And now for some Fridge Brilliance, in the episode where Bloo thinks Mac is a nerd, Bloo is put up for adoption and everyone thinks he is like some famous person for no explanation. Until you remember this takes place after Bloo was a TV star.
In Emancipation Complication, the tiny pen resembling Abraham Lincoln sold imaginary friends to do people's chores. You know, as slaves. Didn't the original Abraham Lincoln have something to do with slaves, as well?
In "Bloo Superdude and the Great Creator of Everything's Awesome Party of Fun", Broccoli asks Bloo what his name is, and he replies "Jimmy! No, wait..." This might seem a little bit too stupid, even for Bloo, but it's said in the pilot that "Bloo" is actually just a nickname. His name is actually "Blooregard Q. Kazoo", and at the time he hadn't been referred to as that in 5 years, making it a little more understandable.
As the series progresses, Bloo's Jerkass tendencies wildly accelerate into a point where he's pretty much nothing more than an insufferable and cruel individual with rare Pet the Dog moments. But as the TV movie and later episodes imply, imaginary friends often seem to grow into opposite roles of their creators, such as Wilt gaining Extreme Doormat tendencies which encourage his former owner to take his life into his own hands, or Eduardo's owner becoming a police woman to grow brave due to his crybaby nature. In this sense it can be argued that Bloo Took a Level in Jerkass as sort of a polar opposite to Mac's Nice Guy nature, essentially being a Secret Test of Character to help Mac grow up as an individual with neither of them the wiser. But since imaginary friends are still people too, Character Development can help them grow out of this as well.
Plus it could also be all the stuff with Mr. Herriman's not so nice treatment of the other house guests. Given Bloo was likely picked on a lot by Terrence with Mac, he may have had enough with being treated like a doormat and decides to push back by becoming just as big (if not more so) of a jerk than those that picked on him and Mac. Really it could just be a form of aggressive self preservation since Mac can only visit him after school or whenever he's around, so he's really just a being stuck in a big house with people he could see as friends come and go. It also helps that he's not AS bad towards Mac as others, as his things are mostly just pranks and seems to genuinely care about Mac's opinion on him. Meaning that besides Mac, he doesn't seem to want to make as long term connections with people who can go at any moment.
The concept of the show really. Even fans of the show must admit that a world where sentient creatures are forced to leave their families that raised them and put into foster homes is a very disturbing idea. What was life like before Foster's was even opened? Were imaginary friends just thrown out on the street... or even killed? For such a funny and overall light-hearted show, you really need to wonder how they think. For a show based on a pet shelter, it's surprising they never really thought that through.
Uncle Pockets' debut episode lends support to the "thrown out on the street" interpretation—he mentions that he wandered in the streets after his creator abandoned him until Madam Foster found him and took him in.
Further Fridge Horror—is Foster's the only institution of its kind in this world? What happens to imaginary friends in other parts of the world if they can't find good homes?
Bloo is as close to a sociopath or psychopath as you are ever likely to find in a cartoon, and one of the most unpleasant and downright manipulative characters on the show. It is hard to understand why Mac cares for him when all he does is abuse him. For Mac's birthday, Bloo gets everyone in the house to help him trick Mac, abuse him, and finally humiliate him in front of EVERYONE. They all laugh and leave little eight-year-old Mac alone in the ruins of his own birthday party dressed up as a clown because they manipulated him into thinking that he had ruined somebody else's party and that he had to make it up to them. In short, they tricked him into destroying his own birthday party more than once on the same day when all he wanted was to be left completely alone all day and not tormented or humiliated by his "best friend"). Wow. Also Madame Foster, despite being rich, steals from him. And not anything little either. Mac, probably the nicest person in the whole show, is going to grow up to be insane and depressed.
There is an imaginary friend shaped like a raindrop that likes to jump off the roof. He has a little umbrella so he can just float down. However, he likes company. He drags people up to the roof to jump off with him when they are sad.
Actually, most people might not realize it, but the ENTIRE universe of Fosters is nothing but pure Fridge Horror. They all exist in a universe where all of a persons imaginative thoughts can come to life if believed in hard enough, so that would mean somewhere the visual and audible hallucinations of the mentally insane are alive and secretly roaming somewhere and menacing and possibly killing people at random.
Absolutely nothing personifies the Fridge Horror of Fosters more than Cheese. As a cartoon he's fairly cute if only more then slightly annoying. However, if one takes a minute to imagine if Foster's were ever made into a live-action film, Cheese would appear as a small balding highly deformed human (in appearance) with bug eyes who makes disturbing screaming noises (sometimes in empty dark rooms) at random moments while also saying sentences in Creepy Monotones with deeply contorted expressions; yet somehow were are supposed to believe that he was invented/imagined by a sweet five year old girl.
Stop to consider for a moment that no imaginary friend is shown to age (it's suggested/easily believed that Herriman was just born that old). If that is the case, then one of three things must happen. One is that imaginaries never die, and will wander the world for all eternity, constantly seeking the attentions of children (which is horrible in and of itself). Second, there is a euthanasia program for imaginaries. As a fan of the show, imagine your job being putting Wilt down. Options 1 and 2 could come together, and imaginaries eventually kill themselves.
World was sealed inside of a toy chest. Okay, fair enough, but we have no way of knowing just how long he was in there! Apparently long enough to make him extremely mentally unstable. Think about it, he was sealed in that chest, alone, for who knows how long. Yeah, he's a Reality Warper, but he's unable to make the one thing he wanted more than anything else, other sentient creatures to actually interact with. Imagine being in an entire world with you being the only sentient being in all of existence...no wonder he was so upset when they tried to take Frankie away...
At the end of the pilot, the Xtremosaur Duchess releases gets killed. But when Wilt was talking about the monsters in the cage, he said that "They are called Xtremosauruses"-which means Duchess actually let out multiple dangerous monsters, and only one was found...
Berry. A Yandere who fell in love with Bloo the first time she saw him, and would stop at nothing to get rid of his best friend, Mac. Yeah, we don't know what exactly caused her to be that messed up (beyond the obvious of Bloo not paying her any attention,) but it does make you wonder who thought her up. It's even worse when he or she could have been worse than her...
Though it's just a quick gag, Frankie is shown to have become overweight from finally being allowed to gorge her fill on Madame Foster's cookies in "Cookie Dough". Had the cookie fad and business not crumbled, and how addicted she was to the cookies, it's quite possible Frankie would've ended up becoming obese for the rest of her life.
In "The Big Cheese": Sure, Cheese was probably just going on about random things as usual, but what if he wasn't and he really did have some or all of the diseases he yelled about?
Doubles as a tearjerker, but if Bloo is supposed to be based off a child's security blanket, why isn't he nicer to Mac? Shouldn't he be more compassionate? Maybe not- since a jerkass and negligent family is the only security Mac's known. It's also been theorized that Bloo was created to help Mac express his snarkier side and the other parts of him that don't quite fit his Nice Guy reputation; unfortunately, this worked a little too well... and the abusive older brother and absent parents probably didn't help.
On a related note, when Bloo started to hallucinate from hunger in Dinner Is Swerved, Bloo seemed incredibly ready to eat the anthropomorphic chicken leg that he thought was Mac until he learned it was another imaginary friend. He was willing to eat his friend, understanding it was his friend, but not someone who actually is food. Let that sink it...
In "Mac Daddy", the scene where Bloo is frantically looking around for Cheese and pictures him getting into all kinds of dangerous scenarios becomes all the more disturbing when you imagine what actually might happen if Cheese was badly injured or even killed. Louise, a little girl who looks younger than Mac, would be scarred for life if the latter happened and might never speak to Mac again. And that's not getting into the potential lawsuits towards Foster's and Mac's family if her parents found out. Not only would Mac's mom find out about Foster's and ban Mac from seeing Bloo again, but Foster's could end up getting shut down, leaving who knows how many friends homeless. Since this would all be Bloo's fault for trying to get rid of Cheese in the first place, he would most likely become a pariah, with all of his former friends hating his guts and wanting him gone.
The fact that the last episode ends with Cheese moving into Foster's to the displeasure of everyone in the house because Louise has moved to a place that doesn't allow imaginary friends. True, it is a funny gag, but it's really depressing to imagine how Louise, a young girl, is taking being forced to say goodbye to her imaginary friend just because he can't come with her.
There's also the fact that this means that at minimum, there's Fantastic Racism rampant against Imaginary Friends (that frankly smacks of Jim Crow laws) and it could even mean that Imaginary Friends are considered unusually intelligent animals...suddenly the idea that there's a program to euthanize unwanted Imaginary Friends is disturbingly plausible.
Terrence is 13 and Mac is 8, meaning that the age difference is 5 years. Since Mac's dad is never seen, and considering that losing one's father at a young age can prove traumatic, could it be that Terrence bullies his younger brother because he blames Mac for their father dying/divorcing their mother?