'''''Here be the WesternAnimation/FostersHomeForImaginaryFriends characters and the tropes they embody.'''''



->'''Voiced by:''' Creator/SeanMarquette

A creative, smart, and very warm-hearted 8-year old. Bloo is his imaginary friend.
* AbsenteeActor: It is possible that his voice actor (Sean Marquette) was busy with something else during the making of the episode "Pranks for Nothing".
* AdorablyPrecociousChild: Despite the fact that he's only 8, all of the main cast relies on him for advice and planning. He lampshades it frequently.
* AuthorAvatar: Creator Craig [=McCracken=] based Mac on himself as a child. His mother actually noted on it.
* AllLovingHero: He's friendly and compassionate with just about everyone. The only exceptions are his brother Terrance, Duchess, and Berry.
* AxCrazy: Mac's personality goes from a very NiceGuy to completely lunatic if he gets even the smallest amount of sugar.
* BadassAdorable: He doesn't "fight" often, but when he does...
* BigEater: Only when it comes to sugar. Just one small amount of it will drive him into a frenzy of devouring anything sweet he can find.
* BirthdayHater: With a twist; Bloo giving him surprise birthdays on almost any day except the actual day of his birthday (with one exception), he's grown something of a hatred towards them. It's mainly because he's put in embarrassing situations.
* BreakTheCutie: If Bloo is separated from him. Even if Bloo causes his most woobie-ish moments, he becomes an even bigger woobie.
* CainAndAbel: He's the unfortunate Abel to his brother Terrence's Cain.`
* CharacterizationMarchesOn: In season 1 episode "World Wide Wabbit", Mac is seen at one point eating cookies, but it's later revealed in season 2 that should he eat sugar, he becomes a crazy lunatic. Those cookies were maybe sugar-free, but still, makes you wonder...
* CheerfulChild: Even if something does get him down, it never keeps him down for very long.
* ChivalrousPervert: The pervert part is implied, the chivalrous part is clear-as-day.
* TheConscience: For Bloo. Without Mac, Bloo would probably be a complete monster.
* CovertPervert: Also, he was ''very'' curious of the "Adults Only" movies Frankie kept in her room. All the same it could be sort of excused, since it doesn't have to prove he's actually perverted; any child would be curious of what the adults are hiding from them.
* TheCutie: Mac is likable, sweet, and precocious.
* DisappearedDad: Mac's father is never mentioned. He just has his [[ParentalNeglect mom]] and [[BigBrotherBully big brother.]]
* GRatedDrug: NEVER give Mac sugar. Seriously.
* HeroesWantRedheads: His crush on Frankie.
* HeterosexualLifePartners: With Bloo.
* MasculineGirlFeminineBoy: The Feminine Boy to Frankie's Masculine Girl.
* MoralityPet: He is the only living being that Bloo even remotely consistenty shows compassion and care for.
* MyGodWhatHaveIDone: While Mac said what he did(See RageBreakingPoint) because he was so steamed, he looked in the present Goo was about to give him. [[spoiler:Turns out she fixed the backpack that was rendered unusable from a broken strap at the start of the episode]]. Needless to say, Mac realized he shouldn't have snapped and apologized to Goo.
* NiceGuy: In contrast to his rude and selfish imaginary friend, Mac is a very kindhearted person.
* NotSoAboveItAll: Loads of times. Many episodes, particularly as the show went on, are built around him doing something more childish with Bloo and not being the voice of reason - or ironically applying his reason and wisdom to something immature. Imaginary friends also appear to take up qualities of their creators, and he ''is'' the one who made Bloo in the first place. So in a way, it makes sense that he has a more chaotic part to his personality. He once got detention for shooting spitballs in class- a very Bloo-esque behavior- and when left in Foster's alone with Bloo, it's ''Mac'' who decides to go wild.
* OnlySaneMan: This trope, however, is wonderfully averted if he eats too much sugar.
* OutOfFocus: Not in the show, but in the merchandise. Whenever merchandise of the series is released, expect Cheese to take his place (except for one shirt with both him and Cheese on it, and at least he did get a stuffed animal and figuriene of himself)
* PingPongNaivete: Rarely, but the show does still remind us that he's ''eight'' sometimes. For example, in "Camp Keep A Good Mac Down" he's his usual WiseBeyondTheirYears self, basically being the only thing keeping the crumbling camping trip afloat - except for the scene where Eduardo tells him a scary story and he starts freaking out like a kid his age normally would.
* PrecociousCrush: His crush on Frankie.
* PuppyDogEyes: Always on, a combination of the show's art style and the interesting shape of his head.
* TheProtagonist: He's primarily the main character, though he switches between being the protagonist or deuteragonist with Bloo.
* RageBreakingPoint: After getting barred from Foster's--and his only friend--because of Goo's antics and obliviousness, Mac decides he's had enough of her and [[ReasonYouSuckSpeech lets loose everything he's thought about her]] in the past few days he's had to put up with her. Thankfully, he makes it up with a heart-to-heart talk and apologizing.
-->'''Mac:''' "I don't like you! Don't you get it? Nobody likes you! You're annoying and weird and you talk too much, and Bloo's name is not Chester, Mr. Herriman is not a badger, that's not how you play checkers, and protein doesn't come from bananas, it comes from nuts, which you don't need to eat more of because you are nuts! You're chock full of nuts! You're so nuts, you drive me nuts! ''(Jumps in Goo's face)'' Get it? Get it? Get it? Get it? Get it? Get it? Get it?! Everybody thinks you're a nuisance and they all want you to just GO HOME!"
-->'''Goo:''' [[TheWoobie (runs off in tears)]]
* TheReasonYouSuckSpeech: Delivers one to Goo in "Go Goo Go". Results in MyGodWhatHaveIDone
* RedOniBlueOni: The blue to Bloo's red.
* SavvyGuyEnergeticGirl: Savvy Guy to Goo's Energetic Girl.
* SensitiveGuyAndManlyMan: The Sensitive Guy to Bloo's Manly Man.
* ShesNotMyGirlfriend: Says this regarding [[GenkiGirl Goo]].
* ShipTease: With Goo. He once held her hand to lead her out of Foster's, and she asked him slyly why he was doing that, which led many residents of Foster's to believe they were going steady, [[ShesNotMyGirlfriend which he denies.]]
* ShrinkingViolet: Not quite as shy as most examples, but he's still a pretty introverted 8-year-old boy.
* SquishyWizard: In a world where a child's imagination can be given life, he's exceptional. But he's still exactly as strong as a little boy could be expected to be.
* StepfordSmiler: In "Go Goo Go" when he has to tolerate Goo's antics, [[TheReasonYouSuckSpeech until he finally]] [[BewareTheNiceOnes snaps.]] One could say he's Type A all the time, due to his depressive home life. However, it's not confirmed and it's debatable.
* SweetTooth: He ''really'' likes sugar, but he can't eat it because he'll go on a raging bender.
* VitriolicBestBuds: With [[{{Jerkass}} Bloo]]. Not in the pilot, but in the rest of the series.
* VocalEvolution: His voice gets lower and somewhat scratchy after a while, due to his voice actor hitting puberty. This is ''very'' noticeable, especially when on the DVDCommentary for "Store Wars", you can hear him (the DVD came out during season five) talk against his higher voice in season one.
* WiseBeyondTheirYears: Most of the time, though he can act his age and be as childish as the rest of them DependingOnTheWriter.
* YourSizeMayVary: In some episodes, he's as tall as Bloo, but in others, he's taller. Justified, as he's 8 years old and was probably going through a few growth spurts.

[[folder:Frances "Frankie" Foster]]
->'''Voiced by:''' Creator/GreyDeLisle

Granddaughter of Madame Foster; caretaker at the mansion.
* AlliterativeName: '''F'''rances '''F'''oster. Also applies with her nickname.
* AlmightyJanitor: She has to answer to Mr. Herriman and Madame Foster, but she basically runs the entire house all by herself. And as it turns out her pay check is actually ''larger'' than Mr. Herriman's.
* AnimeHair: Her hair is pretty wild.
* BalloonBelly: The end of "Cookie Dough". Apparently Frankie's grandmother's cookies are irresistable enough to turn her into a temporary BigEater with a side of crazy.
* BareYourMidriff: The t-shirt she's always wearing stops just short of her belly. It's more noticeable when her jacket isn't on.
* BewareTheNiceOnes: Frankie is an easygoing person, but you ''don't'' want to piss her off. Dylan finds this out after admitting his plans to imprison and enslave Frankie and is abusive to her friends.
* ButtMonkey: In a few episodes, especially "Imposter's Home", which is a half hour long HumiliationConga that culminates in her being the only one to miss a concert she'd been dreaming of for months.
* ColdTurkeysAreEverywhere: Don't let her know that Madame Foster made cookies.
* CoolBigSis: Takes this role wherever Mac is concerned. Also is this to a lot of the friends (especially Bloo, even though they drive each other crazy half the time, they also have fun working together to pull off zany schemes)
* DarkAndTroubledPast: According to [[WordOfGod Word of God]] due to Frankie's dad (who was Madame Foster's son) having a bad relationship with Mr. Herriman, Frankie wasn't allowed to have or create her own imaginary friends. When she finally created one of her own, she was forced to get rid of them thanks to her dad. Her main reason for living with her grandma in Foster's Home instead of with her parents? So she could see that same Imaginary Friend she herself created again someday.
* DeadpanSnarker: She most notably makes remarks about Mr. Herriman ordering her around and complaining about how she does her work.
* DudeMagnet: Mac, Bloo, Prince Charming, two geeks, a pizza delivery guy, and many more have fallen in love with her.
* DudeWheresMyRespect: She's a hard worker and more or less does ''every'' chore in the house, and Mr. Herriman ''still'' thinks she's a lazy good for nothing. [[spoiler: Until ''Destination: Imagination'' where he realizes he's been taking her for granted and then institutes a system where the work is divided fairy among the housemates.]]
* FieryRedhead: She has red hair and especially gets furious when Mr. Herriman pushes her too far.
* GRatedDrug: Her grandmother's cookies. Let's just say it's best that she never catches wind of them.
* GreenEyes: Shown in "Destination Imagination" when she looks into the window of the dollhouse.
* ICantBelieveItsNotHeroin: Her cookie obsession.
* MasculineGirlFeminineBoy: the Masculine Girl to Mac's Feminine Boy.
* NiceGirl: But then again, even she has limits.
* NotSoAboveItAll: Shifts between being the voice of reason and being as immature and zany as most of the imaginary friends.
** In World Wide Wabbit, she laughs along with everyone else and happily works with Bloo to merchandise Mr. Herriman's "Funny Bunny" routine until Mac makes her destroy the copies and explains that her job will be tougher if he finds out, she then panics and has a similar conversation with Bloo.
** In Frankie My Dear, she handles Dylan's admission of being a [[BitchInSheepsClothing faux nice guy who wants to turn Frankie into a slave]] by giving him a bloody nose and a wedgie, MomentOfAwesome, yes, but still atypical for a 22 year old woman.
** Rather than stop Bloo from mixing dangerous chemicals that nearly blows up the house, she simply makes a bet with him that it would be a bad idea in "Imposter's Home for Um... Make 'Em Up Pals". However immature you may find it, though, calling what happened afterwards DisproportionateRetribution would be the understatement of the millennium.
** Most obvious when it comes to Madame Foster's cookies, which serve as a GRatedDrug.
* OnlySaneEmployee: Between the neurotic Mr. Herriman and the absent-minded Madame Foster, it often falls to Frankie to be the voice of reason.
* OnlySaneWoman: She plays the "Straight Man" role unless it's Mac's turn.
* PsychopathicWomanchild: Whenever Madame Foster makes her famous chocolate chip cookies, Frankie will regress into this.
* ReasonableAuthorityFigure: If the Friends have a problem, Frankie's their first choice to resolve it, and they'll avoid Mr. Herriman at all costs.
* RedheadInGreen: Typically a green jacket. She rarely removes it.
* ServileSnarker: To Mr. Herriman.
* SheCleansUpNicely: Frankie ''can'' do hot. Oh yeah.
* SignificantGreenEyedRedhead: Not shown due to the art style but her drivers license says she has green eyes.
* SingleWomanSeeksGoodMan: Proves this when she went on her date with [[{{Jerkass}} Dylan]]. She initially liked him because he appeared to be a gentleman, but was immediately disgusted when she found out that he only thought of her as a property.
* SpikyHair: Her hair ends in a lot of points.
* TalkingInYourSleep: Frankie does this not once but twice in "Let Your Hare Down" when she has, err, fantasy dreams about action star Rod Tango.
* TomboyishName: Frances "Frankie" Foster.
* TomboyishPonytail
* TrademarkFavoriteFood: Goes absolutely insane for Madame Foster's chocolate chip cookies.

[[folder:Madame Foster]]
->'''Voiced by:''' Creator/CandiMilo

Owner of the mansion; very lively for her age.
* BadassAdorable: She's a cute-as-a-button elderly lady and she knows how to kick ''ass''.
* BigGood: As the owner of Foster's Home, she's the most significant and benevolent character in the series.
* CoolOldLady: She's much nicer than Herriman, and she often plays along with Bloo's antics.
* GenkiGirl: Even in her old age, she's got ''a lot'' of energy. Even Frankie can't keep up with her.
* TheGhost: For most of the pilot movie, to the point where Bloo assumed she was dead.
* JerkassBall:
** Madame Foster holds many of these throughout the series. A prime example would be Stealing the Europe tickets from Mac in "Foster's Goes to Europe" to travel with her friends was probably her lowest point in the series.
** In the short "Birthday Cake Bloos", she devours Bloo's birthday cake for no reason at all and also has the gall to gloat to her granddaughter that [[ScrewTheRulesIMakeThem she can't really be punished due to being the foster home's owner]].
** In "Beat with a Schtick" When she finds out Bloo is going to face "The New Guy" who's a gigantic monster looking figure what does Madame Foster do? She raises money off of Bloo's suffering by betting against him in a poll. For someone who's suppose to be the founder and head mistress of the household isn't Madame Foster suppose to care about the well being of the friends? But here she's betting against Bloo simply to watch him be in pain. And what she did had nothing to do with "The New Guys" joke.
** At the very end of "Store Wars" she's completely ungrateful at Bloo's attempt to give her a Birthday present stating "the thought doesn't count".
** Then in "The Big Lebooski" where she acts like a Raging Shrew and yells at Mac constantly, simply because she's mad that they aren't going to win. Then the plot twist being they weren't competing to win, but just to outdo her rival. So basically Madame Foster was a Jerkass to Mac for NO reason! She doesn't even apologize to Mac, she just thanks his dumb luck.
** In Season 5's "Say it isn't Sew" she goes against the promise she made to Bloo about being in the sewing store, all while insisting he has to wait on her due to "partner loyalty" even though their main reason of being there was to fix a button that broke off her shirt. While Bloo wasn't totally innocent (as he asked for it for ditching Mac even though they would've made it on the Bus anyway) Madame Foster is no better and fails to hold up her end of the bargan simply because she found something of her own interest. Made all the worse when her friend Flo comes and chooses to wait longer despite promising Bloo they'd be going right after they payed to leave.
** In "Crime after Crime" she acts like a hateful shrew and keeps berating Frankie for not getting "It" right. And then laughs at Bloo's agony when he's forced to eat the gross meal she made Frankie prepare. That line where she goes "it's not as bad as it looks, its much WORSE" just implies that she likes laughing at others misfortune.
** In the Season 5 episode "Ticket to Rod" Madame Foster takes a massive JerkassBall moment toward, Mac, Frankie and Bloo. She basically teams up with Bloo and both of them sabotage Mac and Frankie simply to get the tickets to meet Rod Tango. Madame Foster is willing to sabotage Frankie her own granddaughter and shows absolutely no remorse for it. Madame Foster even states herself that she didn't regret doing it. Then later after Bloo is mean-spiritedly thrown out by Rod Tango himself Madame Foster just acts like a complete Jerkass toward Bloo and gets away with basically conning two people and literally dumping the other one simply to get her place to see Rod. It's basically them taking the ending of "Fosters Goes to Europe" and making it into a full episode.
* MiniatureSeniorCitizens: She's even smaller than Mac.
* MoralityPet: To her imaginary Mr. Herriman, in a sense. She's basically the only person who can convince Mr. Herriman to not be such an overbearing stickler for the rules.
* NiceGirl: She's generally a friendly and good-natured person.
* OutOfCharacterMoment: Holds many of these throughout the show. See JerkassBall below.
* {{Troll}}: While she's a very nice and wise person, she also deeply enjoys messing with people and watching chaos unfold. This in turn makes her have her Jerkass Ball moments. You can even consider some to be OutOfCharacterMoment.

[[folder:Goo Goo Ga Ga]]
->'''Voiced by:''' Music/GreyDeLisle

An extremely talkative girl who has imagined LOTS of friends.
* {{Adorkable}}: She's weird, silly, talkative, and sweet natured.
* AttentionDeficitOohShiny: She's even more easily distracted than Bloo is. It's also subtly implied that she might actually have [[AmbiguousDisorder Attention Deficit Disorder]], but it's impossible to say for sure.
* {{Cloudcuckoolander}}: She lives on a completely different plane of reality. It's partially because she was raised by HippieParents.
* EmbarrassingFirstName: Would you be okay with the fact that your name is "Goo?"
* EverythingsBetterWithRainbows: She seems to think so, what with her rainbow-colored outfits.
* FriendlessBackground: The reason she makes up all of those imaginary friends.
-->'''Goo''': (''after imagining a bunch of cute little tear drop friends'') Do you know why I make up so many imaginary friends? [[TheWoobie Because I don't have any]] ''[[IJustWantToHaveFriends real]]'' [[TearJerker friends]].
* GenkiGirl: She's got way too much energy. She's almost at the level of Mac when he's had too much sugar.
* MsImagination: Unlike Mac, she'll just create whatever imaginary friend comes to her mind.
* MotorMouth: She constantly speaks a mile a minute.
* NiceGirl: Once you look past her wackiness, she's very nice.
* NiceShoes: They're some kind of cross between clogs and cowboy boots.
* OpenMindedParent: Both her parents are stated to be this (and possibly HippieParents too). Could be seen as a deconstruction too; her parents are implied to be way ''too'' open-minded, as they not only let her choose her own name as a baby (which is why she's named "Goo Goo Ga Ga") and allows her to dream up all those imaginary friends because they don't want to "stifle her creative mind", even though this terribly burdens Foster's Home and keeps her from actually making friends with the ones she's already made.
* OutOfFocus: She appears the most in Season 4.
* RealityWarper: In a way. Her imaginary friends are bound by whatever rules she makes for them, and the laws of physics will bend around them to make it so.
* RecurringCharacter: In Season 4
* SavvyGuyEnergeticGirl: Energetic Girl to Mac's Savvy Guy.
* ShipTease: With Mac. Mac once held her hand to lead her out of Foster's, and she asked him slyly why he was doing that, which led many residents of Foster's to believe they were going steady, [[ShesNotMyGirlfriend which Mac denies.]]

->'''Voiced by:''' Creator/TaraStrong

Mac's evil 13-year old brother, and one of the antagonists of the series.
* AloofBigBrother: He and Mac are not very close to say the least.
* AxCrazy: The way he bullies Mac goes well beyond sociopathic behavior.
* BigBadDuumvirate: With Duchess in the first episode.
* BigBrotherBully: He bullies Mac relentlessly. Their mom thinks it's because Mac is too kiddy, but he's probably just a jerk.
* CainAndAbel: The Cain to Mac's Abel.
* ClosetGeek: He's a fan of ''The Loved and the Loveless''.
* CrossDressingVoice: Tara Strong reportedly hates doing his voice, because it strains her vocal cords to their limits.
* DemotedToExtra: After playing a really important role in the series premiere, Terrence became more of a minor character as the series went on. It got to the point where he was eventually OutOfFocus by the last two seasons that some viewers forgot that Mac even had a brother. Though considering that his voice actor Tara Strong has said that he was her least favorite character to do due to his gruff voice being such a strain on her vocal chords, his lack of appearances in the later half of the series was likely a result of that.
* TheDitz: He's incredibly stupid. He can't even tell the difference between red and green.
* DumbMuscle: Although appearing very skinny and weak, he's punched a hole in a wall, is able to carry Mac with one hand, and is able to get up with Eduardo, Wilt, Coco, Goo, and Bloo on his back.
* EvenEvilHasStandards: Hilariously [[SubvertedTrope subverted]] in the pilot episode.
* EvilSoundsRaspy: Terrence speaks in a ''very'' gruff voice.
* {{Expy}}: Of [[WesternAnimation/ToyStory Sid Phillips]].
* HateSink: His entire existence pretty much hinges on how unpleasant he is.
* HiddenDepths: Who'd have guessed that [[BigBrotherBully Terrence]] of all people would be [[DaytimeDramaQueen a fan of]] ''[[SoapWithinAShow The Loved and the Loveless]]''?
* {{Jerkass}}: He's not a nice guy. And unlike other unpleasant characters in the show, he has no redeeming qualities.
* LaserGuidedKarma: In episodes where he plays a big role in, he would usually suffer a nasty fate, such as being attacked by the unicorns, swallowed and later spit out by an imaginary sea monster, getting chased by imaginary bees, and feeling the electric wrath of the Extremesaur.
* LeanAndMean: Although he's pretty strong for his size.
* {{Leitmotif}}: He always has a metal theme play when he shows up.
* MusclesAreMeaningless: Despite the fact that he's thin and spindly, he's much stronger than an average 13-year-old.
* OutOfFocus: In seasons five and six.
%%* TheSociopath:
* TeensAreMonsters: He's a teenager who bullies his little brother and in general is very unlikable.

[[folder:Mac's Mom]]
->'''Voiced by:''' Music/GreyDelisle

Mac's mother, who made him get rid of Bloo in the first place, but is unaware of his daily visits to Foster's. She works all day, and Mac hardly ever gets to see her.
* AdultsAreUseless: Zigzagged. Mac's Mom is usually too busy to see Mac or deal with Terrence's bullying but unlike most cartoon moms, she's ''not'' oblivious to the abuse that Mac goes through, and tries to stop it. But to her, the problem is Bloo, and the series kicks off with her forcing Mac to get rid of Bloo. And the rest of series, she is completely unaware of the fact that Mac visits Bloo at Foster's everyday. The latter is more to do with the fact that Mac's afraid of how she'll react than anything else.
* TheFaceless: Her face is never shown.
* HartmanHips: She has a sizeable lower body.
* MaleGaze: Enforced, has her face is never shown.
* OutOfFocus: She is not seen in seasons 2, 5, and 6 aside from being mentioned, she makes her last appearance in I Only Have Suprise For You.
* ParentalNeglect: She hardly ever gets to see Mac, because she works all day every day.
* WellIntentionedExtremist: She tries to stop Terrance's abuse of Mac.....''By asking Mac to send away Bloo'', who despite being imaginary is every bit as alive as his human companions.

[[folder: Kip Snip]]

* ConMan
* {{Expy}}: Of [[http://tvtropes.org/pmwiki/pmwiki.php/Recap/ThePowerpuffGirlsS4EP6 Dick Hardly]]. Sleazy, blond, manipulative and [[spoiler: sells poor products.]]
* HorribleHollywood: He's a Hollywood agent that was going to [[spoiler: keep Bloo as his slave.]]
* ManipulativeBastard: He takes advantage of Bloo's jealousy towards Eduardo for being in commercials.
* MonsterOfTheWeek: Only appeared in "Sweet Stench Of Success" in which he was the main antagonist.
* SinisterShades: A ConMan who wears shades.

!Imaginary Friends

[[folder:Blooregard "Bloo" Q. Kazoo]]
->'''Voiced by:''' Creator/KeithFerguson

Mac's reckless, hyperactive imaginary friend. Mac's complete opposite; however without him, Mac would do everything Bloo says and does.
* AcquaintedWithEmergencyServices: In Season 2, "My So Called Wife", he and several other people are thrown in jail for a night after a phony benefactor threw a fake gala in someone's mansion without permission and the owner has everyone arrested for trespassing. Everyone was released from jail in the morning leading to him saying goodbye to the police officer.
-->'''Mac''': What a crazy night.\\
'''Bloo''': Eh. I had worse. ''(to a police officer)'' Good seeing you again, Charles. Say hi to the kids for me.\\
'''Charles''': Will do, Bloo.
* AttentionDeficitOohShiny: Put a paddle ball in his sight, don't expect to hear from him for a while.
* AttentionWhore: If everyone's attention is somewhere else, he'll do everything he can to bring it back to him.
* BigEater: He tends to have a huge appetite for junk food like burgers, fried chicken, cheese fries, pie, chocolate cake, tacos, whipped cream, ice cream, juice boxes, chips, soda and his favorite, pizza.
* BrattyHalfPint: He's whiny, selfish, and complains when he doesn't get what he wants (Especially when [[ExtremeDoormat Wilt]] game him the wrong type of chips, though fortunately this [[BewareTheNiceOnes forces Wilt to snap]].)
* CharacterizationMarchesOn: The Pilot shows him to be much friendlier, with a few snarky qualities and seeming to have a generally good grasp on things.
* ComicallySmallBribe: Bloo will frequently try and buy others off with pocket change.
* DeadpanSnarker: Bloo often makes sarcastic remarks, yet he didn't even ''know'' what sarcasm is back in "My So Called Wife".
* {{Deuteragonist}}: The main secondary focus, though he switches between this and being TheProtagonist with Mac very often.
* EveryoneHasStandards: Bloo may be a {{Jerkass}}, but even he can't stand how snooty and bitchy Duchess is.
* {{Flanderization}}: He started out being very protective of Mac. Then he became a JerkWithAHeartOfGold in season one, more of a {{Jerkass}} in season two, and by the later seasons, some fans were wishing that Mac would just ''leave'' Bloo already.
* TheFriendNobodyLikes: Mac (his creator) genuinely likes him; at best the others tolerate him due to Proximity and Supervision.
* HeroesWantRedheads: His (very shallow compared to Mac's) crush on Frankie.
* HeterosexualLifePartners: With Mac.
* HiddenHeartOfGold:
** When he thought that [[spoiler:Eduardo had died]] he was devastated, and said nobody else deserved to be him. [[spoiler:When Eduardo came back to Foster's,]] he acted like he normally did, and said he didn't miss him at all. [[spoiler:When everybody else left, Bloo hugged Eduardo, and told him he missed him.]]
** After Mac, who has been blamed for Bloo disregarding the rules of not allowing Goo into fosters, is told by Frankie and Mr. Herriman (politely) that he is no longer welcomed at Fosters, while everyone else on the bus gives Mac a sympathetic look, Bloo's expression to Mac says as clear as crystal that he is truly sorry for what he did to him.
* InnocentlyInsensitive: Played with. He's far from being innocent and became a progressively bigger jerk to others up until near the end, but it's sometimes implied that Bloo - much like a very young or immature kid - honestly might not understand just how selfish or mean-spirited his actions and behavior can actually be, let alone the potential consequences of them, and only near the finale did he actually start getting some awareness of it.
* ItsAllAboutMe: Frequently prone to wondering aloud why no one is focusing on him. Doubles as AttentionWhore.
* {{Jerkass}}: Bloo becomes a bigger jerk each week, though he seemed to be leveling off at the end. The TV movie (where Wilt is trying to find his original creator) implies that the "negative" aspects of the imaginary friends are an unconscious SecretTestOfCharacter for their kids: Wilt's ExtremeDoormat-ness encouraged his boy to be a better sportsman while Eduardo's meekness made his girl - a future policewoman who dreamed him up to be her protector - be more courageous. Thus, Bloo's Jerkassness shows Mac how not to treat [[strike: his friends]] everybody.
* JerkassHasAPoint: In "Partying is Such Sweet Soiree", when Mr. Herriman chews him out for throwing a wild party while Madame Foster was away when she forbade it, Bloo points out to Mr. Herriman that he'll get in trouble when Madame Foster returns as well because he promised no wild parties would happen under his watch. While it was Bloo's fault Mr. Herriman left the house without his supervision in the first place, Bloo was still right about Mr. Herriman not doing his job by keeping things under control.
* JerkWithAHeartOfGold: In the earlier seasons, and occasionally in the later seasons.
* JerkWithAHeartOfJerk: In later seasons. Even when he helps his friends, there's some shallow, selfish motive being his actions.
* KarmaHoudini: Most of the time. Especially in the example where he stole the bus, at the end where a Bloo clone is getting chewed out by Frankie for all the trouble he caused, the real Bloo is sneaking off with the bus again. He also is never discovered to have actually been the one who was repeatedly letting Goo into Fosters the whole time instead of Mac, nor does he receive a comeuppance.
* LargeHam: He's pretty dramatic at times.
* ManipulativeBastard: Say what you will about his maturity level, but Bloo's silver tongue is one of his most consistent traits. The guy can talk his way into a favorable position in just about any situation he finds himself in.
* MarsNeedsWomen: He temporarily develops a crush on Frankie in "Frankie my Dear".
* {{Narcissist}}: He is very self-centered.
* ObliviousToLove: Is completely oblivious to Berry's stalker crush on him. In fact, he can never remember her name or in some cases, ''her existence''.
* OutgrowingTheChildishName: Parodied in "The Bride To Beat". Fearing that Mac'll outgrow hin, Bloo decides to act like an adult. This includes changing his name from "Bloo" (short for "Blooregard") to "Bob".
* PetTheDog: Even post {{Flanderization}}, he still sometimes shows his soft side such as apologizing to Coco after realizing how much of a jerk he acted as in ''Cuckoo for Coco Cards'' or missing Coco, Ed, and Wilt when they all move out of the room in the end of ''Room With a Feud''.
* PrecisionFStrike: In a mostly G-rated series, he tells Mr. Herriman in "Imagination Destination" after he asks what's going on "You pissed him off, that's what!" According to the voice actor, it may also have been a ThrowItIn moment.
* RedOniBlueOni: The red to Mac's blue. Ironic, no?
* SarcasmBlind: Quite literally, even when ''he's'' being sarcastic. Mac and Frankie have to actually teach it to him (with mixed success).
* {{Schemer}}: He quite often comes up with a plan to satisfy his own self-centered interests and goals.
* ScreamsLikeALittleGirl: He already has a high-pitched voice as is, but when he screams, it becomes even squeakier.
* SendInTheClones: In "Bloo's Brothers".
* SensitiveGuyAndManlyMan: The Manly Man to Mac's Sensitive Guy.
* SmallNameBigEgo: Somewhere along the line, he got the idea that he was the greatest imaginary friend ever. Needless to say, he really isn't.
* SmartBall: Held this in ''Trouble With Scribbles'', being quick to find out how the scribbles worked and how they could be helpful rather than nuisances. Due to his selfishness however, it was Mac who actually shared this knowledge with the rest of the house.
%%* SmugSnake
* TookALevelInJerkass: After the pilot episode, Bloo became more self-centered and rude.
* TrademarkFavoriteFood: Pizza. He orders it frequently and he eats or mentions pizza more often than other foods.
* {{Tsundere}}: A MAJOR type A. His nice side only comes out with Mac, and only if prompted.
* UnsympatheticComedyProtagonist: Bloo's a selfish jerk to everyone.
* VillainProtagonist: At his worst. But even at his worst he's only ever an AntiVillain.
* VitriolicBestBuds: With [[NiceGuy Mac]]. Not in the pilot, but in the rest of the series.
* VocalEvolution: Seems to be a byproduct of the {{Flanderization}}; as his voice got more nasally and whiny, his personality degenerated into {{Jerkass}}.


->'''Voiced by:''' Creator/PhilLaMarr

A one-armed imaginary friend desperate to be a nice person and gain acceptance. Is that okay?
* {{Adorkable}}: He's clumsy, friendly, and apologetic.
* AllOfTheOtherReindeer: Most of the other Friends take advantage of his kindness remorselessly. Downplayed, as they seem to like him just fine, they just can't resist making him do ridiculous things for them.
* ApologisesALot: Half of his dialogue starts with "I'm sorry, but that is not okay!" or at least some variation of "I'm sorry, but...."
* BerserkButton: Wilt is not a fan of height jokes.
* BewareTheNiceOnes: [[{{Jerkass}} Bloo's]] selfish requests causes him to repeatedly shout "no", ''while in an angry tirade''. [[spoiler: Unfortunately, this doesn't last long, after accidentally saying "sure" to ''another'' one of Bloo's selfish requests.]]
* BigBrotherMentor: He can be this to Eduardo. He was also this to his creator.
* BreakTheCutie: Dear lord, his backstory.
* CannotTellAJoke: Not even when reading them off of a cue card.
* {{Catchphrase}}: "Is that okay?"
* ChestInsignia: The number 1 on his torso.
* CoolBigBro: The best guy to have as a basketball buddy, but unfortunately [[DeconstructedTrope his caring nature]] [[TheWoobie is exploited on one too many occasions.]] It's also implied that he was this at one time to Frankie due to his being markedly older than her (and on a few occasions, still is).
* ExtremeDoormat: The poor guy just can't say no to a request for help. Even if he does, it's after he's been pushed around too many times.
* FashionableAsymmetry: Wilt is missing his left arm, and his left eye is small and deadened compared to his right.
* GentleGiant: He's very tall and also quite amiable.
* HeroicSacrifice: [[spoiler:Wilt through the basketball game in order to save his creator from being crushed under the rival imaginary friend. Wilt lost his arm, his left eye, and the game in the process of saving a life]].
* MeaningfulName: Named after UsefulNotes/WiltChamberlain.
* MyGreatestFailure: ''Good Wilt Hunting'' reveals his greatest shame. [[spoiler:Losing a basketball game with his creator, who at the time took it hard. Wilt felt so ashamed he ran away]].
* NamedAfterSomebodyFamous: Is named after famous and famously tall UsefulNotes/WiltChamberlain, which refers to his love for basketball and being a GentleGiant.
* NiceGuy: Somewhat {{deconstructed}}; his niceness is constantly exploited.
* ReasonableAuthorityFigure: Even though 99% of the time he's fine with being childish and goofy like one of the kids, there are moments where he does stand his ground and reminds everyone, including the viewers, that he's one of the adults in the Foster's house.
* ScarsAreForever: [[spoiler:As a result of a HeroicSacrifice he made when he and his creator were younger.]]

->'''Voiced by:''' Creator/CandiMilo

A palm-tree/aeroplane imaginary friend with a language based on her own name.
* AbnormalAmmo: Of sorts, she lays eggs that can hold anything from bubbles to an anvil, so they could easily be used as weapons if there's something heavy enough in them.
* BalloonBelly: She's actually really self-conscious about it.
* BilingualDialogue: She'll talk in her PokemonSpeak, the characters will respond with normal language.
* CargoShip: In-universe; she's shown affection towards a lamp and a mop.
* {{Cloudcuckoolander}}: She has pretty strange beliefs and quirks, like the aforementioned falling for a lamp and mop.
* DarkAndTroubledPast: While it's never stated in-universe, WordOfGod says that Coco was created by a little girl that was stranded on a desert island. This explains Coco's bizarre appearance (body = plane, face = palm tree, lips/beak = deflated raft), her insanity, and her willingness to protect others. Made even more apparent if you take a closer look at her aeroplane body: it looks almost crumpled up in places, as a plane would look if it had ''crashed.''
* HappilyAdopted: Her real creator is unknown, but she was found and took in by two guys who appreciated her bizarre nature.
* HiddenDepths: Despite her weirdness, Coco seems to be the most resourceful and practical member of the clique, often coming up with the right solution in a pickle.
* InterspeciesRomance: She briefly shacks up with a yeti in "Mondo Coco".
* TheLoonie: There's no rhyme or reason to what she does or mumbles. It's not clear if she's just doing it for laughs or she's just insane.
* MurderIsTheBestSolution: While we can't really be sure, there have been three instances when her suggestions against a problem involve something that Mac and Frankie said "would get them into jail" or "be illegal", respectively.
* NiceGirl: Most of the time Coco is good-natured.
* OutOfFocus: Season 5
* PokemonSpeak: All she can say is "CoCo" Oddly enough, she can only ''write'' Coco as well.
* RealityWarper: Sometimes. The only reason this case is noteworthy is the fact that she's the only ''imaginary friend'' who seems to do this.
* TheUnintelligible: Zig-Zagged. The audience can't understand her, but the main cast sometimes can and sometimes can't.

->'''Voiced by:''' Creator/TomKenny

An imaginary friend resembling a huge, hairy monster who has an infantile mind and is scared of everything.
* {{Adorkable}}: Super friendly, and incredibly kooky.
* BilingualBonus: Occasionally, he uses Spanish words in his dialogue, and has a Hispanic accent. Understandable considering that his owner is Hispanic.
* BerserkButton: Just don't mess with his friends... (or former owner) And while he may act like a crybaby, he does ''not'' like being treated like a baby.
* BewareTheNiceOnes: Cowardly and soft though he may be, when pushed, Eduardo makes it very clear that he's one of the strongest characters in the show.
* BigOlUnibrow: He has a giant unibrow over his eyes.
* {{Cloudcuckoolander}}: He can be rather absentminded.
* CowardlyLion: [[spoiler:Having a protector backfired. Instead of teasing her, the bullies started to attack Ed, who was too cowardly to defend himself, despite his looks.[[note]]She eventually got sick of it and lashed out the bullies in return, and began to protect Ed instead of vice versa.[[/note]]]] Ed's a natural cry-baby, and refuses to go into a situation unless someone's beside him or he's in a group, and even then he's not going to be happy.
* CuddleBug: Gives (nearly bone-crushing) hugs to people he's worried about.
* DoesNotKnowHisOwnStrength: And with his hugs come complaints of wanting to be let down.
* FaceOfAThug: He looks like a savage beast when he's anything ''but''.
* GentleGiant: [[spoiler:His owner, now a grown police officer, made him to not only have a playmate as well as protector from bullies, but to also have someone who was gentle enough to play with her baby brother.]]
* GratuitousSpanish: He peppers Spanish phrases into his dialogue. In his case, English appears to be his second language, so he drifts in and out of it.
* MeaningfulName: His name is Spanish for 'Edward' which in English means 'wealthy guardian'. The latter applies to how he's always protective of his friends and [[spoiler: how he was originally created to protect both his creator and her little brother. The ending and credits to 'The Buck Swaps Here' reveals that Eduardo is more wealthy then he leads on]].
* NeverTrustATrailer: A variation. On the show's slowly-growing character pages on Cartoon Network's site long before the pilot was aired, after the bright and colorful characters (Mac, Bloo, Wilt, and Coco) were trotting happily across the screen, Eduardo was seen running furiously toward the camera. At that moment, it actually seemed like he was the ''villain'' of this show! But when his character page on the site finally came around, it makes it clear he's anything but.
* NiceGuy: Is one of the most gentle friends in the entire house, despite his menacing appearance.
* PapaWolf: Don't hurt his friends or he'll attack.
* SecretlyWealthy: It's revealed at the end of an episode that Eduardo has a safe full of riches he keeps in his toy chest. [[HiddenDepths Turns out he's made a lot of smart investments]].
* SuperStrength: He is capable of carrying a bus around as if it wasn't even there. [[StoutStrength Though considering his size...]]
* TrademarkFavoriteFood: Potatoes, to the point that he curiously carries around a potato sack wherever he goes.

[[folder:Mr. "Funny Bunny" Herriman]]
->'''Voiced by:''' Creator/TomKane

Madame Foster's imaginary friend; a Victorian, upper-class rabbit obsessed with maintaining order.
* AntiquatedLinguistics: He talks like a 19th Century English gentleman.
* BerserkButton: Mr. Harriman does not like having his secrets revealed to the world as shown in World Wide Wabbit.
* BlindWithoutEm: His monocle. Without it, he can't see anything. Presumably, he's blind in the eye that doesn't have a glass on it.
* BritishStuffiness: His accent serves to emphasize how tightly wound he is. He even provides the trope image.
* ColdTurkeysAreEverywhere: His addiction to carrots.
* TheFinickyOne: He's almost completely devoid of humor and is constantly stressed out about something.
* GracefulLoser: Mr. Herriman is not above admitting when he has been defeated by his competition fair-and-square or admitting when he's wrong. In ''Setting a President'', for instance, when Frankie beats him by a landslide for the position of Foster's Home President, not only was he willing to admit defeat, Herriman didn't even kick up a fuss about being beaten. In fact, since he lost his position to Frankie, ''[[ButNowIMustGo he chooses to leave Foster's altogether]]'', despite Frankie saying that he doesn't have to leave Foster's. Thankfully, this sad predicament doesn't last too long as Frankie realizes that being house president isn't all that it's cracked up to be and gives Herriman back his position.
* HeroAntagonist: His desire to enforce the rules and keep the order of Foster's Home puts him in conflict with Blue more often than not.
* HighClassGlass: His monocle.
* JerkWithAHeartOfGold: He genuinely loves Madame Foster and children in general. However, he prefers to keep it hidden behind a stuffy no-nonsense exterior, as evidenced in "World Wide Wabbit"
* LiteralMinded: Enough to get the entire house locked outside of their new security system because he interpreted "enter a random number" on the PIN pad to mean "enter a random number ''every time''".
* MeanBoss: Poor Frankie.
* NiceHat: His top hat.
* NotSoAboveItAll:
** In "Cookie Dough", Bloo manages to con him into betraying Madame Foster and getting him the cookie recipe.
** In "Beat with a Schtick", he forgoes his initial expulsion of Bloo--despite the latter's numerous confessions--in favor of letting him get beat to a pulp by the new guy. He does this almost immediately after saying that getting into a fight was "a direct violation of house charter."
** In "Bloo Done It", he's just as excited by Uncle Pockets' return to Foster's as everybody else and doesn't even try to hide it.
* ObstructiveBureaucrat: Can sometimes come off this way.
* RhymesOnADime: His highly entertaining "Sweet Little Girl" routine.
* SuperOCD: He can't stand anything being out of place or disorganized.
* TrademarkFavoriteFood: Carrots. He's quite addicted to it.
* TheyChangedItNowItSucks: {{invoked}} After finding out that people genuinely enjoyed his Funny Bunny routine, he tries to update it for modern audiences, not understanding that what people found joy in was the charming and sweet (and funny) was the nursery-rhyme like feeling of the original. It's implied that afterwards the reaction was RuinedFOREVER as there are no further mentions from the public of "Funny Bunny" (or perhaps like all viral YouTube videos, it faded after a few months, either way it's implied that the hip hop update never caught on). Although in a later episode, they mention the original (reuploaded to YouTube) has over 12 million views, so perhaps the original Funny Bunny routine still was popular.
* WellIntentionedExtremist: Most of his strict rules revolve around not wasting resources (As it's a common plot that Fosters' budget is very tight) and simply trying to keep a semblance of order in a building filled with some rather wacky creations.
** He has been shown to be a ReasonableAuthorityFigure at times, notably when Bloo accidentally knocked over a bust of Madame Foster and was terrified that Herriman would throw him out. Herriman instead calmly explained to him that he does not punish innocent mistakes, and that people have been knocking that bust over for years, [[CrazyPrepared even keeping a closet full of them]].
* WhyDidItHaveToBeSnakes: Has a fear of dogs in "Who Let The Dogs In?", due him to being based on a prey animal. So great is his fear that [[OOCIsSeriousBusiness he even called out "Frankie" instead of "Ms. Francis"]].

->'''Voiced by:''' Creator/CandiMilo

A [[MeaningfulName cheese-based]] imaginary friend with a childlike disposition; likes chocolate milk and cereal.
* AmbiguousDisorder: At times, he acts as if he has a mental disability.
* AnnoyingYoungerSibling: He acted like this to Bloo in his debut, annoying him with his idiocy, but he turns out ''not'' to be Bloo's brother when it's revealed that he is Louise's imaginary friend.
-->'''Cheese:''' WE ARE BROTHER LADIES.
* {{Cloudcuckoolander}}: He has a history of unusual behaviors.
* TheDitz: Cheese is incredibly dumb.
* {{Flanderization}}: From a "four-year-old with special needs" to "barely sentient baby", by only his '''''second major appearance!'''''
* GeniusDitz: [[spoiler: He has a good memory]].
* MeaningfulName: "Cheese" is an appropriate name for an imaginary friend who has a yellow complexion and an apparently unpleasant odor.
* TheMillstone: With the trouble he's known to inadvertently cause, it's a wonder why he's never turned away.
* PunnyName: A variant; cheese puns are invoked whenever he's paired with someone. "Mac and Cheese", "Bloo Cheese" and "Cheese Louise" are mentioned in his introductory episode.
* PunctuatedForEmphasis:
** "I. Like. ''Cereal''."
* RedEyesTakeWarning: Subverted. He's mostly harmless. At worst, he's just annoying.
* SmallAnnoyingCreature: He's a short feller and he often annoys the other characters.
* SweetTooth: He likes chocolate milk.
* TalkativeLoon: Prone to saying silly and weird statements at random. ''"I'm a horsey!"''
* TrademarkFavoriteFood: Chocolate milk...we ''think''. He refers to every food at chocolate milk. Also seems to like cereal (we think?).

->'''Voiced by:''' Music/GreyDeLisle

A small, cute imaginary friend with a dangerously obsessive crush on Bloo.
* AxCrazy: She doesn't take it well at all when Bloo doesn't return her affections and becomes psychotically obsessed with doing anything she can to get them together.
* BerserkButton: Whenever Berry feels like someone attempts to sever her ties with Bloo. Berry gets all fired up whenever she just sees Mac.
** Berry sees a friend take away Bloo's seat at the dinner table.
--->'''Berry:''' (''in a very soft voice''): Oh, I'm sorry. That seat's taken.
--->'''Uninvited guy:''' I'll just be a minute.
--->'''Berry:''' (''explodes'') [[MoodWhiplash THAT SEAT'S TAKEN!!!]] (''guy runs away'')
* BewareTheNiceOnes: She seems nice and cute at first glance. However, once she becomes involved with Bloo, she goes full {{Yandere}} on him.
* ClingyJealousGirl: She's so possessive towards Bloo that even his best friend, Mac, poses a threat to her "relationship".
* CuteAndPsycho: A cutesy imaginary friend who isn't right in the head.
* FunWithHomophones: The alias she uses for her rich kid disguise in "Affairweather Friends" is Barry, which results in confusion on Bloo's part when Mac tries to explain to him that the two are the same person.
* GenkiGirl: She's excitable.
* HoistByHisOwnPetard: She tries to run over Mac, who is tied to the World's Largest Rubber Band Ball, with a train. Thanks to Bloo [[IdiotHero thinking for once]], she misses and ends up stuck on it herself and bouncing off into the distance.
* LatexPerfection: Her disguise as a rich kid named Barry in "Affairweather Friends" is fairly convincing.
* LoveAtFirstSight: With Bloo.
* LoveMakesYouCrazy: She became a {{Yandere}} after meeting Bloo.
* MurderTheHypotenuse : In ''Berry Scary,'' she [[DownplayedTrope merely tries to keep Mac out of her way]]. Played completely straight in ''Affairweather Friends''.
* OhNoNotAgain: After once again being sent away on a giant rubber band ball at the end of "Affairweather Friends", she screams "Why does this keep happening to me?"
* PinkGirlBlueBoy: She's the pink girl to Bloo's blue boy.
* StalkerWithACrush: Ever since she arrived at Foster's, she has been following Bloo everywhere. Within the span of a few ''days''.
* StepfordSmiler: A Type C variant.
* StrawFan: She was made as a TakeThat to ''WesternAnimation/ThePowerpuffGirls'' Shippers.
* VillainousBreakdown: She has one after Mac and Bloo strap her to a giant rubber band ball. She rages about how everything was supposed to be for her and Bloo and yet, Mac ruined it all. Oh, and she also snaps after Bloo gets her [[RunningGag name wrong again]].
* {{Yandere}}: She's very doting on Bloo, but she flies off the handle if anyone gets in her way or even annoys her.
* YouWouldntLikeMeWhenImAngry: Let's face it. She is a girl with a [[DemonHead dark side]]. 'Cause when she's happy, her teeth are not doing anything and she has a '''HUGE''' smile on her face. But when she's angry, [[BewareTheNiceOnes get away from her,]] because [[ScaryTeeth she has lots of sharp teeth that she could bite you with]]! Also, when she screams, she screams [[BrokenRecord for a long time]], but only when she is [[ExactlyWhatItSaysOnTheTin strapped to the rolling rubber band ball]].

[[folder:Duchess Diamond Persnickety]]
->'''Voiced by:''' Music/GreyDeLisle

An ugly, snobbish and downright mean aristocratic imaginary friend.
* ZeroPercentApprovalRating: Not ''one'' person in the series likes her at all and she has been passed up for all adoptions [[spoiler: except by the Applebees, who unfortunately live right next door to Mac]].
* AristocratsAreEvil: It's not clear if she's actually a "duchess" or if it's just a name. She's definitely evil, though.
* ArtInitiatesLife: Possibly, considering she looks like a Picasso painting. This may be intentional, as in the few instances where she shifts her pose she's shown to be completely flat as though she were an actual artpiece.
* BigBadDuumvirate: With Terrence in the first episode.
* FluffyTamer: Can exert near-perfect control over an Extremosaur in the first episode. She speaks to it affectionately with BabyTalk to boot.
* HateSink: Her entire purpose on the show is her being a spoiled snob who bosses the others around and has little respect for anyone around her.
* ItsAllAboutMe: In the pilot, she plots to kill Bloo simply because the daughter of a rich family wanted him instead of her. That's pretty normal behavior for her.
* {{Jerkass}}: She's such an unpleasant person that she makes Bloo look like a saint.
* PetTheDog: Even Duchess can't bring herself to hate Uncle Pockets. When Bloo interviewed her in the hopes of finding ''someone'' willing to slander him, she calmly replies "Eh, tolerable." Seems small, but coming from Duchess, that's a pretty big compliment.
* RichBitch: She acts the part, but she's an imaginary friend so she doesn't have any real money.
* SmallNameBigEgo: Her full, self-styled title is Her Royal Duchess Diamond Persnickety, the First, Last and Only. She clearly thinks ''way'' too much of herself.
* SmugSnake: She thinks that she's perfection. Nothing could be further from the truth.
* TheStoolPigeon: In the episode "Partying is Such a Sweet Soirée".
* ThatCameOutWrong: In the pilot, she suggests to Mac's brother Terrence that they work together, but the way she puts it grosses out Terrence because he mistakes it for Duchess coming on to him.
-->'''Duchess''': You and I should hook up!
-->'''Terrence''': Oh, man! I think I'm gonna be sick!

[[folder:Jackie Khones]]
->'''Voiced by:''' Creator/PhilLaMarr

A small, green, furry imaginary friend with a deep voice, one eye, and a cool personality.
* AscendedExtra: Started out as a minor background character before being given more focus.
* BadassBaritone: His voice is very deep.
* {{Cyclops}}: His entire head is a single eye.
* DeadpanSnarker: Has a dry wit.
%%* ItsAllAboutMe
* {{Jerkass}}: He's selfish and obnoxious.
* OfficialCouple: With Fluffer Nutter. Maybe. This is hinted in three episodes, and they were also seen dancing together at the UsefulNotes/MacysThanksgivingDayParade in 2007 and 2008.
* SmallNameBigEgo: He thinks he's better than everyone else.
* TrademarkFavoriteFood: Sandwiches.
* UnknownRival: Has something against Wilt. A lot of things. If he dies, he wants to divide all his belongings between the house--except for Wilt. That sucker don't get squat.
* VocalDissonance: A small imaginary friend with a very deep-sounding voice.

[[folder:Imaginary Man and Nemesis[[spoiler:ter]]]]
->Voiced by: Daran Norris and Grey [=DeLisle=]

A superhero imaginary friend and his arch nemesis, a supervillainess imaginary friend. [[spoiler:It turns out that they're actually siblings, created by siblings as a fun outlet for their sibling rivalry]].
* AbnormalAmmo: Nemesis uses flowers rather than arrows against Imaginary Man.
* AchillesHeel: Nemesis' hair and Imaginary Man's masculinity.
* AffablyEvil: Nemesis.
* ArchEnemy: To each other. [[spoiler:Though it's implied that it's all just a game]].
* AwLookTheyReallyDoLoveEachOther: [[spoiler: If anyone but each other attack them, they'll drop their act and become concerned for their safety. ]]
* CainAndAbel: [[spoiler:Subverted. They don't hate each other, they just embody a childish sibling rivalry]].
* {{Catchphrase}}: As Mac constantly tries to come up with his own catchphrase as Imaginary Man's sidekick, Imaginary Man responds to the poor choices with, "keep trying Mac-Attack."
* TheCorrupter: Nemesis was able to convince Bloo to temporarily become her [[TheDragon Dragon]] Uniscorn.
* FemmeFatale: Nemesis.
* FlyingBrick: Imaginary Man.
* {{Gasshole}}: One of Imaginary Man's powers is the "Atomic Belch".
* HypocriticalHeartwarming: Imaginary Man stopping Bloo from attacking Nemesis, because [[spoiler:nobody pulls his Neme''sister's'' hair but him!]]
* ImpossibleHourglassFigure: Nemesis.
* JerkWithAHeartOfGold: [[spoiler:Nemesister cares for her brother, and everything is just sibling rivalry]].
* KryptoniteFactor: Anything that damages Imaginary Man's masculinity, though flowers are the most commonly exploited. On the flipside, Nemesis is weakened by anything that damages her hair.
* LightIsNotGood: Nemesis' powers are based in stereotypical femininity, just as Imaginary Man's are based in stereotypical masculinity. Thus, a lot of her evil-doings involve a motif of hearts, flowers and the color pink.
* ManChild: Both of them, behaving like stereotypical children of each gender despite having adult bodies.
* PunnyName: [[spoiler:Nemesister, a {{portmanteau}} of her usual title Nemesis, and Sister]].
* SiblingRivalry: [[spoiler:Created through one, presumably to act as a more playful outlet to channel said rivalry]].
* SuperheroesWearCapes: Imaginary Man.
* WhamLine:
-->'''Imaginary Man''': ''(after saving [[spoiler:Nemesis]] from an angry Bloo)'' [[spoiler:Nobody pulls my Neme''sister's'' hair but ME!]]

-> Voiced by Max Burkholder
An imaginary friend connected to another dimension connected to a toy chest. He's terribly lonely and abducts Frankie to be his friend.
* BigBad: Of ''Destination Imagination''
* DimensionLord: He controls everything inside of his toy chest.
* IJustWantToHaveFriends: His one motivation.
* TheFaceless: Everything in his dimension lacks a face. He controls them by sliding into place as their face.
* HeelFaceTurn: [[spoiler:Once he's promised genuine friendship, he drops all hostility]].
* MadnessMantra: "No you don't no you don't now you ''DOOOON'T''!"
* OneWingedAngel: A mishmash of various toys to become a giant monster.
* VillainousBreakdown: Mr. Herriman's chewing him out causes the kid to hyperventilate and enter OneWingedAngel mode.

[[folder: Bendy]]
-> Voiced by Creator/JeffBennett
Bendy is an imaginary friend who is yellow with black stripes. He was brought to the house after his child's parents couldn't take his trouble making anymore. Frankie and Mr. Herriman thought that it might just be his kid blaming him which is apparently very common, but in truth it really was Bendy.
* BitchInSheepsClothing: In front of Frankie and Mr. Herriman, he puts on the mask of being a misunderstood and sympathetic NiceGuy who's always being blamed for other people's misbehavior, but takes great relish in framing others for his bad deeds when they aren't around.
* CrocodileTears: Used these to manipulate Frankie and Mr. Herriman.
* HateSink: He was simply added in the episode he appears in just to be despised by the audience.
* {{Jerkass}}: Did nothing but cause havoc in the home and framed Bloo and his friends for it.
* KarmaHoudini: One of the most infamous examples in the series. Despite Bloo and his friends fighting tooth and nail to catch him, he gets away in the end when Bloo reveals that he planned to get Bendy in trouble. However, since he doesn't appear in any other episodes, one can assume he was eventually found out and was kicked out offscreen.
* KickTheDog: Bendy telling Bloo that he knowingly used ''his'' toothbrush ''to scrub the toilet''.
* MonsterOfTheWeek: He only appeared in the episode "Everyone Knows It's Bendy", where he was the antagonist.
* PutOnABus: Understandably, the above tropes ensured that this was his fate as the audience was all too eager to see him gone.