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The Imaginary Friends were all humans in a previous life, and the children that imagine them bring about their reincarnations as Imaginary Friends

Bloo: A Con Man that died during a prison riot.Eduardo: Had been a cowardly spanish bull fighter who died thanks to a bull.Wilt: An Athlete killed when a stadium was blown up in a terrorist bombing.Coco: An Airplane pilot, who named her Airplane Coco, she ended up blown up when the plane was destroyed.Duchess: A self centered, snobbish, high class member, who ended up killed by her own Greed.Cheese: A Cheesemaker killed during an accident at a cheese factory.Berry: A serial killer who had been in the same cell as Bloo prior to his death, she ended up gaining a crush on him, she died in the exact same prison riot that Bloo died in.

  • Coco's would explain her fear of flying.
  • Or perhaps Duchess could have been an aristocrat in 18th century socialist France.

Terrence has a nice side.
In "Fools and Regulations", Mac shows up with a bag, not a couple, a BAG, of video games from Terrence due to a deal Mac made with him about not telling their mother about the fire the elder brother started in the house. Mac then giggles while saying "Can you believe he did that? Hehe!", so that shows that they must have fun once in a while.

More evidence surfaces in "Eddie Monster". Terrence complimented Ed on more than one occasion, saying that he was "perfect", and in his own way, he called him brave. He also made Eduardo a costume and got a huge sack of potatoes for him; he even peeled them. Granted that was for his own advantage, but generous acts nonetheless.

In "Seeing Red", Terrence actually showed pride and mild affection for Red, the imaginary friend he created, and only started treating him badly when he messed his scheme up and completely disobeyed his orders, rather blatantly in fact.

Oh, and how can we forget the moment in "Berry Scary" when we caught the so-called jerkass was watching a lovey-dovey soap opera? With intense focus, I might add! He was even gripping a pillow. That's not something a 100% teenage jerk does, now is it?


The Powerpuff Girls takes place on the same world as Foster's Home for Imaginary Friends and Adventure Time (but not at the same time)
  • The girls protect Townsville from gigantic beasts that could have come from the Mushroom War in Adventure Time. They might be the ones standing between Townsville becoming an inhabitable wasteland.
  • This also explains why the Mayor is still in office despite his incompetence.
  • The other cities shown in The Powerpuff Girls are actually city-states that have their own methods for defending themselves.
  • Chemical X may have been caused by the Mushroom War as well.
  • Both Mike, the Powerpuff girls, and Finn and Jake were all able to change reality through their imagination. Their abilities could also have been caused by the nuclear fall-out, as could the ability of people to create imaginary friends in Foster's Home.
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  • We never see the imaginary friends of adults except for Madame Foster in Foster's Home for Imaginary Friends , but we do see that teenagers create dangerous creatures they use to attack each other. The adults may be using their friends to protect the town so they can go about their business as usual and pretend that life has not drastically changed.
  • To finish up the theory, it isn't the terrifying monsters that finished off the city-states. It's the rainicorns, who humanity could not believe was evil. That was why the dogs went to war with them, because they were trying to protect their best friends.

Literally Everyone in the Fosters universe is "Mad" in the Wonderland sense
This is probably already addressed in the Fosters It Just Bugs me page but nearly all of the imaginary friends appear totally to be the opposite of anything any Real Life child would ever want. Instead of being cool, fun, and nice their Boreish, excessively nonsensical, totally anti-social and at times cruel. The only possible explanation for all of this is that nearly everyone that exists in the fosters universe is clinically insane but in the same way as characters in Alice in Wonderland are insane. as all of their thoughts and dreams appear to come true.

The only reason that no one is given genuine psychiatric treatment is that by their own logic a truly insane person imagines things, persons and events that dont really exist, but since everyones personal physical thoughts and dreams can be physically seen and interacted with/by others no one is declared mentally ill. It does explain why Madame Foster, Mac and numerous other human characters imagined their friends to act the way they do.

  • Or all these imaginaries act the way they do because they feel a sense of abandonment and are acting out. It's also entirely possible that some of the young children who would need an imaginary friend wouldn't be so kind towards others, so it would make sense for an imaginary to be rather anti-social and cruel to others who aren't their kid. It's possible they were specifically designed to be kind to their kid and be judgemental towards everybody else. Maybe even a combination of both of these; these imaginaries were very close to their kids but then they felt abandoned and became jaded, while feeling no particular sympathy for anybody else.
  • Some kids create imaginary friends to use as a scapegoat. You know, if their parents ask if they did something bad, the kids claim their imaginary friend did it. And when they realize Mom and Dad ain't buying it, they abandon their imaginary friend.

Mac will take over Foster's.
Remember in the first episode when Madame Foster said Mac had an imagination as pure as her own? She didn't give up on her imaginary friend, and Mac probably won't either. Madame won't live forever, and there will always be friends in need. She might even will the house to Mac.
  • The alternative would be Frankie, who is/was likely Madam Foster's heir. Though it's hard to say if Frankie actually wants to run Fosters or would even object to Mac getting the spot.

90% of the show was made up by World (as an alternative to Mac's theory)
World wasn't dumped at Foster's; he made up Foster's so that his "dream friend" (Frankie) would open the chest and have the events of Destination Imagination unfold. To add a little more drama, he made up "dream enemies" (Mac, Bloo, Wilt, Eduardo and Coco) so that he wouldn't get bored. He is technically the only sentient creature besides Frankie (remember, he controlled all of the Foster's Five's so-called allies while trying to get Frankie back).

90% of the show is made up by Mac
The Imaginary Friends were never as real as they seem to us. Mac just kept telling himself this to give himself a reason to keep his own Imaginary Friend. Mac doesn't seem to have a lot of human friends, and his family.... You get the idea. His imagination was pretty much all he ever had to keep him company. When his mother forced him to give up Bloo, he invented Foster's Home so he could keep playing with him.

In reality, Frankie, Madam Foster, Goo, and that one girl next door are the only other characters from the show who exist outside of Mac's imagination. Frankie is just a regular granddaughter who takes care of her old grandmother. The two women probably noticed how much Terrance bullied his little brother and tried to make Mac feel better by making friends with him. Mac then simply placed Foster's Home in the Foster's mansion and claimed to himself that he was going to visit Bloo every afternoon at 3 o'clock when he really was visiting Frankie and playing with her.

  • The image of Frankie as the "house-maid" and whole staff of Foster's stems from her being the only one around to care about her 80-year-old grandmother, which is not exactly a piece of cake.
  • Mac's "dream-world" hasn't been destroyed yet because Frankie and Madam Foster ENCOURAGE him to keep making up creative stories. The speech about "pure Imagination" that Madam Foster gives in the pilot was probably one of the few moments that Mac didn't make up.
  • Madam Foster is collecting stuffed dolls, and she allows Mac to play with them. He simply made up a character and some backstory for each of them. This makes sense with Wilt being the one to have stayed in Foster's the longest and being damaged: He's probably rather old. Eduardo is one of those Monster dolls with the inappropriate smiling faces. Coco was probably hand-sewn by some child and turned out downright weird. Maybe Madam Foster is also telling Mac stories involving the dolls from time to time, particularly Mr. Harriman. Just imagine the old Lady holding a stuffed bunny and saying, "And do you want to know what my Funny Bunny used to play with me, when I was a little girl?"
  • Goo is exactly what she is in the series: a hyperactive, creative little girl. She's probably playing along with Mac's "Foster's Home"-Games because making things up is her specialty as well. The She Is Not My Girlfriend moments stem from this: Mac is Not So Different from Goo. He just keeps denying it because she scares him a bit.
  • Bloo's Flanderization to a complete Jerkass is happening because Mac is starting to realize that he can't keep playing with a childish fantasy for the rest of his life. He is subconsciously making Bloo less likeable to make it easier to leave him. However, he isn't ready to let go of him yet, which is why Bloo has still some Jerk with a Heart of Gold moments. Mac doesn't want to hate him.
    • Mac is rather mature for his age, while Bloo is his immature side lashing out at him for becoming responsible, out of fear that he won't come back. Bloo is both helping Mac grow up by becoming something unlikable, and subconsciously attempting to keep him close by being domineering in such a way that ensures Mac can't just walk away from him.
  • The sugar-craze is because Mac is allergic to sugar and also gets hyper off it. He's just exaggerating this condition in his fantasies.
    • Not allergic, but diabetic, which would make things even worse for the kid.
  • References to popular media are Mac integrating something he likes into his games and fantasies.
  • Another reason that Mac may have came up with 90% of the show - Craig McCracken said at Comic-Con that Mac and Terrence's father divorced their mother. Bloo might've been "created" as a psychological shield for Mac to get over this event.
  • There's a fan art piece that shows a variation of this sort of theory, depicting it as a "final episode". The twist is that it's Frankie doing the imagining. It also made her as an autistic kid staring at a snowglobe with the Foster's home in it. Wow, what a downer.

Pranks for Nothing takes place at Mac had left fosters in Goodbye To Bloo
The Reason was Mac was not seen or mentioned in the episode.

90% of the show is made up by Mac and Mac is an old man in an old folks' home
The entire show is Mac's imagination. Mac is an old man with Alzheimer's who lives in a retirement home called Foster's. All of the imaginary friends are projections of his old friends and the more prominent imaginary friends are his family members and fellow inmates. This is the truth and it is sad.

Mac originally made Bloo to cope with his life, but started imagining Foster's after being hospitalized for a cracked skull Terrence gave him for talking about the imaginary friend one too many times.
The events of the first movie happened while he was still on painkillers in the hospital as Terrence told him horror stories about killing his imaginary friend. The half-senile lady who shared the room and her granddaughter/caretaker felt sorry for him and tried to help him with stories about Eduardo (a stuffed animal), Wilt (a line-of-sight character Frankie made up from the muted television) and Coco (a potted plant) helping him rescue Bloo, and then offered to take care of him in the afternoons for his mom while Terrence was in juvenile hall for causing the "accident." They just kept up the schedule after he got out, but let him start visiting of Saturdays, too (the adopt-a-friend-a-thon episode, where Mac tried to go to the Fosters' on his own and got lost at a weekly flea market near their house). The second movie, with Wilt, had him running away, but he was hit by a car; and the rest of it was a mish-mash of his own plans, Frankie trying to get through to him by talking about how much the Friends missed him, and the other guy in the room - a kid who was in the hospital for getting landed on in a particularly brutal game of basketball.

The Episode "Berry Scary" is a Take That! against Sonic/Amy shippers
  • Bloo being Sonic and Berry being Amy, of course.

The Bloo in later series is not the same Bloo as in earlier series.
It's one of the hundreds of Bloos the kids at Mac's school imagined that has taken the place of the real Bloo. That's why Bloo is becoming a Jerkass; he's a fake whose attempts at imitating the real Bloo are crumbling. Meanwhile, the real Bloo is stuck with that ice skating troupe.

The reason Mac hasn't noticed? Because fake Bloo learned to do a good job.

  • Adding to this, the real one was the one that have the heartfelt friendship speech when it came down to between him and the fake. Mac didn't realize Bloo's Heart of Gold was bigger than he thought so he didn't realize that only the real Bloo would have cared that much.

Bloo is Mac's Shugo Chara!
Not as in "He came from an egg", but as in "He's his would-be self/ The self he wants to be". Mac made Bloo up as a clever egoist because, deep inside, he wishes to be a clever egoist himself.

Why? Well, usually, it seems like their personalities were complete opposites. But we often get to see that Mac's "nice boy" personality brings him a lot of disadvantages, like in the Race-episode. Since Bloo always just does what he wants, he never has to deal with the problems that Mac has to deal with and tends to get what he desires much more often (even if that means that he's also in trouble a lot more often). And he's not sensible or allergic to sugar, like Mac is.

Also, a Shugo Chara/Would-Be Self does NOT have just positive qualities and may sometimes even bother the owner a lot, as seen with Tadase and Kiseki; Ikuto and Yoru; and even Amu and Ran. This is also true for Mac and Bloo; in fact, they are like Tadase and Kiseki (a nice boy and the king of egoism).

Every imaginary friend is/was/will be someone's Shugo Chara!/would-be self
For example, Officer Nina created Eduardo (as seen in The Movie) because she wanted an imaginary friend who could protect her. When she grew up and became a policewoman, she already knew who she wanted to be—someone who could protect others—so she didn't need Eduardo any longer. There's also Wilt's creator, a professional basketballer.

Then there's Goo, who was lonely and wanted to be more popular so she could have more friends. She created thousands of would-be selves because they were all more interesting than her true self. Not to mention an episode with a blind kid who had an imaginary friend with hundreds of eyes, and the episode where it showed teenagers' imaginary friends were destructive monsters...

Madame Foster probably came across children who couldn't find their would-be self and were lost and miserable because they didn't know who they truly were, as well as abandoned imaginary friends, so she established Fosters' Home, to help others find their paths. (Alternatively, Fosters' Home is this universe's Heart Cradle.) This also explains why Frankie doesn't have an imaginary friend of her own: she knows that she is going to help other children find their would-be selves, so she doesn't need one herself.

  • That makes so much sense.
  • Somewhat confirmed. It's stated that Imaginary Friends are what the person needs. So they do help them reach their potential.* * and World is an example gone wrong of what his kid would have become if he had been neglected by his parents. He has a giant castle, but he doesn't have friends

Inversly, they are what their creators don't want to be.
Bloo is a Jerkass; Mac is a nice guy. Wilt is constantly apologetic; Jordan Michaels is strong and assertive. Mister Herriman is a strict workaholic; Madame Foster is free spirited.
  • Note one point we meet one who was designed to be a bowling buddy, who was basically a bowling suit with a pin for a head, and was TERRIBLE at the game.
  • Then what kind of cruel person imagined Uncle Pockets?
Bloo is Mac's Id personality
This means that Bloo is basically Mac without a conscience.

This theory has been popular for a while and is even mentioned in the Foster's Wiki. Bloo completely fits into this part of Freud's model of personality, except that he rarely displays sexual lust... Then again, he does in Frankie My Dear.

  • Justified by the fact that Mac is 8, and so he hasn't hit puberty yet.

Long after Mac gives up on Bloo, Foster's, and imaginary friends as childish things that don't belong in the real world, some vestiges of Bloo still remain and eventually re-manifest themselves as Tyler Durden - mostly because no adult would have a shapeless blue... thingy named Bloo as an imaginary friend, even if they didn't know he was imaginary. This works scarily well.

Mac's sugar rushes are some of the suppressed parts of his personality emerging
Every kid gets a bit hyper when eating too much sugar, but Mac clearly has some suppressed energies that just explode out of him once the barricades open up. Growing up with a Missing Mom, who tried to convince him to be a "big boy" whenever she was not Missing, a completely Disappeared Dad, and an Evil Big Brother, Mac eventually learned that it's better to keep your mouth shut as much as possible if you don't want to get into trouble with bullies, neighbours, strangers on the streets, and the like. Also, being a nice boy gave him a higher score with his Mom to make her pay attention to him at least a little bit more. Therefore, he had to suppress anything selfish, wild, and childish within him. These suppressed parts manifested in two ways: First, the creation of Bloo, who is selfish and childish, but cute; and second, his Sugar Rush Mushroom Samba Persona, which is wild and unstoppable and doesn't care about anyone or anything, save sugar.

90% of the show was made up by Madame Foster.
Frankie's her caretaker, and the Friends are her cats. Goo was a stray cat that had a lot of kittens at the house, and Mac was one of Frankie's suitors.
  • That's.... depressing... and... dark.
  • Mac is too young to be a suitor of Frankie's.
    • Every guy under 30 is a cute little kid to Madame Foster.

Bloo just wants to be loved
His greatest fear is to be left alone. That's why he plays the Attention Whore so much that he's a Jerkass. He wants the others to think he's cool, awesome, AND cute because he thinks he won't be accepted otherwise, but rejected as "boring". He doesn't care about money or fame at all; he only cares about having people around him who like him. It backfires, but, well...
  • He thinks that if nobody's there to imagine him, he'll die.
    • Then why isn't Coco dead yet? You can't tell me those nerds are keeping her alive!
      • Bloo believes he will. Doesn't mean it's true.

Imaginary Friends can battle for the order of the Universe, and Bloo could be the savior of the universe
And only Madame Foster noticed how he was pure and interesting - in imagination matters, that is, and probably in power. It could explain how he doesn't get troubled by half of the things he does (and gets off lightly for the other half). He might have some sort of destiny warping or even mind control he doesn't know how to use.

Also, the teenager imagination monsters could be powerful enemies if there was an imaginative and sufficiently horrible teen to make a powerful enough monster... Mac's brother could do it if power of imagination is genetic - he's kinda evil - but he's also as dumb as a door.

  • Imaginative and sufficiently horrible, eh? Foster's is lucky that Sid Phillips doesn't live in their world, then. Non-living toys means that he would likely have remained the way the first movie portrayed him. Add that to his status as a pseudo-Shadow Archetype to Andy...
  • Perhaps imaginary friends will be used in an all-out World War by someone enslaving children to try and take control of the Earth.
  • Goo will be classified as a Weapon of Mass Destruction.
  • A reality-warping power (s)he doesn't know about...!!! You mean Bloo's Haruhi?!

Mac and Goo both have Asperger's Syndrome.
It makes sense. Take a look at Mac first: Intelligent, large vocabulary, afraid of changes, has problems finding friends in a normal social environment, but does easily find some in a place that's aloft of normality. And he's often bullied. (By his older brother, but still...) Also, he's been stated to be exceptionally creative. He also tends to become extremely nervous if something doesn't go as planned or if an important routine is broken. Another evidence are his sugar rushes: His neuronal-system seems to react differently to the sudden energy-burst than it should, which is a sign of changed brain-chemicals—> Autism. Following the "Bloo is Mac without a conscience"-theory gives us another hint: Bloo's total lack of empathy. Empathy can, to some degree, be learned; Mac has learned it, while Bloo hasn't.

Let's move on to Goo: In her case, it's probably Asperger's mixed with ADHD (yes, that DOES happen). Like Mac, she's pretty intelligent and creative; but she's also very fast talking, does not seem to notice when others fail to follow her words, has a strange way of walking, does not follow the "unwritten rules of society" (like "following a person around all the time is bad" or "showing up uninvited is impolite"), and has explicitly been stated to have no friends because she's "weird". Also, Goo herself says that she knows that she's weird, or "different", a feeling that most autistic children have.

  • This makes a dangerous amount of sense. Madame Foster may also have it.
  • I don't know. I can kind of maybe see High-Functioning Autism in Mac (mostly in the sugar thing), but Goo to me seems more like she was never taught about social norms or behaviors. In the show, her parents have a really hands-off approach to raising her, even letting her pick out her own name when she was a baby, so it would make sense if her parents just never told her things like, "You're talking too fast, you're creeping out the nice boy, please calm down, etc."

Mac will grow up to become Kira.
His first victim will be an already grown-up (and away from home) Terrance, and his mother will marry again and have a girl. What? He already does look like Light.

Wilt will be Kira, and Mac will be the Asperger's-afflicted detective who opposes him.
Light started out wanting to make the world better, and it's been shown that Wilt can be pretty freaking evil when he snaps (though it's never stuck yet). That, combined with the above two guesses, resulted in this guess. Coco is the shinigami, and not a Friend at all. Coco shredded her Death Note to particulate matter so that anyone who entered the Home could see her, which is why she existed at least since the nerds-who-don't-believe-in-imaginary-friends found her.
  • Alternatively, Calvin will become Kira, and Mac will be L. You have to admit, it would be pretty cool to have the two become mortal enemies and oppose each other.

Madame Foster used to be like Goo, with the overactive Imaginary Friend creation.
That's why she started the home. Harriman was the only imaginary friend that really had its own personality, and was her best friend (real or imaginary), so she kept him.

Goofball has mind control powers.
However, they only work on other Imaginary Friends, so he couldn't keep Frankie from realizing what a jerk he really was. But by using his powers to make everyone else in the house think he was a great guy, he managed to get them on his side.

Foster's is actually a storage facility for government experiments.
The government has been creating creatures in an attempt to make a super weapon. To keep this a secret, the government teleports the "imaginary" friends to children's room after using floride toothpaste and drinking water to subtly affect their imagination. Then they instituted Foster's as a storage facility for the friends after the child got bored. The most dangerous creations get put off as teenagers' friends. The friends also get false memories implanted. All the technology needed for this operation was reverse engineered off of Megatron.

The episodes are not shown in the chronologically correct order.
That is to say, the very first and the very last episode really does show what happened first and last. But the episodes in between were often shown out of order. Proof of this is that in some episodes, Frankie seems to be weilding more authority - In "Adoptcalypse Now", "Go Goo Go" and "Better Off Ed" for instance, she's acting more like Mr. Herriman's deputy manager than like a subordinate housekeeper. Think about - in "Better Off Ed", Mr. Herriman and Frankie attend a home improvement seminar together; The old Mr. Herriman would've gone alone and told Frankie that doing chores is a better use of her time.

The big turning point was of course in "Destination Imagination", where Mr. Herriman finally learns to listen to Frankie and respect her. This would also mean that Goo didn't make her debut until after "Destination Imagination", which explains why she wasn't in this episode even though the rest of the gang was. Other episodes where you'd think it would be natural for Goo would be present - "Good Wilt Hunting", for instance - might also have taken place before "Go Goo Go".

Terrence created Duchess.
Think about it. They're both conniving, evil, among other things, maybe Terrence created Duchess, but he then forgot about it? Terrence does have a very bad memory.
  • I dunno, Terrence doesn't strike me as the type to have been cultured enough to create such a spoilt brat. And Duchess would have remembered.
    • Not to mention Terrence is too stupid to come up with anything more than a red box, or pizza.
Duchess is one of the oldest friends at the house, and has been there since Madame Foster had just recently started it up. Terrence is unlikely to be her creator.

The other Imaginary Friends were created by...
  • Duchess: A Spoiled Brat of a child with artistic aspirations (see Small Name, Big Ego). After putting up with Duchess for five minutes, they may have realized how unpleasant they are to other people.

Rainbow is in the same universe as Foster's
Well, the shows are somewhat similar. Both revolve around a greedy, self-centered blob (Zippy/Bloo), a timid, worrisome creature who likes toys (George/Eduardo), a tall, well-meaning character (Bungle/Wilt) and their friendly but easily annoyed human caretaker (Geoffrey/Frankie).

Anyway, in Rainbow, Zippy, George and Bungle are really imaginary friends. They're either Geoffrey's imaginary friends that he didn't want to let go of, or Geoffrey runs a British version of Foster's that isn't as successful.

In the Foster's universe, Imaginary Friends are a social minority
They're treated like pets even though most of them are intelligent and pretty much on the same level as humans. Plus, in Setting A President, we see that some businesses don't allow imaginary friends to work there.
  • While in "Emancipation Complication", we see that using imaginary friends for what is essentially slave labor, is considered acceptable.

They're all vampires.
And everybody knows vampires don't show up in pictures...

Mac loves Frankie. Nothing on her side.
Its kind of hinted at in the show as its a kids program. There's even an episode where Frankie goes on a date with a guy her age and Mac gets jealous.
  • This is pretty well established in the show. One episode includes Bloo daring Mac to tell Frankie that he loves her.

Foster's Home itself is an alternate universe parallel to Thorney Towers.

...Just an impulse, really. Then again, it could even be Thorney Towers itself from a patient's (Mac's?) exaggerated point of view. In Psychonauts Fred is often called a pushover, Gloria has a tendency to not make much clear sense, Edgar is a Gentle Giant who is (generally) more avoidant than confrontational...

Coco is a Pokémon or some variant thereof.
  • Would explain how she conquered Japan so easily...
  • And the fact that she seems to have powers that even the other imaginary friends seem to lack.

The Madame Foster seen for at least part of the series is Frankie's imaginary friend.
There was a real Madame Foster, of course — she dreamed up Funny Bunny Mr. Herriman, founded Fosters, and raised Frankie. However, people don't live forever... When she passed away, Frankie went into a Heroic BSoD before imagining that her grandmother was still alive, creating the Madame we see in the series. This is why Herriman seems to be completely in charge of the house at first, and part of why he's so hard on 'Miss Frances' — not only does he feel she's not ready to follow in her grandmother's footsteps, but she's responsible for his having to cope with an imitation of his creator. He doesn't inform the imaginary Madame of this because, on some level, he's not ready to let go either, and seeing how thoroughly the news might hurt her... Well, he just can't bring himself to do that.

Foster's is a book series created by an adult Mac.
Mac managed to mature during the years but didn't lose his imagination, so he decided to re-shape his past adding the imaginary friends. Of course he could have kept some things like they were, such as Terrance's bullying, but he added Bloo and the others. Madame Foster could be a old lady he is friends with and Frankie could be his childhood crush and Madame's granddaughter. Goo could be a friend of Mac. The man could have become mildly social with the years, and decided to make a colorful story of that process.

Frankie is an imaginary friend created by Madame Foster.
This is why Frankie's parents are never mentioned, Frankie rarely leaves Foster's, and she doesn't have an imaginary friend of her own except for the scribbles. (Which would mean the scribbles were locked up, not because they were created by a baby, but because they were created by another imaginary friend.) Madame Foster just wanted kids, and since there isn't any mention of a "Mr. Foster", she decided to create Frankie.
  • I hate the word jossed so I won't use it but this was disproved by the memory of her as a child imagining the scribbles.
    Imaginary friends don't age.
  • Maybe she was imagined to age? If this was true, this could put the episode with Goofball in an even sadder light. If Frankie really was an imaginary friend, but nobody believed her when she told them because she looked "too human" or was raised to think that she was human and deny her imaginary friendness, no wonder she went absolutely nuts when she saw the extremely human-looking imaginary friend Goofball. She wouldn't just be pissed because Goofball was a total slob who looked as if he just showed up to take advantage of the hospitality, but she would also be pissed because Goofball was living the life she was denied for looking "too human" and would think that either she should have the life Goofball has (thus, the Goof-Goof charade) or that Goofball should have a life like hers (thus the outburst at the end where she rips his fake nose off while screaming that he's not an imaginary friend).

Alternatively, Madame Foster is an imaginary friend created by Frankie.
The real Madame Foster died, and Frankie imagined a new version of Madame Foster, which explains why Madame Foster is so energetic and childlike.

Frankie's parents were killed by...

Foster's Home is located in a suburb of Townsville.
The monsters the Powerpuff Girls fight are actually Extremeosauri, and when they are defeated, the Foster's crew goes and picks them up to put them in one of their big metal boxes and take care of them. There's Powerpuff Girls merch scattered all around the canon, including Frankie's shirt, because they are real superheroes. The imaginary Mojo Jojo from the pilot was made up when his kid was watching the news, not cartoon. Don't believe me? Well, there WAS a PPG episode where a kid's imaginary friend was real...
  • This theory's further supported by Mac and Bloo's cameo in the PPG Rule special.
    • Although, were all the imaginary friends in PPG? You would think at least bubbles would come up with one.
      • All the monsters the PPG fight are some kind of imaginary friend.

Imaginary Friends don't have full rights in this universe
Let's review, adopting fully mature (and often VERY old) sentient beings without consent of said being is both very common, and considered a GOOD thing. The inverse of that, dumping a young one from the house is also just as normal as well. Terrance once made up a pizza one, and not with a second thought DEVOURED IT. You rarely see the imaginaries outside of the House with any kind of work, we only see Coca doing a few odd jobs in a Mall for one episode. That suggest that they are very least second class citizens, not really considered human but closer to entertainment for children. It doesn't help that kind of what they are.

Bendy's karma will eventually come because...
At the series finale of Foster's, Cheese has moved into Foster's and at the sound of all the screams from the residence, even Bendy is gonna have a huge nightmare dealing with Cheese. So finally, the Karma Houdini will finally get his Laser-Guided Karma at last. And hopefully, people will finally be relieved Karma hit Bendy very hard.

Foster's is located in Florida.
In the election episode, they use Florida's infamous punch-out ballots, plus there's the whole craziness of the world.
  • I agree, there's more evidence in the Europe episode. Mac says Europe has a super fun land amusement park. Bloo says there's one down the street that takes real money. This is obviously Disney, therefore limits it to Orlando and Anaheim.

The House is very long.
Foster's home only looks bigger on the outside from the sidewalk and street from just one angle. It is a very long house, Madam foster could buy the lots behind her, but not the lots to either sides. It is like the Whinchester house, huge that has totally been finished.

Imaginary Friends are like real people, only society doesn't treat them like they are.
The reason Bloo gets worse and worse throughout the show is because he feels Mac getting further and further away. Early on in the show, he was a nice and adorable friend who was incredibly loyal to Mac. Eventually he couldn't stay with Mac anymore and found a home in Foster's, where Mac would visit every day... He can live it up in this house, he can be comfortable, he can slouch, he can be lazy... But his friend Mac is gone for a large portion of his day and he comes to resent him a bit for it. He's always clamoring for attention because he wants to know that if he can't have Mac's, who he feels is slipping away, he can at least have everyone else's. He's constantly drawing attention to himself because he doesn't want to end up alone. He wants to ensure himself that if Mac were to disappear, which he's expecting to happen, he'll have the love and adoration of everyone else, that he doesn't need Mac. But he fails every time, making him try that much harder. He is always trying to prove himself and his worth, aggrandizing himself and acting better than everyone and above every rule because that seems like exactly the kind of thing a person who society deemed as childish and unworthy of hanging around their best friend would want to convince themselves. Think about that for a moment. Imagine a real young boy being told by society that he is nothing more than a childish and worthless object. His best friend shouldn't be hanging out with him, as it is demeaning to his best friend to even be in his presence. His best friend gets ostracized by society for believing that he's worth being around and staying friends with. The amount of damage to his self-esteem would be monumental. Bloo is the perfect narcissist. He aggrandizes his self-worth, constantly reaffirming that he is great, cool, and awesome, because deep down he is a sad, lonely little boy who is trying to convince himself that he isn't a worthless piece of garbage that deserves to be thrown away. It's not that he doesn't care about Mac, it's obvious in certain moments of kindness in between his jerkass behavior that he does. He just feels he has something to prove, that he doesn't need Mac or anybody else, that he is valuable as a person and doesn't need affirmation from anybody but himself. He's trying his hardest to convince everyone, but mostly himself, personal relationships be damned. He really is a sad, lonely child with abadonment issues and lack of self-worth that no one takes seriously enough to try and help him through therapeutically because he's just an imaginary friend. Who takes imaginary things seriously?

The show takes place in a Universe where the South won the Civil War
At no time in the show do we see an American flag. What we do see, especially in the earlier seasons, is a flag with a blue canton and 3 stripes, red-white-red. This is exactly the 1st Confederate National Flag. How this Alternate History leads to the events of the show has yet to be determined...

Since no part of the show looks stereotypically southern, I'm going with one of the earlier posts and saying that the show takes place in Florida, which will be unique no matter what Universe it is.

Sugar is like crack in this universe, but only to humans.
Both Frankie and Mac have been shown reacting to some sweet substance (cookies and candy, respectively) like it was some kind of stimulant. However, the friends seem to be fine eating sweet things. Perhaps, for whatever reason, the effects of sugar are much greater in this universe (although some people react worse than others, just like Real Life drugs), and the friends are immune due to Bizarre Imaginary Biology.
  • That would put kind of a harsh spin on Bloo basically forcing Mac to eat candy that one time.

The Real Reason Herriman was so very hard on Frankie in Destination: Imagination...
If you recall the season 5 finale, Let Your Hare Down, after Bloo's mellowing Herriman down a bit backfired which caused the Foster home to deteriorate, Frankie and the others did what they could to bring Herriman back to the way it was. But as it showed in the final movie, it worked too well. Herriman was not only back to his usual self, but he pushed Frankie more and more than he should. Yeah, good work, Frankie. Nice work on getting Herriman to belittle you and piss you off in the first place.

If Mac and Calvin met at one point, they would become great friends.
Think about it, both have great imaginations, and both of them already have the same mechanic with Bloo and Hobbes.
In the episode where bloo and mac had to find out why everyone wasn't in the picture the theory bloo said that everyone in fosters were robots is actually true.
Well not the part where he said that an evil overlord came down and zapped them and madame foster replaced them with robot clones in grief. But all the imaginary friends were robots the whole time. Foster's is really a Theme park attraction created by madame foster and frankie and all the imaginary friends are animatronics,or A.I holographs created to entertain people and children. the people we see at fosters are really actors and actresses. (even the kids well some of them.) Foster's is similar to sixflags and disneyworld it was created to entertain families.

Terrance will move to Tokyo and change his name to Kimura
There he will learn Japanese and in his middle age teach classics at a high school. And creep out all the HIGH SCHOOL GIRLS.

The show takes place after the apocalypse and all the humans are the ancestors of the last survivor's imaginary friends.
After a nuclear apocalypse, there was only one survivor left. This survivor had strange mental powers, and out of loneliness he imagined countless humans and animals, and a new, lovely world. But after being alone so long, the survivor assumed that his powers were normal for humans to have so all the humans he imagined had them. The human characters in the show are all descendants of these people.

The House is imaginary.
Madame Foster came up with it when she needed a place to keep all of the imaginary friends. That's why it's riddled with Alien Geometries and can fit all those people.

When Mac has sugar, his Trickster Mode is activated.

Madame Foster (and, by relation, Frankie) is a Time Lady.
The house is her TARDIS, which explains why it is so much bigger on the inside.

The show is a prequel to Blue's Clues.
All of the talking animals and objects are imaginary friends. Steve is Mac all grown up. He ran away from home and created a home of his own because his mom would not let him have imaginary friends in the house. He changed his name to Steve so that it would be hard for his mom to fing him. Bloo became too dickish, so Mac abandoned him, and then Bloo got adopted. Nevertheless, he still created another main blue imaginary friend: the nicer and female dog Blue. He did not give her the ability to speak because he was worried that it would make her as annoying as Bloo. Luckily, that ended up not being the case in Blues Room. When Steve/Mac he goes to college, his brother, who is actually Terrance under the new nickname Joe, takes over, having become a nicer person since the events of Foster's Home For Imaginary Friends.

Imaginary friends change to suit the needs of their kids as they get older.
Basically when the kids grow up, if they keep their friends, they grow up to change into something that they need. The reason it doesn't come up is that most kids don't keep their imaginary friends that long. Edwardo despite being scary at first to scare off bullies was gentle, and became an example of someone for his kid to stand up for, Bloo becomes much much more jerky as the series goes on because as Mac is growing up he's becoming the example of how Mac shouldn't be acting. The strongest example is Mr. Harriman, he likely didn't start out as stiff and proper as he is now, he was originally a playmate for Madam Foster, but as she got older he needed to become an example of responsibility and adulthood, and eventually became her full blown caretaker as she became more in need of care in her old age. Harriman is strict, practical and stingy because that's the role he has to take to manage the house and take care of Madam Foster in her old age. The fact that he even changed his name to reflect that (his first name being Funny Bunny) shows the drastic change in himself.

Goo's imagination is powerful and capable of creating many times of things...
  • Goo has been shown to just talk about an imaginary friend in particular and POOF! It's instantly there. It has been shown with others, it takes moments of hard concentration. Due to highly developed imagination, she is somewhat a reality warped on some level. She could become rich with her imagination in severe ways. She could imagine up building for architects, weapons out of nowhere for the military, etc. She could even do Madam Foster a favor by imagining up more humans to adopt the other friends. Ooh ooh, she could even imagine up children for infertile families.

A kid has to be lonely to create an imaginary friend.
If having an active imagination was the only aspect of creating an imaginary friend, there would be lots of kids like Goo constantly creating new ones. So even if a kid is creating a friend for a different purpose, they have to be lonely deep down.

Due to the Hitler Youth, in the fosters world both Greedy Inhuman Jews and Perfect Aryan SS members became real groups of imaginary friends.
The Hitler Youth made the Children have imaginary friends based on the propaganda they were exposed to.

The Home is really the House Of Mystery.

A gentler version, at least. It would explain how the size and interior architecture varies so much from episode to episode, and what are imaginary friends but characters in stories that children tell themselves? Also, the exteriors are pretty similar.

Mac will adopt Bloo, as well as Wilt, Eduardo, and Coco when he is an adult.
By then, his mother will have zero say in his association with imaginary friends.
  • Alternatively, Mac ended up working at Foster's as an adult.

There are racially-insensitive imaginary friends out there.
Madame Foster's age suggests that people have been creating imaginaries for a long time, since at least the Jim Crow era. It's possible that many kids during the 30s, 40s, and 50s created friends based off of the kind of racist imagery that was common at the time, such as Blackface caricatures and red-skinned "Injuns" that speak in Tonto Talk. Since imaginaries don't age, that means that these friends are probably still running around today. Obviously, people wouldn't want these friends around, since they're a reminder of our ugly past, which makes me wonder what Foster's would do with them. Would they lock them up like with the Scribbles? Would they be banned from Foster's completely?

Coco was created by Mac's mom
In House of Bloo's, Mac's mom brought up that she once had an imaginary friend, who she had to leave as she grew up. Mac's mom however had no idea about Foster's, so it's likely that she abandoned her friend. Coco was found alone on an island by Douglas and Adam, who stated that she had no signs of a creator. Given her adamance over having Mac get rid of Bloo, it's possible that she probably feels guilt over leaving behind her friend on what was probably a vacation.
  • Also. it's worth noting that at the end of Good Wilt Hunting, Coco acts motherly towards her two adopter, with fixing Douglass's hair and cleaning Adam's face.

Mac has a [1] and is a severe [[Stepford Smiler.
Also, his relationship with Frankie.]]I have a very deep and complicated love-hate relationship with this show. I adore it for its concept but utterly despise it for its execution. However, that is a rant for another different time.

Mac has a special place in my heart. I take the theory of Mac having Asperger’s Syndrome very deeply into consideration because he and I share many similar qualities. I don’t know if that is just me tooting my own horn, but I closely relate to Mac. I, too, have AS, and Mac and I both are very intelligent, have a broad vocabulary and excellent deducting skills, are very imaginative, and have difficulty making friends and acting in social situations. I am a 25-year-old man and I have many imaginary friends and I wish to become a cartoonist sometime in the future.

A long time ago, you see, I had one of the strangest dreams. I had a dream in which I found myself competing in some sort of race to reach something before everyone else. Well, I was ahead of everyone else until I was then stopped by a gate. For some reason, there was this feeling of excitement and anticipation rising within me as I was unlocking the gate. The gate opened to reveal a path leading into a cave and I ran inside before the pack could catch up to me.

I traveled deeper into the cave before I found the finish line in the form of a door marked with graffiti. Inside rested, get ready, a corpse of all things with a knife placed beside it. I had to stab the corpse with that knife to win the race and I did so without a second thought. I know things could not have ended in a more morbid way, but here is where it gets very sad. Following the victory stab were no cheers for my congratulations, but hot tears pouring out uncontrollably… which were mine.

I cried in my sleep that night for the oddest of reasons. The other racers were there to offer their comfort, but what those tears meant confounded me. I talked to my friend about it a few days later while waiting for a psychiatrist’s appointment. I don’t think that I have ever cried since middle school where I had to put with a lot bullying for how I expressed myself with my Asperger’s Syndrome. I wanted to try and ask for the psychiatrist’s opinion on what the dream meant, but we were already in the middle of different discussion and the opportunity never came up.

It was then that I suddenly realized what the dream meant. Well, when I got home I learned that my dream was an interpretation of me racing toward a new life. The race represented my mood, the corpse represented an old dead part of me that needed to be buried, and the knife was interpreted as my anger and other negative emotions going into that corpse. The tears that I cried out that night were both tears of pain over what I to go through in my old life, which was represented by the corpse, and tears of relief that I could now move on to a better life. Looking back, I am now very thankful to have had that fateful dream because that very dream is what has inspired me to both write a new comic series and this rant

Truthfully, how professional this rant is typed out is sadly but a veneer that is covering up righteous fury. The reason I love Mac so much is more than just because we have similar traits. The reason I live him so much is because I feel his family situation is punch square in the gut.

My theory, or whatever it should be called, is that Mac has been raised in an incredibly abusive household. Let me talk about how simply his family life is so screwed up and then let me go into deeper detail. According to Mr. Craig Mc Cracken himself, Mac’s father is implied to be either dead or divorced. The reason why is never explored and I believe the show missed a wonderful opportunity to discuss that. However, this more than about a non-existent father for this rant mainly covers two of my most loathed characters besides you-know-who.

Mac’s unnamed mother and Terrence.

I hate these two with a burning passion and I will tell you why.

I have never met a character so cruel and hateful other than Terrence, a person who seems to hate imaginary friends so much that he is even willing to kill one. However, I believe I have reason to understand that he hates Mac twice as much. His cruelty was taken to the extreme in “Duchess of Wails,” and I explored the aftermath of this episode in a what-if.

The what-if goes deeper into Mac’s psyche concerning what he must put up with at home, and it is not pretty. Mac reveals, for instance, that he has no earthly clue of how to sort his mother’s bank files or whatever he said he could do in the episode “Franky, My Dear,” and that it was all pushed on him. Two chapters in, it is revealed that Mac’s mother and brother are both stuck in denial and anger respectively over the death of Mac’s father, and they both project it onto him. What’s worse is that Mac’s mother has grown to hate, yes, hate her child’s sense of imagination, wanting him to grow up and understand that life is not a beautiful as it seems, and that she harbors a prejudice towards imaginary friends.

Thankfully, Frankie steps in and decides to help Mac run away to Foster’s. Mac’s relationship with Frankie has always been more intriguing to me than his relationship with Bloo. I suspect that Mac’s “romance” with Frankie was all just a clever cover up. He was simply acting like he had a crush on her, when in reality, he was so ecstatic to actually find someone who legitimately treated like a son/ little brother.

If it’s one thing Mac excels at, it’s saving face, both in a good and bad way.

Mac has every single damn right to run away. Frankie no longer has that luxury because she is an adult and I could the say the same for Mac’s mother, come to think of it. The problem is that Frankie is an adult who has stated that she is in her early twenties. I’m sorry, but as far as I am concerned, adults do not have the right to run away from their problems and responsibilities. There is a lot that I want to say on this subject of Mac's family situation. I feel that I have kept to myself for far too long and if keep myself quiet any longer then nothing will change. I feel that must call out my piece so things can possibly change for the future.

At the beginning of the series, Mac’s mother forces her 8-year-old child to abandon his imaginary friend so he can “grow up.” The problem is that Bloo, Mac’s imaginary friend, is a living, breathing, thinking thing. He is just as human as the person that created him and he is being thrown out like he’s an extra mouth to feed. Later, to make another long story short, Terrence tries to go so far as to have Bloo killed.

In that very dream I talked about at the beginning of this rant, I felt that I was suddenly in Mac’s shoes. I felt that my life was going nowhere with a careless mother and a hateful older brother, not that my own family situation mirrors his. Both of those were represented by the corpse that symbolized my older life and I was severing that old life.

The least thing I can say about Mac’s mother and brother, is that they both served as nothing but tools to the plot.

You know what? I could even compare Mac’s situation to Woody's in "Toy Story 2." Woody ran away because he was afraid of never being loved again by Andy, why doesn't Mac do the same? There is a complete and utter lack of sympathy to Mac's situation I feel both in this fanbase and in the show.

Having been around the block a few times, it's my firm belief that children can be much smarter than most adults anticipate, and Mac is no exception. I used to wonder if Mac was made to suffer what with his careless mother, bully older brother, and implied to deceased or divorced father. I used to believe that Mac never had a choice in what went on around, but after looking to other places, I realized that I was wrong. Mac has always had a choice and he never realized it himself until he went to Foster's and met everyone. In my opinion, Mac is so much smarter than most kids his age and that is what is supposed to make him unique, and it greatly irritates me when others say that he is just a kid and that bullies like Terrence are "misunderstood."

Mac's mother has always been in the wrong in every decision she has made. From forcing her child to give up a living being and possibly security blanket for his father to threatening to move out, she is someone I would not like to have as my mother. If Mac's mother knew any better, she would realize that she sorely underestimates her 8-year old son and that it is Terrence who needs to have an eye kept on. Mac's mother had no right to force her child to grow up when it was clear that he was already mature for his age.

The three of them, Mac, his mother, and Terrence, all need to see a therapist ASAP. I personally consider it downright abusive to project all your problems onto your youngest child, force him to grow up when he barely is getting used to his childhood, and make him subject to an immature and hateful older brother's bullying and make Mac responsible for it. I talked to my own mother about this and she agrees with by saying that she would nothing to hurt so unlike Mac's mother, who wanted a living, breathing, and thinking creature tossed out because she thought she was an extra mouth to feed or an object.

All of this came from my head, not someone else’s, I swear.

I have tried talking to other fans and even Mr. Craig Mc Cracken himself, but so far there has been no answer.

Bloo was responsible for Terrence's Start of Darkness

Mac's mom had a different reason for wanting Mac to get rid of Bloo
It's not so much a matter of her thinking that Mac needs to grow up, it was simple economics driving her decision. She's a single mother, the sole provider for her children as far as we know from the show, meaning she has to earn enough money for the numerous expenses the family experiences through day-to-day life, possibly living paycheck to paycheck, and trying to make ends meet. The expense for a family of four is significant, meaning she has to work very hard. Maybe she couldn't keep affording to take care of herself, her two sons, and Bloo all at the same time. Maybe her hours at work were cut, maybe inflation spiked unexpectedly, but whatever the reason she realized that some hard decisions had to be made, and Bloo unfortunately drew the short straw in her mind rather than her own children.
  • Why didn't she explain that to Mac instead of making it sound like victim-blaming? Mac's a smart kid; he probably would have understood.

The reason Coco doesn't take requests
Her creator was a little girl who was stranded on an island. That much we know. At first just thankful to be alive, once Coco was created, she used her egg-laying only to get necessities. She eventually began testing the limits of Coco's ability, and slowly grew spoiled, reaching a point where she didn't even want to be rescued. Why would she? No rules, no worries, and everything she could ever need. Coco, on her own, managed to signal for help and get the girl rescued. She knew she would have to stay behind so that the girl could grow up to be a responsible, functioning adult. She now refuses to take requests to prevent spoiling her friends.

Frankie will one day inherit the house
After Madame Foster eventually passes away, she leaves the house to Frankie, who hires the main cast to help run the place.Frankie gets final say in everything that goes on. She had already proven that she'd be an excellent house president. Though she does occasionally spoil herself at the spa. Knowing how hard she had to work, she does a better job at dividing the work.Mac takes over Mr. Herriman's job. He handles the finances, paperwork, etc.Wilt does most of the cleaning and repairs. He's happy to do so, and it really comes in handy when changing high light bulbs. He also finally gets his own bed.Eduardo becomes the house chef, with occasional help from Jackie Khones. He likes treating the house to his special pies. He spends much of his free time taking care of the baby friends in the nursery.Coco, being surprisingly charismatic, handles all public relations. She assists people looking to adopt friends, handles phone calls, and advertising.Bloo started abusing Mac's authority, but karma caught up with him. His punishment involved being Duchess' assistant, and keeping Cheese out of trouble.Goo becomes Frankie's assistant. Having so many imaginary friends of her own, she knows exactly how to keep them happy and healthy.

Goo's mother is Lady Gaga
Her full name is, after all Goo Goo Gaga. She does have the wild imagination and the fashion sense one would expect from the pop star's daughter. Sure, Goo claims her parents let her choose her name, and that might even be true, but they were probably counting on her first word being Goo. Because, let's be honest, whose wasn't?

Creators can't chose imaginary friends' personalities
They're pretty much responsible for appearance, sure. But the friends have personalities of their own, or maybe based on their appearance. Would explain, for example, why Madame Foster created a stuffed shirt like Harriman when she wanted a funny bunny. Eduardo's creator wanted a brave monster, and got the Cowardly Lion we see. Terrence, the Jerkass bully, created kindly Red. Now, here's the interesting part - even still, creators and imaginary friends are really close. That's mentioned in the first episode featuring Goo - Madame Foster says she should take time to get to know her friends instead of creating new ones - so, if she's the one creating them, why wouldn't she know them? And there were different Bloos with different personalities in one episode, too.

Of course, that means that jerks like Bendy, Goofball and Duchess might have had sweet creators. You never know...

After the events of the show, Frankie became an alcoholic
The stress of taking care of the place and not getting to have a social life was really getting to her. She began going to the liquor store to get some whiskey or rum to help her cope, eventually to save money she imagined up an imaginary friend liquor bottle with a bottomless supply of liquor. After Madame Foster eventually passed away, she began drinking much more heavily until it became a full-blown addiction. After realizing how far she'd fallen, she checked herself into rehab, got sober and stuck to avoiding alcohol. Initially she did a good job taking care of Foster's and the friends once again, but aches and pains from doing so much work led to her getting prescription painkillers so she could continue to do her job, soon becoming a new addiction that wouldn't go away so easily. Like before, she imagined an imaginary friend pill bottle with an endless supply of strong opiate painkillers.

Eventually, Mac had to take over the home because Frankie was in no condition to take care of it herself.

Imaginary Friends rely on human companionship to survive
While it's commonly believed that Imaginary Friends are simply immortal beings, it's also possible that their "immortality" only lasts as long as they remain a companion to a human (or possibly a couple months or so longer). As humans are responsible for their very creation, this would make quite a bit of sense, and it would also explain why we don't ever seen any Imaginary Friend try to start a life on their own rather than staying with their creator or getting adopted by another human. The Imaginary Friends at Foster's manage to stay alive due to Madame Foster's caring personality, while the rest of the living friends stay alive through the companionship of either their creator or their most recent adopter. Given the fact that Foofy Woogums managed to survive several months since her creator lost her, it's likely that actual interaction is not exactly needed to keep the friend alive, and all that's really needed is mutual care for one another.

Example of: