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Blooregard Q. Kazoo (simply known as Bloo) is the overall deuteragonist of the Cartoon Network series, Foster's Home for Imaginary Friends. He is the only character to appear in every episode. He is known as Mac's best imaginary friend. He used to live with Mac and his family (which consists of his mother and his mean-spirited older brother Terrance), but when Mac turned 8, his mother told him that he was getting too old to have an young imaginary friend blue blob and told him to get rid of Bloo. Because of this, Bloo now lives in Foster's Home, a place where imaginary friends who have outgrown their creators live and are well taken care of until they are adopted by another child. Bloo has permission to live there permanently as long as Mac regularly visits. So far, Bloo is the only imaginary friend that we know the full story of.
Bloo is a blue-colored, dome-shaped, cylinder-like and blanket-like imaginary friend with curved arms, bulging eyes, a little mouth and stubby hands which are fingerless. He stands at two feet in height and weighs ten pounds.
He's at the core of his personality, a clever, self-centered, mischievous, cynical, jealous, greedy, narcissistic, antagonistic immature maniac. He is also shown to be a rebel, compared to Mac, who is the smart one. He is abrasive, trouble-making, immature, jealous, and manipulative, partially due to his restless energy, cleverness, and delusional narcissism. When first introduced in the pilot episode, Bloo was shown to have a slightly more gentle personality, kind to everyone and willing to protect his creator and best friend, Mac. However, somewhat quickly, his personality shifted considerably (likely due to a writer choice to fully differentiate his personality from Mac's). He developed a rather quirky personality and has often proclaimed himself to be "the best imaginary friend ever." This was in jeopardy when Uncle Pockets visited. He has often demonstrated a hyper, albeit nonchalant personality and is sometimes incredibly naïve and childish. But in Camp Keep a Good Mac Down, he endangered everyone by selfishly eating all their food and drinking all their water.
Still, as demonstrated in the episode "Read 'em and Weep," he ultimately has a good heart and cares very deeply for his friends. When Eduardo is thought to have been "shot" by hunters, Bloo bursts into tears and confesses how much Eduardo meant to him as a friend. However, when Eduardo is later found to be alive and well, Bloo tries to cover for his previous outburst by acting flippant about the whole thing. Also on The Sweet Stench of Success Bloo shows to care greatly for Mac and his friends as he continuously tells the Hollywood producer he wants to go home, or at least call Mac as he misses him. Also near the end, when he was singing, he exclaimed his friends offer more like love and affection. Though on most episodes, he'll try to cover up for his caring side.
Bloo often has a tendency to accept outrageous ideas as fact to explain seemingly mundane occurrences, and bends others to his will, going so far as to make them go against their moral standards. Bloo also displays a passion for paddleball, although he never succeeds in making the ball hitting the paddle, to which he insists that all his paddles are broken. (the only time he ever was able to do it right was in "Let Your Hare Down")
There are times when Bloo's cleverness is muted, however. He sometimes can be tricked by rather simple appearances. Occasionally, his thoughts tend toward the bizarre, going as far as paranoia. Lessons in the form of metaphors are lost on him. His cleverness also has limits when he is distracted. However, Bloo has only been intentionally outsmarted a few times throughout the series.
Bloo often disregards the rules or finds loopholes in them easily, and sees rules as only obstacles preventing him from having fun. Bloo and Mac are usually the ones at the receiving end of the episode's morality tale (mostly Bloo), usually because Bloo's antics got them there in the first place. Bloo is always making mischief in the house. He has broken eggs, stolen items, gone onto federal property, and broken windows. Sometimes, however, Bloo's antics go unpunished (or at least unpunished as a direct result of his crimes) in various episodes. Even when the moral lesson is obvious Bloo rarely learns it, and from episode to episode shows no growth of moral character, usually committing worse crimes as the series goes on. In Cheese A Go-Go he got arrested because he illegally used an intercom at a space observatory to call out for aliens to take back Cheese from Earth. In Bus the Two of Us, he stole Frankie's bus and drives it for a majority of the episode while committing far more serious crimes along the way like writing obvious lies on a job application to get hired as a pizza delivery guy, impersonating Frankie, destroying property and ignoring police calls to pull over.
In the course of the show, he has committed an amount of mischief and indiscretions. Bloo has apparently been arrested at one point or another; he knows a security guard well enough by his first name and that he has children.
- It is revealed that Bloo is Mac's 5-year-old son.
- Bloo has been criticized harshly by some of the viewers of Foster's Home for Imaginary Friends because he is extremely unpleasant, rude and selfish in episodes.
- Heroic act: When Berry tried to kill Mac, Bloo rescued him with an automatic Paddleball sending Berry on another giant Rubberband Ball roll.
- Bloo (along with Duchess) is one of the only two characters who doesn't like Uncle Pockets.
- However despite being one of the two main protagonists of the series, he's unclever, self-centered, mischievous, cynical, jealous, greedy, selfish, narcissistic, antagonistic, and immature maniac as he makes mischief in the house, and has committed crimes, and acts like a jerk most of the time.