoys playing games such as Checkers and Truth or Dare, but she does not know how to play and Mac is the only one who notices. In her first appearance she constantly created imaginary friends because she had no real friends because of her eccentricity. She finally stopped making new friends and undoes them after Mac told her to get to know the ones she had made already. However, she has still created a few by mistake or to help on rare occasions. She is also shown to be friends with Cheese, as both of them get along because of their odd doings. Despite appearing older than Mac, her exact age has never been stated.
 * Terrence (voiced by Tara Strong) – Mac's sadistic older brother and the recurring villain of the series. He enjoys bullying Mac and coming up with various schemes to make Mac's life hard and miserable. His stupidity always gets the better of him, making him easily outsmarted by Mac or Bloo.
 * Cheese (voiced by Candi Milo) – The simple, dimwitted, light yellow imaginary friend who debuted in "Mac Daddy". Cheese was thought to be an imaginary friend accidentally created by Mac, but was actually created by Mac's neighbor Louise. He appears to be a nuisance and dimwitted, often saying incoherent or non-sequitur phrases, and breaking into sudden bouts of screaming when frightened or when he does not get his way. Cheese likes goldfish crackers, cereal, juice, chocolate milk (although he is lactose-intolerant), etc.. He is prone to flatulence. In the series finale "Goodbye to Bloo", he becomes the newest resident at Foster's due to Louise moving to an apartment that doesn’t allow imaginary friends, much to the other residents' horror.

Recurring imaginary friends

 * Fluffer Nutter (voiced by Grey DeLisle) – A small pink squirrel-like friend.
 * Bloppy Pants (voiced by Jeff Bennett) – A shy and nervous grey tabby cat-like friend.
 * Yogi Boo Boo (voiced by Tom Kenny) – A tall green giraffe-like friend who speaks with an Indian accent. His name is a parody of Yogi Bear and Boo-Boo Bear.
 * Billy the Squid (voiced by Tom Kenny) – A pink octopus/alien-like friend with 3 horn-like appendages on his head.
 * Sunset Junction (voiced by Keith Ferguson) – A tall navy blue bear-like friend with carpet-like fur wearing a woolen scarf.
 * Jackie Khones (voiced by Phil LaMarr) – A tiny green one-eyed stick figure-like friend. Despite his tiny size, He speaks in a deep voice.
 * Handy (voiced by Keith Ferguson) – A friend who appears as an animate baseball mitt.
 * Scissors (voiced by Tom Kenny) – A friend who resembles a pair of scissors with bird-like legs with the scissors forming a beak.
 * Uncle Pockets (voiced by Kevin Michael Richardson) – An old clown-like friend who resembles Willy Wonka, the Cat in the Hat or the Mad Hatter, considered widely to be the best imaginary friend ever.

Other characters

 * World/Tyrant King (voiced by Max Burkholder) – An imaginary friend, and the main and later former antagonist of "Destination: Imagination".
 * Red (voiced by Phil LaMarr) – Terrence's imaginary friend and rival, who he creates in "Seeing Red". Red is a red-colored cube-like creature similar to Bloo with arms and a face but no legs and refers to himself in third person.
 * Ivan (voiced by Kevin McDonald) – A seeing-eye friend created by a blind kid named Stevie (a parody of Stevie Wonder and Steve Urkel) with over 100 eyes. He is first seen in "Sight for Sore Eyes".
 * Berry (voiced by Grey DeLisle) – A polite magenta friend. Has a crush on Bloo, but dislikes how close Mac and Bloo are. Berry is jealous and disrespectful of Mac despite the latter being Bloo's creator.
 * Bendy (voiced by Jeff Bennett) – A non-canon yellow Grinch-like friend with black stripes, and the main antagonist of the equally non-canon episode "Everyone Knows It's Bendy". Bendy was put up for adoption by his family when they could no longer tolerate his destruction around their house. Immediately after his arrival, he begins committing crimes, such as breaking a vase and leaving mud in the house, and framing the other imaginary friends, getting them punished for his wrongdoings until Bloo comes up with a master plan. Due to Bendy never actually getting any consequence for his actions even by the end of the episode, the other characters being constantly punished for his crimes, and Mr. Herriman and Frankie acting way out of character by siding with him, Bendy's appearance was so infamous that writer Lauren Faust apologized for writing the episode that he appeared in, and he was permanently written out of the show and the episode was declared non-canon as a result. According to Faust, Bendy was originally supposed to be a 30-something-year old human man posing as an imaginary friend, but Cartoon Network executives forced them to rewrite the concept into Bendy himself, leading to Faust and Craig McCracken not liking the character themselves.