Foster's Home for Imaginary Friends RPG

Personality Kooky, sweet, loving, friendly, caring, charming, and always wearing a smile for anyone to cheer them up as their surrogate grandmother, Madame Foster is a fun-loving old woman who always finds a way to have a good time, even if she has to break Mr. Herriman's rules in order to do so; she is truly a kid at heart. She loves having wild tea parties while everyone is out as seen in "Foster's Goes to Europe." Mr. Herriman is never happy about this, but since it was Madame Foster who created him in the first place, he doesn't have much of a say about it. She often pokes good-hearted fun at others, like in "Mac Daddy" where she made jokes about Mac and Cheese and "Bloo Cheese" (a type of cheese). She is quite sneaky and malicious when she needs or wants to be, as seen in "Foster's Goes to Europe", when she stole Mac's tickets to Europe with a rather long hug. She then went on vacation with her friends and a homesick imaginary friend named Eurotrish. In "Something Old, Something Bloo", it's shown that she thinks she's a superhero. As noted by Mr. Herriman, "This never turns out very well." She even bought the stuff Mac put up for auction on internet auction website SchmeBay (a parody of eBay) in "One False Movie", not knowing that she was buying her own stuff or funding much of the movie that Mac and Bloo were making. She also helped Bloo trick Mac into a surprise party disguised as an imaginary friend named Artie, four years old, in "I Only Have Surprise for You".

Madame Foster sometimes makes rude jokes out of someone else's unfortunate situations (most notably while Bloo was eating a horrible meal Frankie specially prepared) with a below-basic level of sarcasm. She dotes on her granddaughter Frankie, but at the same time is not above driving the younger woman to distraction. Madame Foster and Mac seem to be kindred spirits.

Full name: Martha Foster Species: Human Gender: Female ♀ Age: 70 Birthday: April 6, 1934 Like(s):Wild parties, Her granddaughter, Mac, Fun, Adventure, Bowling Dislike(s):Bloo's selfishness and mischief, Putting up with Duchess. Biography Madame Foster founded the home that bears her name. She's had a strange life, having once gotten lost in the house for a week, eating nothing but acorns and toothpaste. She also spent forty-six days in the horse stables when her granddaughter Frankie accidentally let the Scribbles out from the forbidden door in the cold autumn of 1984. She owns what looks like a late 1970's Pontiac Trans Am sports car, complete with the "screaming chicken" on the hood similar to the one shown in the Smokey and the Bandit movies, which she likes to drive around town. She has a long-standing feud with the neighbor across the street, Old Man Rivers. According to her, Rivers borrowed a cup of sugar from her in 1962 "and did not return one single granulatory ounce!" However, Rivers has a secret crush on Madame Foster that he eventually reveals to her. She also possesses a chest of pirate treasure buried near a hydrangea bush on her property.

When Madame Foster was a child, she created her first (and apparently only) imaginary friend, Mr. Herriman, a giant rabbit who wears a top hat, monocle, vest, bowtie, and mustache while speaking in a posh English accent in a personification of the Edwardian era. Herriman would often perform for the younger Madame Foster, doing an assortment of dances and songs, which he continues to do to this very day, much to his own slight embarrassment. Much like with the series main characters Bloo & Mac, Madame Foster and Mr. Herriman are polar opposites. While Madame Foster is kooky and full of boundless and endless energy, Herriman is reserved and obsessed with rule following. However, their friendship remains as strong as it ever was, particularly in the fact that even as Madame Foster grew, she never gave away Mr. Herriman

Full name: Herriman (first name unknown) Species: Imaginary Friend (rabbit) Gender: Male ♂ Like(s):Carrots, His job, Rules, Camping, Forcing Frankie to do chores, Butterscotch kisses Dislike(s):Dogs, People breaking the rules, Frankie's arrogance, Disobedience, Getting arrested, Troubles. Mr. Herriman is a humanoid rabbit with a top hat, monocle, tails, and an English accent, personifying the Edwardian era. He is the head of the house, created by Madam Foster, and the oldest friend at the orphanage (he is sensitive to this). His name is a reference to George Herriman (Krazy Kat) and the word "hare." He is 6 feet tall (7 feet with a top hat) and weighs 210 pounds.

Unlike his carefree creator, Herriman is pedantic to the point of absurdity, imposing silly rules. He addresses everyone as "Mr."/"Miss," except when he panics. He is secretly addicted to carrots. He is afraid of dogs (cynophobia). He lacks social skills: his other friends can't stand him. Frankie dislikes him for his disrespect, but at the end of "Destination Imagination," he realizes his mistakes and offers to help around the house. He hates Blue for her chaos. He often loses arguments with Madam Foster, although their relationship is warm—sometimes he dances "The Happy Rabbit" for her. He is very protective of her.

In the Cartoon Network comic, it is revealed that as a child, Madam Foster blamed him for her prank—and since then, he has been obsessed with order. As the president of the house, he feels needed. He is extremely old-fashioned (thinks the internet is a network). He was created in the 1930s and lives in the past. Despite his strictness, he cares about justice and his charges. He threatens Max with banishment, but guarantees the preservation of the Blue agreement. In the episode "Let Your Hare Down," he gains an alter ego, hippie Harry. Goo mistakenly calls him a badger until the episode "Bus the Two of Us."

Frankie is generally a kind, hard-working, sweet, capable, easygoing, 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, loud, 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.

Full name: Francis Ingrid Foster Species: Human Gender: Female ♀ Age: 22 Birthday: July 25, 1984 Like(s): Mac, Working around the place, Bloo, Soap operas (particularly The Loved and the Loveless), Punk rock, Web-design, Her grandmother's cookies, Imaginary Friend Taking care of, Imaginary Friend, Creating and maintaining Foster's web-page, Going out with her friends on, Friday nights, Rock music, Days off, Having a social life, Mac kindnessz Dylan Lee (formerly), Cheese entering, Foster's (currently) Dislike(s):Duchess' temper tantrums, Mr. Herriman 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 Friend causing trouble (especially Bloo), Being overworked and stressed, Bloo 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 Appearance Considered as pretty by several characters, Frankie is a pale-skinned young woman of tall and slim stature, with bright 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 along with her exposed belly button, a deep-purple skirt, golden-orange socks, and blue-and-white trainer shoes. She also accessorizes with multiple piercings on her ears.

The only word she speaks aloud and uses in writing is "coco" (each syllable is pronounced as "ko"), and most of her imaginary friends, Mac, Frankie, Madame Foster, and other characters, seem to understand her. This can lead to some strange conversations, such as in "Blue's House," when Blue repeatedly answered "yes" every time Coco said "Coco?" because he thought she was asking him if he wanted hot chocolate, until Wilt explained that was all she was saying. When Blue asked what she was actually asking, Wilt replied, "Would you like some juice?"

She also had to perform in front of multiple people in "Hiccups," and in "Store Wars," she used the mall's intercom to alert security guards and shoppers. Additionally, in the episode "Cuckoo for Coco Karts," she gave Mac's classmates a tour of the house, implying that they understood her.

She's usually understandable to everyone, but can be confusing depending on the joke being told. She also seems unable to write anything other than "Coco," and the same rules apply to reading ability.

Full name: Coco Coco Species: Imaginary Friend Gender: Female ♀ Like(s): Her friends, Playing games, Laying eggs, Presents, Murder (possibly) Dislike(s):Her friends being in danger, Bloo being a jerk, having her feelings hurt Character Description Coco is kind, friendly, helpful, funny, silly, absent-minded, and surprisingly sarcastic. Coco has a palm tree-shaped head, a crooked red beak, a blue and white airplane-shaped body, and orange legs and feet. She stands 120 cm tall and weighs 36 kg. According to a golden trading card from the Leapster game Foster's Home for Imaginary Friends, Coco was created by a girl who crashed on a desert island, which may explain her palm tree-shaped head and airplane-shaped body. She was discovered by two scientists named Douglas and Adam. Since they found her alone, the name of Coco's original creator has never been mentioned, and it is unknown what became of her. Although Coco tried to tell Douglas and Adam this, they may have either unintentionally ignored her or misunderstood what she was trying to say. Throughout the episode "Wilt Hunt", she is shown to act as a motherly figure to Douglas and Adam.

Eduardo, despite his intimidating appearance, is one of the kindest friends in the house. He often refers to himself in the third person, uses Spanish phrases, and calls Blue "Azul" (a kind of Spanglish). Although he is a protective friend, he is a true coward: he is afraid even of flies. However, when it comes to protecting his friends or when a real threat arises, he displays immense strength and can knock down any opponent. However, due to his gentle nature, he does not defend himself.

Eduardo envies Blue, considering him "cooler." In trading cards, he is called "a big fat baby," "a chicken," "a cowardly cat," and finally, "a crazy idiot." He is very strong, especially when frightened, when he accidentally defeats opponents in fights. His horns are incredibly strong. Eduardo cares for a pink stuffed elephant, collects Beanie Baggies (a parody of Beanie Babies), adores potatoes ("I like potatoes"), loves dogs, especially puppies, and has a dog named Chewie. His favorite show is a parody of Dora the Explorer. He loves Christmas: he decorates his belt buckle with a skull, his antlers with candy canes, and kisses everyone under the mistletoe.

Eduardo is very rich: in one episode, he is found to have gold bars, dollars, and diamonds. He is a financial genius, having made a fortune in toy stocks (especially Beanie Baggies). It is also revealed that he likes girls' dolls.

Full name: Eduardo Valerosa Species: Imaginary Friend Gender: Male ♂ Age: At least 20 years old Like(s): Paco, Potatoes, Dolls, Dogs, His friends, The TV show Lauren is Explorin', Christmas, Cute animals, Dogs Dislike(s):Bad things happening to his friends, Bloo getting in trouble, Being called a big fat baby, Duchess, Spiders, The dark (especially eclipses), Heights, Mops, Butterflies, Bed bugs, Splashy water, Broccoli, Cards, Exploding cards, Potato famine, Cars, Shoes, 88 napkins, Index cards, Bifocals, 3-ring binders, Transmissions, Rubber bands and chickens, Band aids Left, Pixel pushers, Micro processors, Anecdotes, Lists, Periods, Pepperoni. Appearance Eduardo is a muscular 7-foot tall (to his horns), 542-pound monster-like "guardian friend". He resembles a mixture of a minotaur and beasts from Maurice Sendak's Where the Wild Things Are with purple fur, angled horns, sharp fangs, a pinkish-purple ape-like face, a black scribbly unibrow, black claws, and purple devil-like tail. He wears a black belt with a skull-shaped buckle and silver studs, and gray pants and shoes.

Wilt is an abandoned imaginary friend who became a "helpful friend." He's very kind, constantly apologizes, and doesn't know how to say no, even when it's to his own detriment. For example, he missed a basketball game because of the requests of others. Blue often takes advantage of his kindness by feigning sadness. Wilt is an excellent dancer, but is afraid of large audiences—once, at a competition, he forgot his lines and became paralyzed with fear. Another time, the competition host said that this year Wilt did much better than last year. He's usually flexible, but under certain circumstances he can stand up for himself: when a room with basketball hoops became available, he stood his ground and told Blue he didn't care about his feelings. He also plays the trombone. Wilt can refuse if he's caught making fun of tall people. In one episode, he panics and screams into the phone that he's caught in a lie, can't take it anymore, and is abandoning his friends, but then apologizes. He once got everyone fined for an incident on the beach. Wilt has a dark side, too: in one scene, he apparently slipped Blue a whoopee cushion and smiled smugly.

In "Good Wilt Hunting," his history is revealed. His creator, Jordan Michaels (a play on the famous basketball player Michael Jordan), wasn't very good at basketball, so he created Wilt, who, when created, had a left arm and eye exactly like his current good ones. With Wilt's help, Jordan became unbeatable. For a whole year, they were unstoppable. However, a jealous boy created Foul Larry (a double pun on former Boston Celtics star Larry Bird and the penalty is known as a "foul" in basketball) a giant with a basketball head. Jordan and Wilt faced off against them, and they were ahead 48-47 until Larry went in for a final shot. Wilt was ready to defend, but Jordan was right under Larry when he jumped. Wilt, setting aside the victory, rushed in and pushed Jordan out of the way just as Larry came down, saving Jordan's life, but crushing Wilt's left arm, leaving it crooked. The ball went through the basket and knocked out his left eye, bending it into its current shape and blinding him as well. His left arm was later amputated, leaving it as a stump. (As for the scars on his face, it was from surgical procedures after the tragedy.) Jordan was so upset about the loss, that Wilt, distraught, ran away. It wasn't until Stats, the scorekeeper, told Jordan what happened that he went to look for Wilt, but all he found was the wristband that fell from Wilt's broken arm. Jordan went on to become a professional basketball star, and while filming an ad in Japan was found by Mac, Bloo, Frankie, Coco, Eduardo, Nina Valarosa, and the scientists who researched Coco (Douglas and Adam), who looked for him after Wilt left to take on Foul Larry. The two were reunited, and Wilt promised to visit Jordan whenever he wanted. Wilt, however, could still be adopted.

Full name: Wilt Michaels Species: Imaginary Friend Gender: Male ♂ Age: at least 31 Birthday: 1973 Like(s): Basketball, Apologizing, Helping others Dislike(s): Mean People, Lying, Bloo's selfishness, Duchess (but is sorry) Personality Wilt is kind-hearted, friendly, cool, helpful, lighthearted, honest and incredibly nice. He remains optimistic and confident despite his troubled past. He's also known for frequently apologizing, often starting his sentences with “I’m sorry, but…” and ending them with “Is that okay?” even when there’s no real reason to apologize.

Physical Appearance Wilt has red skin and stitches on his left arm and his face sides. His left eyestalk is crooked making him blind in one eye, while his right one is fine. His right arm is normal, however his left arm is a short stump that he can move regardless. He also has two long legs, for a total of four limbs. He has a number 1 on his chest akin to one on a basketball jersey, a single wristband on his right arm, white long tube socks with red and blue stripes on the cuffs, as well as black and white basketball sneakers that make his footsteps squeak like he's on a basketball court when he walks around.

Mac is a bright, selfless, smart, sensible, imaginative young boy who is not afraid to show his emotions, and the creator of Bloo. He created Bloo when he was three years old. Mac is unusually clever, and almost always knows what to do when there is a problem.

He has a keen sense of reason and tends to be the one to settle any mishaps that the imaginary friends (particularly Bloo) end up causing. Mac is usually very good-natured, despite Bloo's continuing antics. No matter what happens to Bloo, or any other member of the house, Mac is usually the one to bail them out.

However, he has been known to snap; Mac has a strong moral personality, and he always avoids doing wrong things but is sometimes pushed to do otherwise, almost always by Bloo. That said, he can be very rambunctious and childish when he wants to be, and generally has no problem pulling pranks or messing around with Bloo, as long as nobody gets hurt. Some episodes also have him being more naïve and childlike than usual, like "Adoptcalypse Now" or "Fools and Regulations".

Species: Human Gender: Male ♂ Age: 8 Birthday: May 3rd, 1996 Like(s):Bloo, Frankie, Imaginary friends, Sugary sweets (only when in sugar rush mode), Video games, Having fun with his friends, Helping imaginary friends find good homes, Helping people with problems, Spending time with his friends, His blanket when he was a child, Doing martial arts, Driving cars and bikes Dislike(s):Terrence, Trouble, Stupidity, Bloo getting in trouble, Jail, Bloo acting like an idiot, Getting abused, His friends in danger, Bloo's get-rich quick schemes, Being called Ditchy McAbandonpants, losing his blanket when he was a child, Being a kid, His vehicles being destroyed, Surprise parties Appearance Mac is an 8-year-old boy with long brown hair, brown eyes and tan skin. His head is in the shape of a rounded cube and his body an isosceles triangle. He wears a red T-shirt with a white sweater underneath, a dark green backpack on his back, tan khakis, and black tennis shoes with white stripes.

When he goes to bed, he wears blue pajamas with a button-up top.

Mac's winter outfit consists of a red hoodie and beanie with white trimming on the front.

Mac's outfit when it's raining outside consists of a burgundy hoodie.

Bloo is a selfish, cunning, and immature character. In Season 1, he was softer, but by Season 2, he had become mean, greedy, jealous, and manipulative. He's a rebel, often breaking rules and causing trouble. In "Camp Keep a Good Mac Down," he put everyone in danger by eating all the food. However, in "Read 'Em and Weep," he genuinely cries when he thinks his friend Eduardo has died. In "The Sweet Stench of Success," he misses Mac and his friends. Although Bloo usually hides his caring side, he occasionally does good deeds—for example, helping One-Eyed Cat find his family.

Bloo often makes mistakes, but corrects them when his friends point them out. He loves paddleball, although he almost never hits the ball, but is an excellent bowler. He's also a skilled sewer: in "Say It Isn't Sew," he creates a giant blanket, and in "Land of the Flea," a fur coat from Eduardo's wool.

Blue is lazy (instead of picking up a chip from the floor, he looks for someone else), talkative, and incapable of keeping quiet. He doesn't hate rules, but he's incapable of following them—especially those imposed by Mr. Herriman. Despite his selfishness, Blue almost never abandons Mac: in "Nightmare on Wilson Way," he returns to a zombie-infested house to save his friend. Exceptions are rare (like with Berry). Overall, Blue rarely learns from his mistakes, and as the series progresses, his misdeeds escalate, from theft to illegal use of a loudspeaker at the observatory and his arrest.

Full name: Blooregard Q. Kazoo Species: Imaginary Friend Gender:Male ♂ Age:5 Birthday: 1999 Like(s):Paddle ball, Video games, Watching TV, Spending time with Mac, Goo coming to visit, Getting in trouble, Wild parties, Pulling pranks, Being mean (sometimes), Amusement parks, Waterslides, Racecar beds, Anything fun, Collecting Coco Cards, Action movies starting Rod Tango, Making money, Paintball, Eating good food Dislike(s):Being bored, Apologizing (sometimes), Being nice (sometimes), Frankie's anger, Rules, Losing, Being, threatened, Terrence bullying him and Mac, Getting punished by Mr. Herriman, Not having his way, Cheese (sometimes), Mac being in danger. Mac created Bloo when he was three years old, meaning that, by the start of the series, they had been creator and creation for five years. According to a trading card in the Foster's Home for Imaginary Friends Leapster game, Mac created him when he had to give away his favorite blanket. Appearance Bloo is a blue-colored, dome-like cylindrical creature. He has round eyes, curvy arms, a little mouth, and stubby, fingerless hands. He is exactly 2 feet tall, and weighs 10 pounds when dry. When he walks, he makes squeaking sounds akin to that of a shoe.

Bloo's winter outfit consists of a red-violet scarf and a brown trapper hat with warm brown in the front.

Bloo's outfit when it's raining outside consists of a squash beanie with orange in the bottom, and a orange scarf.

Extremeasaurs are a dangerous breed of imaginary friends who, according to Wilt, are created mainly by delinquent teenagers with a taste for destruction. Description Most of the Extremeasaurs have the grotesque appearance of monsters, or in rare cases, are very innocent and harmless looking, like the Extremeasaur Champion seen in "Eddie Monster." They are exceedingly taller than Wilt in most cases. Size does not deter the fact that these monsters are extremely dangerous; even the smallest of ones can be deadly, which is what explains the reason that they are kept within confinement.

They have such great power, fearsome looks, and almost no intelligence whatsoever because they are fighting machines. Despite that, there was one Extremeasaur which wasn't even strong enough to take a punch to the face, meaning Extremeasaurs have certain weaknesses, which Eduardo kept accidentally exploiting. Some weaknesses are that they are made of metal, and when Eduardo weeped, the monster turned to rust.

Due to the fantastical nature of imaginary friends, their biology differs significantly from that of humans, with the possible exception of some humanoid imaginary friends. They can be anthropomorphic objects, including food or something from a fantasy book. However, most of them need to eat. In "Dinner Cancelled," a giant turkey mentions not eating because it would kill its kind, but in "Read and Weep," a food imaginary friend named Sam Burger mentions being hungry and having to eat coconuts when stranded on a desert island to survive. In "Let Your Bunny Down," Eduardo tells Frankie that he had to eat chairs for three weeks, demonstrating that imaginary friends' stomachs can digest objects that humans would otherwise die trying to eat. Furthermore, imaginary friends seem more flexible and, thanks to their cartoonish bodies, can stretch in different directions or experience much more pain than most humans. However, they are capable of dying, as demonstrated by the food friends, who will die if completely eaten.

Despite their biological needs, imaginary friends do not age like humans; they remain the same "age" as when they were first created. The only way they can die naturally is when they are completely forgotten, as stated by Duchess in "House of Blue" and by their creator himself. They also cannot reproduce.

The episode "Bloooo" shows that humans and imaginary friends can contract the same illnesses, as seen when Mac and Bloooo contracted a cold or flu. When Bloooo contracted the illness, he turned pale, became delirious, developed a stuffy nose, and moaned frequently.

Imaginary friends also require sleep, as demonstrated in the episode "The Sweet Stench of Success." They also need to use the restroom, as shown in the episode "Revealed."

They can be humanoid, human-like, animal-like, or anthropomorphic objects (including food), and seem limited in shape and size only by the imagination of their creators. Most non-human-like imaginary friends are nude.

Imaginary friends are beings which are the result of cognitive manifestation from a child's mind. They can come in all shapes and sizes; ranging from something completely made up to something based on a particular object, animal, human, place, or thing. In the Foster's universe, these creatures live all over the world.

Creation Imaginary friends are created through the imagination of a child who desires a friend. Imaginary friends can come in all shapes, sizes, species, etc. and their creation and form don't seem to be limited by anything -- so long as the child can think it, it can happen. It seems as though only humans can create them as imaginary friends don't seem to be able to create imaginary friends.

The fact that imaginary friend creation is not as simple as it seems is further proven when Bloo goes to Mac's school's show and tell and impresses the kids so much that they try to imagine an imaginary friend like Bloo. However, none of the imaginary friends match Bloo in appearance (except one) or personality. This could be because it seemed most of the imaginary friends take some sort of physical trait based off their creator's own appearance or personality. It could also be because imagining an imaginary friend based on an already existing imaginary friend is difficult or impossible or that the process of imagining an imaginary friend is simply more of an occurrence that just happens rather than something that can be controlled. Imaginary friends can also be created by accident as shown with Goo in a few episodes and implied by the Scribbles (the first imaginary friends created by babies) due to there being hundreds of them.

Wilt reveals that there are also imaginary friends who are "unimaginative". Since not all children are very creative, there are those who simply copy from what they see on television i.e. in Foster's, there is an imaginary friend who is copied off of Mojo Jojo from The Powerpuff Girls.

Foster's Home for Imaginary Friends (located at 1123 Wilson Way in an unnamed town in the Pacific Northwest region of the United States[1]) is the titular mansion where many imaginary friends live in until they are adopted again by new children. As stated in the pilot movie "House of Bloo's", it was originally Madame Foster's own house, until she opened it up as a place for homeless imaginary friends to stay. Architecture and Layout Probably the most unique building in the neighborhood, the mansion can easily be spotted, passing through the Gothic gate with "Foster" decorating the upper arc, with a massive willow tree taller than the house itself in the garden, Foster's Home for Imaginary Friends is a very tall Victorian building painted in many shades of dark purple and blue, with tall windows, balconies, and three visible chimneys, two of them tied together. Decorating the very top is a long flag with the Foster's seal on it. Inside, the mansion is as random and different as it is outside, being very colorful and almost childlike in design, yet at the same time quite regal and Victorian. With big chandeliers, tall staircases, pillars and expensive decoration (including a collection of Madame Foster busts to replace any broken bust in the house). The halls are lined with colorful doors, most of them leading to the rooms where the imaginary friends sleep. The doors don't all quite match, greatly varying in size and shape. The rooms themselves, however, have relatively similar design and furniture, with a few variations. As stated by Madame Foster in "House of Bloo's" and as demonstrated in "Dinner is Swerved", it's fairly easy to get lost inside the confusing halls of Foster's. The mansion also has several trapdoors and secret passages. The mansion has at least six floors and can house up to around 2,000 imaginary friends.

In the Foster's Home for Imaginary Friends universe, imaginary friends (or "friends" for short) become physical beings the instant a child |imagines them; unlike how the concept often works on other shows, an imaginary friend takes physical and emotional form after a child creates specific details about that character. Unfortunately for them, the children eventually outgrow them around ages 7–8. When this happens, the friends are left to fend for themselves. Foster's Home for Imaginary Friends was founded by the elderly Madame Foster to provide a foster home for abandoned imaginary friends.

There are (according to "Setting a President") 1,340 imaginary friends in Foster's; however, at the end of "Emancipation Complication," Madame Foster states that there are 2,038 imaginary friends currently residing in the house, plus Bloo and Mr. Herriman, Madame Foster's imaginary friend whom she never outgrew. The house motto is "Where good ideas are not forgotten."