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



->'''Voiced by:''' Sean Marquette

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
* AuthorAvatar: Creator Craig [=McCracken=] based Mac on himself as a child.
* {{Adorkable}}
* AllLovingHero
* 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...
* BerserkButton: He does not like having his secrets revealed to the world as shown in World Wide Wabbit.
* BigEater: Only when it comes to sugar.
* 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.
* CheerfulChild
* ChivalrousPervert: The pervert part is implied, the chivalrous part is clear-as-day.
** 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.
* TheConscience
* TheCutie
* DisappearedDad: Mac's father is never mentioned. He just has his [[ParentalNeglect mom]] and [[BigBrotherBully big brother.]]
* EarlyInstallmentWeirdness: 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...
* GRatedDrug: NEVER give Mac sugar. Seriously.
* HeroesWantRedheads: His crush on Frankie.
* IncorruptiblePurePureness: Best seen in "Affair Weather Friends". He would never act with selfish, greedy motives to sell his [[JerkAss jerkass]] friend.
* JerkassBall: When he gives Goo a mean TheReasonYouSuckSpeech, which makes [[CloudCuckoolander Goo]] cry. Thankfully, he makes it up with a heart-to-heart talk and apologizing.
-->'''Mac:''' I don't like you! Not a person in this house likes you either! You're odd, talk in a weird way and really fast for that matter! Mr. Herriman is a rabbit, NOT a badger! Bloo's name isn't Chester, it's Bloo, bannanas don't contain protein you numbskull, nuts do! But you don't need anymore nuts since you're nuts! You're the place where they keep all the nuts! It's contagious! You spread the nuts to everyone in this house! Everybody thinks you're a nuisance and they all want you to just GO HOME!
-->'''Goo:''' [[TheWoobie (runs off in tears)]]
* MasculineGirlFeminineBoy: The Feminine Boy to Frankie's Masculine Girl.
* NiceGuy
* 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 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.
* MyGodWhatHaveIDone: while Mac said that because he was so steamed, he looked in the present Goo was about to give him. [[spoiler:Turns out she gave him a new backpack to replace the one that was rendered unusable at the start of the episode]]. Needless to say, Mac realized he shouldn't have snapped and apologized to Goo.
* 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
* TheProtagonist: He's primarily the main character, though he switches between being the protagonist or deuteragonist with Bloo.
* TheReasonYouSuckSpeech: Delivers one to Goo in "Go Goo Go". Doubles as JerkassBall and 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
* SquishyWizard
* 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
* 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:Francis "Frankie" Foster]]
->'''Voiced by:''' GreyDeLisle

Granddaughter of Madame Foster; caretaker at the mansion.
* AlliterativeName: '''F'''rancis '''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.
* 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
* 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 of DudeNotFunny moments that culminate 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)
* DeadpanSnarker
* 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 taken her for granted and then institutes a system where the work is divided fairy among the housemates.]]
* FieryRedhead
* 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
* 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
* RedheadInGreen
* 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.
* 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.
* CoolOldLady
* GenkiGirl
* TheGhost: For most of the pilot movie, to the point where Bloo assumed she was dead.
* MiniatureSeniorCitizens
* MoralityPet: To Mr. Herriman, in a sense.
* OutOfCharacterMoment: 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.
* {{Troll}}: While she's a very nice and wise person, she also deeply enjoys messing with people and watching chaos unfold.

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

An extremely talkative girl who has imagined LOTS of friends.
* {{Adorkable}}
* AttentionDeficitOohShiny
* CloudCuckoolander
* EmbarrassingFirstName: Would you be okay with the fact that your name is "Goo?"
* EverythingsBetterWithRainbows
* 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
* MsImagination
* MotorMouth
* NiceShoes
* 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
* 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:''' TaraStrong

Mac's evil 13-year old brother, and one of the antagonists of the series.
* BigBadDuumvirate: With Duchess in the first episode.
* BigBrotherBully
* CainAndAbel: The Cain to Mac's Abel.
* ClosetGeek
* CrossDressingVoice
* 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.
* TheDitz
* {{Expy}}: Of [[WesternAnimation/ToyStory Sid Phillips]].
* HiddenDepths: Who'd have guessed that [[BigBrotherBully Terrence]] of all people would be [[DaytimeDramaQueen a fan of]] ''[[SoapWithinAshow The Loved and the Loveless]]''?
* {{Jerkass}}
* {{Leitmotif}}: He always has a metal theme play when he shows up.
* MusclesAreMeaningless
* OutOfFocus: In seasons five and six.
* TeensAreMonsters

[[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
* MaleGaze
* 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.

!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.
* AttentionDeficitOohShiny: Put a paddle ball in his sight, don't expect to hear from him for a while.
* AttentionWhore
* BigEater
* BrattyHalfPint
* 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
* {{Deuteragonist}}: The main secondary focus, though he switches between this and being TheProtagonist with Mac very often.
* {{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.
* 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.]]
* ItsAllAboutMe: Frequently prone to wondering aloud why no one is focusing on him.
* {{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 Secret Test of Character 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.
* 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.
* LargeHam
* ManipulativeBastard
* MarsNeedsWomen: He temporarily develops a crush on Frankie in "Frankie my Dear".
* {{Narcissist}}
* 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''.
* 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 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?
* {{Schemer}}
* ScreamsLikeALittleGirl
* SendInTheClones: In "Bloo's Brothers".
* SensitiveGuyAndManlyMan: The Manly Man to Mac's Sensitive Guy.
* SmallNameBigEgo
* SmugSnake
* TookALevelInJerkass: After the pilot episode. The show in general became incredibly cruel and mean-spirited after the whimsical pilot.
* {{Tsundere}}: A MAJOR type A.
* 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.
* {{Adorkable}}
* AllOfTheOtherReindeer
* ApologisesALot
* BerserkButton: Wilt is not a fan of height jokes.
* BigBrotherMentor: He can be this to Mac and Bloo. He was also this to his creator.
* BreakTheCutie: Dear lord, his backstory.
* CannotTellAJoke
* {{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
* GentleGiant
* MeaningfulName: Named after UsefulNotes/WiltChamberlain.
* 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.]]
* WhatsMyLine: Wilt has trouble saying "No" when someone asks him to do something.
** Although, in the episode where Bloo was in trouble with "The New Guy", he says "No", perhaps making it a CompressedVice.

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

A palm-tree/aeroplane imaginary friend with a language based on her own name.
* BalloonBelly
* BilingualDialogue
* CargoShip: In-universe; she's shown affection towards a lamp and a mop.
* CloudCuckoolander
* 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.
* 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.
* TheLoonie
* 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.
* OutOfFocus: Season 5
* PokemonSpeak
* 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

->'''Voiced by:''' TomKenny

An imaginary friend resembling a huge, hairy monster with a heart of gold.
* {{Adorkable}}: Super friendly, and incredibly kooky.
* 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
* CloudCuckoolander: He definitely has his "LOCOOOOOOOOOOOOO!!!!!!!!!!!" moments.
* 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.]]
** CowardlyLion: [[spoiler:However, 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.
* GratuitousSpanish
* 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.
* PapaWolf: Don't hurt his friends or he'll attack.
* 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
* BerserkButton: Mr. Harriman does not like having his secrets revealed to the world as shown in World Wide Wabbit.
* BlindWithoutEm
* BritishStuffiness
* ColdTurkeysAreEverywhere: His addiction to carrots.
* TheFinickyOne
* HeroAntagonist
* HighClassGlass: His monocle.
* JerkAss
* 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."
* ObstructiveBureaucrat: Can sometimes come off this way.
* RhymesOnADime: His highly entertaining "Sweet Little Girl" routine.
* 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: Let's just leave it here.
* AnnoyingYoungerSibling: He acts like this to Bloo.
* CloudCuckoolander: Oh, good Lord, is he ''ever''.
* TheDitz
* GeniusDitz: [[spoiler: He has a good memory.]]
* MeaningfulName
* TheMillstone
* 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
* TheScrappy: InUniverse example. ''Everyone'' is annoyed by his weird antics.
* SmallAnnoyingCreature
* SweetTooth
* TalkativeLoon: ''"I'm a horsey!"''
* TrademarkFavoriteFood: Chocolate milk and cereal.

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

A small, cute imaginary friend with a dangerously obsessive crush on Bloo.
* AxCrazy
* GenkiGirl
* CuteAndPsycho
* BadassAdorable
* ''[[DangerouslyGenreSavvy Dangerously]]'' [[DangerouslyGenreSavvy Genre Savvy]]: Taken UpToEleven in her returning episode ''Affairweather Friends'', where she anticipates Mac and Bloo's every move from the getgo and plans accordingly. Lampshaded by Berry herself in a [[EvilGloating bad guy speech]] [[MotorMouth so long she had to take a deep breath before and after it!]]
* [[HoistByHisOwnPetard Hoist By Her Own Petard]]: 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.
* LoveAtFirstSight
* LoveMakesYouCrazy
* MurderTheHypotenuse : In ''Berry Scary,'' she [[DownplayedTrope merely tries to keep him out of her way]]. Played completely straight in ''Affairweather Friends''.
* 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.
* {{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.
* AristocratsAreEvil: Duh
* ArtInitiatesLife: Possibly.
* 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.
* ItsAllAboutMe
* {{Jerkass}}
* RichBitch
* SmallNameBigEgo: At her worst.
* SmugSnake
* TheStoolPigeon: In the episode "Partying is Such a Sweet Soirée".
* ZeroPercentApprovalRating: Not ''one'' person in the series likes her at all...not even Madame Foster.

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

A small, green, furry imaginary friend with a deep voice, one eye, and a cool personality.
* AscendedExtra
* BadassBaritone
* {{Cyclops}}
* DeadpanSnarker
* ItsAllAboutMe
* {{Jerkass}}
* 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
* 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]].
* 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!]]

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]].
* 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.