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Voiced by: Sean MarquetteA creative, smart, and very warm-hearted 8-year old. Bloo is his imaginary friend.
- Absentee Actor: It is possible that his voice actor (Sean Marquette) was busy with something else during the making of the episode "Pranks for Nothing".
- Adorably Precocious Child" Despite the fact that he's only 8, all of the main cast relies on him for advice and planning. He lampshades it frequently.
- Author Avatar: Creator Craig McCracken based Mac on himself as a child. His mother actually noted on it.
- All-Loving Hero: He's friendly and compassionate with just about everyone. The only exceptions are his brother Terrance and Duchess.
- Ax-Crazy: Mac's personality goes from a very Nice Guy to completely lunatic if he gets even the smallest amount of sugar.
- Badass Adorable: He doesn't "fight" often, but when he does...
- Berserk Button: He does not like having his secrets revealed to the world as shown in World Wide Wabbit.
- Big Eater: Only when it comes to sugar.
- Birthday Hater: 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.
- Break the Cutie: If Bloo is separated from him. Even if Bloo causes his most woobie-ish moments, he becomes an even bigger woobie.
- Cheerful Child: Even if something does get him down, it never keeps him down for very long.
- Chivalrous Pervert: The pervert part is implied, the chivalrous part is clear-as-day.
- The Conscience: For Bloo. Without Mac, Bloo would probably be a complete monster.
- Covert Pervert: 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.
- The Cutie
- Disappeared Dad: Mac's father is never mentioned. He just has his mom and big brother.
- Early Installment Weirdness: 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...
- G-Rated Drug: NEVER give Mac sugar. Seriously.
- Heroes Want Redheads: His crush on Frankie.
- Incorruptible Pure Pureness: Best seen in "Affair Weather Friends". He would never act with selfish, greedy motives to sell his jerkass friend.
- Masculine Girl, Feminine Boy: The Feminine Boy to Frankie's Masculine Girl.
- My God, What Have I Done?: While Mac said what he did(See Rage Breaking Point) because he was so steamed, he looked in the present Goo was about to give him. 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.
- Not So Above It All: 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.
- Only Sane Man: This trope, however, is wonderfully averted if he eats too much sugar.
- Out of Focus: 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)
- Ping-Pong Naďveté: 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 Wise Beyond Their Years 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.
- Precocious Crush: His crush on Frankie.
- Puppy-Dog Eyes: Always on, a combination of the show's art style and the interesting shape of his head.
- The Protagonist: He's primarily the main character, though he switches between being the protagonist or deuteragonist with Bloo.
- Rage Breaking Point: 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 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: (runs off in tears)
- "The Reason You Suck" Speech: Delivers one to Goo in "Go Goo Go". Results in My God, What Have I Done?
- Red Oni, Blue Oni: The blue to Bloo's red.
- Savvy Guy, Energetic Girl: Savvy Guy to Goo's Energetic Girl.
- Sensitive Guy and Manly Man: The Sensitive Guy to Bloo's Manly Man.
- She's Not My Girlfriend: Says this regarding Goo.
- Ship Tease: 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, which he denies.
- Shrinking Violet: Not quite as shy as most examples, but he's still a pretty introverted 8-year-old boy.
- Squishy Wizard: 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.
- Stepford Smiler: In "Go Goo Go" when he has to tolerate Goo's antics, until he finally 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.
- Sweet Tooth: He really likes sugar, but he can't eat it because he'll go on a raging bender.
- Vitriolic Best Buds: With Bloo. Not in the pilot, but in the rest of the series.
- Vocal Evolution: 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 DVD Commentary for "Store Wars", you can hear him (the DVD came out during season five) talk against his higher voice in season one.
- Wise Beyond Their Years: Most of the time, though he can act his age and be as childish as the rest of them Depending on the Writer.
- Your Size May Vary: 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.
Francis "Frankie" Foster
- Alliterative Name: Francis Foster. Also applies with her nickname.
- Almighty Janitor: 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.
- Balloon Belly: The end of "Cookie Dough". Apparently Frankie's grandmother's cookies are irresistable enough to turn her into a temporary Big Eater with a side of crazy.
- Bare Your Midriff: The t-shirt she's always wearing stops just short of her belly. It's more noticeable when her jacket isn't on.
- Beware the Nice Ones: 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.
- Butt Monkey: In a few episodes, especially "Imposter's Home", which is a half hour long Humiliation Conga of Dude, Not Funny! moments that culminate in her being the only one to miss a concert she'd been dreaming of for months.
- Cold Turkeys Are Everywhere: Don't let her know that Madame Foster made cookies.
- Cool Big Sis: 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)
- Dude Magnet: Mac, Bloo, Prince Charming, two geeks, a pizza delivery guy, and many more have fallen in love with her.
- Dude, Where's My Respect?: 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. 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.
- Fiery Redhead
- G-Rated Drug: Her grandmother's cookies. Let's just say it's best that she never catches wind of them.
- Green Eyes: Shown in "Destination Imagination" when she looks into the window of the dollhouse.
- I Can't Believe It's Not Heroin: Her cookie obsession.
- Masculine Girl, Feminine Boy: the Masculine Girl to Mac's Feminine Boy.
- Nice Girl: But then again, even she has limits.
- Not So Above It All: 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 faux nice guy who wants to turn Frankie into a slave by giving him a bloody nose and a wedgie, Moment of Awesome, 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 Disproportionate Retribution would be the understatement of the millennium.
- Most obvious when it comes to Madame Foster's cookies, which serve as a G-Rated Drug.
- Only Sane Employee: Between the neurotic Mr. Herriman and the absent-minded Madame Foster, it often falls to Frankie to be the voice of reason.
- Only Sane Woman: She plays the "Straight Man" role unless it's Mac's turn.
- Psychopathic Womanchild: Whenever Madame Foster makes her famous chocolate chip cookies, Frankie will regress into this.
- Reasonable Authority Figure: If the Friends have a problem, Frankie's their first choice to resolve it, and they'll avoid Mr. Herriman at all costs.
- Redhead In Green: Typically a green jacket. She rarely removes it.
- Servile Snarker: To Mr. Herriman.
- She Cleans Up Nicely: Frankie can do hot. Oh yeah.
- Significant Green-Eyed Redhead: Not shown due to the art style but her drivers license says she has green eyes.
- Single Woman Seeks Good Man: Proves this when she went on her date with 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.
- Big Good: As the owner of Foster's Home.
- Cool Old Lady: She's much nicer than Herriman, and she often plays along with Bloo's antics.
- Genki Girl: Even in her old age, she's got a lot of energy. Even Frankie can't keep up with her.
- The Ghost: For most of the pilot movie, to the point where Bloo assumed she was dead.
- Miniature Senior Citizens: She's even smaller than Mac.
- Morality Pet: To Mr. Herriman, in a sense.
- Nice Girl: She's generally a friendly and good natured person.
- Out-of-Character Moment: 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.
Goo Goo Ga Ga
- Attention Deficit... Ooh, Shiny!: She's even more easily distracted than Bloo is. It's also subtly implied that she might actually have Attention Deficit Disorder, but it's impossible to say for sure.
- Cloud Cuckoolander: She lives on a completely different plane of reality. It's partially because she was raised by Hippie Parents.
- Embarrassing First Name: Would you be okay with the fact that your name is "Goo?"
- Everything's Better with Rainbows: She seems to think so, what with her rainbow-colored outfits.
- Friendless Background: The reason she makes up all of those imaginary friends.
- Genki Girl: She's got way too much energy. She's almost at the level of Mac when he's had too much sugar.
- Ms. Imagination: Unlike Mac, she'll just create whatever imaginary friend comes to her mind.
- Motor Mouth: She constantly speaks a mile a minute.
- Nice Girl: Once you look past her wackiness, she's very nice.
- Nice Shoes: They're some kind of cross between clogs and cowboy boots.
- Open-Minded Parent: Both her parents are stated to be this (and possibly Hippie Parents 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.
- Out of Focus: She appears the most in Season 4.
- Reality Warper: 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.
- Recurring Character: In Season 4
- Savvy Guy, Energetic Girl: Energetic Girl to Mac's Savvy Guy.
- Ship Tease: 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, which Mac denies.
Voiced by: Tara StrongMac's evil 13-year old brother, and one of the antagonists of the series.
- Aloof Big Brother: He and Mac are not very close to say the least
- Asshole Victim: 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.
- Big Bad Duumvirate: With Duchess in the first episode.
- Big Brother Bully: He bullies Mac relentlessly. Their mom thinks it's because Mac is too kiddy, but he's probably just a jerk.
- Cain and Abel: The Cain to Mac's Abel.
- Closet Geek: He's a fan of The Loved and the Loveless.
- Cross Dressing Voice: Tara Strong reportedly hates doing his voice, because it strains her vocal cords to their limits.
- Demoted to Extra: After playing a really important role in the series premiere, Terrence became more of a minor character as the series went on. It's gotten to a point where he was eventually Out of Focus by the last two seasons that there are even viewers who forget Mac even has a brother.
- The Ditz: He's incredibly stupid. He can't even tell the difference between red and green.
- Dumb Muscle: 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.
- Evil Sounds Raspy: Terrence speaks in a very gruff voice.
- Expy: Of Sid Phillips.
- Hidden Depths: Who'd have guessed that Terrence of all people would be a fan of 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.
- Lean and Mean: Although he's pretty strong for his size.
- Leitmotif: He always has a metal theme play when he shows up.
- Muscles Are Meaningless: Despite the fact that he's thin and spindly, he's much stronger than an average 13-year-old.
- Out of Focus: In seasons five and six.
Voiced by: Grey DelisleMac'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.
- Adults Are Useless: 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.
- The Faceless: Her face is never shown.
Blooregard "Bloo" Q. Kazoo
Voiced by: Keith FergusonMac's reckless, hyperactive imaginary friend. Mac's complete opposite; however without him, Mac would do everything Bloo says and does.
- Acquainted With Emergency Services: 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.
- Attention Deficit... Ooh, Shiny!: Put a paddle ball in his sight, don't expect to hear from him for a while.
- Attention Whore: If everyone's attention is somewhere else, he'll do everything he can to bring it back to him.
- Characterization Marches On: The Pilot shows him to be much friendlier, with a few snarky qualities and seeming to have a generally good grasp on things.
- Comically Small Bribe: Bloo will frequently try and buy others off with pocket change.
- Deuteragonist: The main secondary focus, though he switches between this and being The Protagonist with Mac very often.
- Flanderization: He started out being very protective of Mac. Then he became a Jerk with a Heart of Gold 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.
- The Friend Nobody Likes: Mac (his creator) genuinely likes him; at best the others tolerate him due to Proximity and Supervision.
- Heroes Want Redheads: His (very shallow compared to Mac's) crush on Frankie.
- Hidden Heart of Gold:
- When he thought that Eduardo had died he was devastated, and said nobody else deserved to be him. When Eduardo came back to Foster's, he acted like he normally did, and said he didn't miss him at all. 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.
- It's All About Me: 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 Extreme Doormat-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
- Jerk with a Heart of Gold: In the earlier seasons, and occasionally in the later seasons.
- Jerk With A Heart Of Jerk: In later seasons. Even when he helps his friends, there's some shallow, selfish motive being his actions.
- Karma Houdini: 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 repeateldly letting Goo into Fosters the whole time instead of Mac, nor does he receive a commeupence.
- Manipulative Bastard: 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.
- Mars Needs Women: He temporarily develops a crush on Frankie in "Frankie my Dear".
- Oblivious to Love: Is completely oblivious to Berry's stalker crush on him. In fact, he can never remember her name or in some cases, her existence.
- Pet the Dog: 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.
- Precision F-Strike: 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 Throw It In moment.
- Red Oni, Blue Oni: The red to Mac's blue. Ironic, no?
- Screams Like a Little Girl: He already has a high-pitched voice as is, but when he screams, it becomes even squeakier.
- Send in the Clones: In "Bloo's Brothers".
- Sensitive Guy and Manly Man: The Manly Man to Mac's Sensitive Guy.
- Small Name, Big Ego: Somewhere along the line, he got the idea that he was the greatest imaginary friend ever. Needless to say, he really isn't.
- Smug Snake
- Took a Level in Jerkass: After the pilot episode. The show in general became incredibly cruel and mean-spirited after the whimsical pilot.
- Tsundere: A MAJOR type A. His nice side only comes out with Mac, and only if prompted.
- Unsympathetic Comedy Protagonist: Bloo's a selfish jerk to everyone.
- Villain Protagonist: At his worst. But even at his worst he's only ever an Anti-Villain.
- Vitriolic Best Buds: With Mac. Not in the pilot, but in the rest of the series.
- Vocal Evolution: Seems to be a byproduct of the Flanderization; as his voice got more nasally and whiny, his personality degenerated into Jerkass.
Voiced by: Phil LaMarrA one-armed imaginary friend desperate to be a nice person and gain acceptance.
- All of the Other Reindeer: 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.
- Apologises a Lot: Half of his dialogue starts with "I'm sorry, but..."
- Berserk Button: Wilt is not a fan of height jokes.
- Big Brother Mentor: He can be this to Mac and Bloo. He was also this to his creator.
- Break the Cutie: Dear lord, his backstory.
- Cannot Tell a Joke: Not even when reading them off of a cue card.
- Catchphrase: "Is that okay?"
- Chest Insignia: The number 1 on his torso.
- Cool Big Bro: The best guy to have as a basketball buddy, but unfortunately his caring nature 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).
- Extreme Doormat: 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.
- Fashionable Asymmetry: Wilt is missing his left arm, and his left eye is small and deadened compared to his right.
- Heroic Sacrifice: 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.
- Meaningful Name: Named after Wilt Chamberlain.
- My Greatest Failure: Good Wilt Hunting reveals his greatest shame. Losing a basketball game with his creator, who at the time took it hard. Wilt felt so ashamed he ran away.
- Named After Somebody Famous: Is named after famous and famously tall Wilt Chamberlain, which refers to his love for basketball and being a Gentle Giant.
- Nice Guy: Somewhat deconstructed; his niceness is constantly exploited.
- Reasonable Authority Figure: 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.
- Scars Are Forever: As a result of a Heroic Sacrifice he made when he and his creator were younger.
- What's My Line?: 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 Compressed Vice.
- Balloon Belly: She's actually really self-conscious about it.
- Bilingual Dialogue: She'll talk in her Pokémon Speak, the characters will respond with normal language.
- Cargo Ship: In-universe; she's shown affection towards a lamp and a mop.
- Dark and Troubled Past: While it's never stated in-universe, Word of God 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.
- Happily Adopted: Her real creator is unknown, but she was found and took in by two guys who appreciated her bizarre nature.
- Hidden Depths: 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.
- The Loonie: 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.
- Murder Is the Best Solution: 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.
- Out of Focus: Season 5
- Pokémon Speak: All she can say is "Co Co" Oddly enough, she can only write Coco as well.
- Reality Warper: Sometimes. The only reason this case is noteworthy is the fact that she's the only imaginary friend who seems to do this.
- The Unintelligible: Zig-Zagged. The audience can't understand her, but the main cast sometimes can and sometimes can't.
Voiced by: Tom KennyAn imaginary friend resembling a huge, hairy monster with a heart of gold.
- Adorkable: Super friendly, and incredibly kooky.
- Bilingual Bonus: Occasionally, he uses Spanish words in his dialogue, and has a Hispanic accent. Understandable considering that his owner is Hispanic.
- Berserk Button: 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.
- Beware the Nice Ones: 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.
- Cowardly Lion: 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 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.
- Cuddle Bug: Gives (nearly bone-crushing) hugs to people he's worried about.
- Does Not Know His Own Strength: And with his hugs come complaints of wanting to be let down.
- Face of a Thug: He looks like a savage beast when he's anything but.
- Gentle Giant: 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.
- Gratuitous Spanish: 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.
- Never Trust a Trailer: 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.
- Nice Guy: Is one of the most gentle friends in the entire house, despite his menacing appearance.
- Papa Wolf: Don't hurt his friends or he'll attack.
- Secretly Wealthy: It's revealed at the end of an episode that Eduardo has a safe full of riches he keeps in his toy chest. Turns out he's made a lot of smart investments.
- Super Strength: He is capable of carrying a bus around as if it wasn't even there. Though considering his size...
- Trademark Favorite Food: Potatoes, to the point that he curiously carries around a potato sack wherever he goes.
Mr. "Funny Bunny" Herriman
Voiced by: Tom KaneMadame Foster's imaginary friend; a Victorian, upper-class rabbit obsessed with maintaining order.
- Antiquated Linguistics: He talks like a 19th Century English gentleman.
- Berserk Button: Mr. Harriman does not like having his secrets revealed to the world as shown in World Wide Wabbit.
- Blind Without 'Em: His monocle. Without it, he can't see anything. Presumably, he's blind in the eye that doesn't have a glass on it.
- British Stuffiness: His accent serves to emphasize how tightly wound he is. He even provides the trope image.
- Cold Turkeys Are Everywhere: His addiction to carrots.
- The Finicky One: He's almost completely devoid of humor and is constantly stressed out about something.
- Graceful Loser: 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, 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.
- Hero Antagonist: His desire to enforce the rules and keep the order of Foster's Home puts him in conflict with Blue more often than not.
- High-Class Glass: His monocle.
- Jerk with a Heart of Gold: 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"
- Literal-Minded: 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".
- Mean Boss: Poor Frankie.
- Nice Hat: His top hat.
- Not So Above It All:
- 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."
- Obstructive Bureaucrat: Can sometimes come off this way.
- Rhymes on a Dime: His highly entertaining "Sweet Little Girl" routine.
- They Changed It, Now It Sucks: 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 Ruined FOREVER 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.
- Well-Intentioned Extremist: 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 Reasonable Authority Figure 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, even keeping a closet full of them.
- Why Did It Have to Be Snakes?: 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 he even called out "Frankie" instead of "Ms. Francis".
cheese-based imaginary friend with a childlike disposition; likes chocolate milk and cereal.
- Genius Ditz: He has a good memory.
- Punny Name: 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.
- Punctuated! For! Emphasis!:
- "I. Like. Cereal."
- "I! FOUND! A! CARROT!"
- Red Eyes, Take Warning: Subverted. He's mostly harmless. At worst, he's just annoying.
- Beware the Nice Ones: She seems nice and cute at first glance. However, once she becomes involved with Bloo, she goes full Yandere on him.
- Clingy Jealous Girl: She's so possessive towards Bloo that even his best friend, Mac, poses a threat to her "relationship".
- Hoist by His 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 thinking for once, she misses and ends up stuck on it herself and bouncing off into the distance.
- Love at First Sight: With Bloo.
- Murder the Hypotenuse : In Berry Scary, she merely tries to keep Mac out of her way. Played completely straight in Affairweather Friends.
- Stalker with a Crush: Ever since she arrived at Foster's, she has been following Bloo everywhere. Within the span of a few days.
- Stepford Smiler: A Type C variant.
- Straw Fan: She was made as a Take That to The Powerpuff Girls Shippers.
- Villainous Breakdown: 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 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.
- You Wouldn't Like Me When I'm Angry: Let's face it. She is a girl with a 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, get away from her, because she has lots of sharp teeth that she could bite you with! Also, when she screams, she screams for a long time, but only when she is strapped to the rolling rubber band ball.
Duchess Diamond Persnickety
- Aristocrats Are Evil: It's not clear if she's actually a "duchess" or if it's just a name. She's definitely evil, though.
- Art Initiates Life: Possibly, considering she looks like a Picasso painting.
- Big Bad Duumvirate: With Terrence in the first episode.
- Fluffy Tamer: Can exert near-perfect control over an Extremosaur in the first episode. She speaks to it affectionately with Baby Talk to boot.
- It's All About Me: 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.
- Rich Bitch: She acts the part, but she's an imaginary friend so she doesn't have any real money.
- Small Name, Big Ego: Her full, self-styled title is Her Royal Duchess Diamond Persnickety, the First, Last and Only. She clearly thinks way too much of herself.
- Smug Snake: She thinks that she's perfection. Nothing could be further from the truth.
- The Stool Pigeon: In the episode "Partying is Such a Sweet Soirée".
- 0% Approval Rating: Not one person in the series likes her at all...not even Madame Foster.
Voiced by: Phil LaMarrA small, green, furry imaginary friend with a deep voice, one eye, and a cool personality.
- Cyclops: His entire head is a single eye.
- Official Couple: With Fluffer Nutter. Maybe. This is hinted in three episodes, and they were also seen dancing together at the Macy's Thanksgiving Day Parade in 2007 and 2008.
Imaginary Man and Nemesister
Voiced by: Daran Norris and Grey DeLisleA superhero imaginary friend and his arch nemesis, a supervillainess imaginary friend. It turns out that they're actually siblings, created by siblings as a fun outlet for their sibling rivalry.
- Abnormal Ammo: Nemesis uses flowers rather than arrows against Imaginary Man.
- Achilles' Heel: Nemesis' hair and Imaginary Man's masculinity.
- Affably Evil: Nemesis.
- Arch-Enemy: To each other. Though it's implied that it's all just a game.
- Aww, Look! They Really Do Love Each Other: If anyone but each other attack them, they'll drop their act and become concerned for their safety.
- Cain and Abel: 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."
- The Corrupter: Nemesis was able to convince Bloo to temporarily become her Dragon Uniscorn.
- Femme Fatale: Nemesis.
- Flying Brick: Imaginary Man.
- Gasshole: One of Imaginary Man's powers is the "Atomic Belch".
- Hypocritical Heartwarming: Imaginary Man stopping Bloo from attacking Nemesis, because nobody pulls his Nemesister's hair but him!
- Impossible Hourglass Figure: Nemesis.
- Jerk with a Heart of Gold: Nemesister cares for her brother, and everything is just sibling rivalry.
- Kryptonite Factor: 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.
- Light is Not Good: 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.
- Man Child: Both of them, behaving like stereotypical children of each gender despite having adult bodies.
- Punny Name: Nemesister, a portmanteau of her usual title Nemesis, and Sister.
- Sibling Rivalry: Created through one, presumably to act as a more playful outlet to channel said rivalry.
- Superheroes Wear Capes: Imaginary Man.
- Wham Line:Imaginary Man: (after saving Nemesis from an angry Bloo) Nobody pulls my Nemesister'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.
- Big Bad: Of Destination Imagination
- Dimension Lord: He controls everything inside of his toy chest.
- I Just Want to Have Friends: His one motivation.
- The Faceless: Everything in his dimension lacks a face. He controls them by sliding into place as their face.
- Heel–Face Turn: Once he's promised genuine friendship, he drops all hostility.
- Madness Mantra: "No you don't no you don't now you DOOOON'T!"
- One-Winged Angel: A mishmash of various toys to become a giant monster.
- Villainous Breakdown: Mr. Herriman's chewing him out causes the kid to hyperventilate and enter One-Winged Angel mode.
- Crocodile Tears: Used these to manipulate Frankie and Mr. Herriman.
- Jerkass: Did nothing but cause havoc in the home and framed Bloo and his friends for it.
- Karma Houdini: 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.