List of Foster's Home for Imaginary Friends characters

The main characters of the show. From left to right: Coco, Bloo, Mac, Eduardo, Frankie Foster and Wilt

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

Main characters

• Mac (voiced by Sean Marquette) – A bright and creative eight-year-old boy and Bloo's creator and best friend who visits Foster's every day. Mac is often the voice of reason among his friends (especially Bloo) when they are making decisions. However, his good nature tends to make him somewhat naive. He is very attached to Bloo and it is shown in episodes such as "House of Bloos" and "Duchess of Wails" that his biggest fear is never seeing him again because Bloo is what keeps him happy and cheerful and vice versa. Mac becomes extremely high and hyperactive to the point of a rabid mania when he eats sugar. Once in this state, he will become impossible to control, will often become obsessed with seeking any other source of sugar, and if he gets hyperactive enough, will run around naked or in his underwear. He also has a huge crush on Frankie. Mac and Bloo are the two main protagonists of the series.
• Bloo (voiced by Keith Ferguson) – Mac's imaginary friend and best friend who resembles a simple, domed cylinder. Bloo is often very dim-wit self-centered and egotistic as well as having a knack for getting in trouble. Despite all this, he still has a good heart and apologizes for his actions. Bloo loves paddle-balls even though he cannot make the ball hit the paddle (though the only time he was able to do it was in the episode "Let Your Hare Down"). His full name is "Blooregard Q. Kazoo". He became increasingly mischievous over the run of the series and can be a show-off. He is the only character to appear in every episode of the series. Note: Bloo was mentioned by Eric Cartman in the South Park trilogy episode "Imagination Land" as well as making a cameo appearience briefly. Mac and Bloo also made a cameo appearance in The Powerpuff Girls Series Finale: "The Powerpuff Girls Rule!"
• Wilt (voiced by Phil LaMarr) – A very tall, friendly, caring, kind, helpful, red-colored disabled friend with only a right arm and crooked left eye-stalk (which he describes as "wonky"). However, in "Good Wilt Hunting", it is discovered that he was not always this way; he was injured in a fateful accident during a basketball game, leaving his left eye crushed and his arm injured (and fell off sometime before or after he got to Foster's). 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, saying "I'm sorry" in almost every sentence. Wilt has a big heart, is frequently cool and collected, and, only on very rare occasions shows anger at all. His name is an homage to NBA star Wilt Chamberlain. Wilt was shown to be created by Jordan Michaels, a basketball star (and a homage to Michael Jordan). His over-sized basketball shoes always squeak against the floor/ground, no matter what surface he is walking on. According to the episode "Room with a Feud", between him, Coco and Eduardo, he has been in the house for the longest time.
• Eduardo (voiced by Tom Kenny) – A Spanish/Latino guardian friend. Eduardo is big, hairy and violet-purple, has horns, a snout, a pointy demon-like tail and large teeth. Despite his large size, overwhelming strength, and menacing demeanor, Eduardo is docile, timid, lacks confidence, is very compassionate, and has a toddler-like 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 (voiced by Candi Milo) – A bird-airplane-palm tree friend who can only say (or write) her name at various speeds and different emphases. A talent unique to her is her ability to lay colorful, plastic eggs containing a plethora of objects from customized baseball cards to money, at will. Mac, Bloo, Eduardo, Frankie, Wilt, and others usually understand her when she speaks, and often translate for her (though Wilt once admitted that he has no idea what she attempts to convey). Despite her helter-skelter 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, in reference to the late writer, Douglas Adams.
• Frankie (voiced by Grey DeLisle) – Madame Foster's redheaded granddaughter and Mac's love interest, addressed as "Miss Frances" 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, having to take care of everyone and everything in the house, and Bloo's mischief-making (all of which cause her tremendous stress and a bad temper), 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. She once made a cameo appearance in the The Powerpuff Girls Series Finale: "The Powerpuff Girls Rule!".
• Mr. Herriman (voiced by Tom Kane) – A gray and white elderly anthropomorphic lop ear rabbit friend imagined by Madame Foster who speaks with a British accent. He wears a tailcoat, white gloves and a top hat, as well as a monocle over his left eye (though it is sometimes seen over his right eye). He is in charge of the house (the "President" of Foster's) and is extremely strict about the house rules (or just politeness and order in general), 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 didn't. 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. Mr. Herriman may be considered unruly Madame Foster's superego. On the other hand, Herriman has a love/hate relationship with Frankie, usually working with her to preserve order at Foster's, yet just as often scolding her for what he perceives (often inaccurately) as "laziness" and "immaturity" from her part (usually stemming from the fact that the amount of work she has to do is too much for her to get all of it done in certain time frames). However, at the end of the 90-minute special "Destination: Imagination", Herriman admits that he was wrong and finally comes to respect and appreciate Frankie. He also has fear of dogs (due to the fact that dogs are natural predators of rabbits) and is easily scared out of his wits whenever he comes across a dog as shown in the episodes "Who Let the Dogs In?", and "Setting a President". 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 (voiced by Candi Milo) – The founder of Foster's and grandmother of Frankie. Madame Foster is elderly but has childlike boundless energy and enjoys life to its fullest. Her imaginary friend is Mr. Herriman, whom she imagined when she was a child and never gave up. Like Bloo, Madame Foster occasionally becomes hyperactive and mischievous. However, there are times she's shown to be the wisdom of the house.

Recurring characters

• Duchess (voiced by Grey DeLisle) - A "high-maintenance" pedigree friend who is pompous, ugly, rude, arrogant, selfish, self-centered, 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 (despite this, she has helped someone in four episodes, albeit for selfish reasons). Whenever Duchess turns on the spot, her entire body pivots like a sheet of paper being flipped, revealing that she is two-dimensional (however, in the pilot movie "House of Bloo's", she was not two-dimensional). Her full name is "Her Royal Duchess Diamond Persnickety the First, Last, and Only". She speaks with a German accent.
• Goo (voiced by Grey DeLisle) – A hyper-imaginative, talkative girl who first appeared in the episode "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 friends because she had no real friends because of her odd behavior. She finally stopped making new friends 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. She looks a little older than Mac, though it's never been stated how old she is.
• Terrence (voiced by Tara Strong) – Mac's 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, usually trying to keep Mac and Bloo from seeing each other ever again. His stupidity always gets the better of him, making him easily outsmarted by Mac or Bloo.
• Cheese (voiced by Candi Milo) - A simple, pale-yellow-colored 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 dim-witted, often saying incoherent or non-sequitur phrases, and breaking into sudden bouts of screaming when frightened or when he doesn't get his way. Cheese likes goldfish crackers, cereal, juice, chocolate milk (although he is lactose-intolerant), etc. In the series finale "Goodbye to Bloo", he becomes the newest resident at Foster's, much to the other residents' horror.

Recurring Imaginary Friends

• Fluffer Nutter (voiced by Grey DeLisle)
• Bloppy Pants (voiced by Jeff Bennett)
• Yogi Boo Boo (voiced by Tom Kenny)
• Billy The Squid (voiced by Keith Ferguson)
• Sunset Junction (voiced by Keith Ferguson)
• Jackie Khones (voiced by Phil LaMarr)
• Uncle Pockets (voiced by Kevin Michael Richardson)

Other characters

• World (voiced by Max Burkholder): An imaginary friend and the main antagonist of the 90-minute special "Destination: Imagination".