[[foldercontrol]]
!! Titular duo
[[folder:Fanboy and Chum Chum]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/mainimage_fanboy_chumchum_112209-1_8306.jpg]]
[[caption-width:250:Fanboy on the left, Chum Chum on the right.]]
->'''Voiced by:''' Creator/DavidHornsby (Fanboy), Creator/NancyCartwright (Chum Chum, pilot), Creator/NikaFutterman (Chum Chum, series)

The eponymous, hyperactive duo, who live by the rule of no work and all play. They spend most of their free time hanging out in the local convenience store or having all kinds of wacky adventures in their house, which lacks any kind of adult resident. They are both comic book nerds (although much less so than Oz) and get ecstatic about the tiniest things.

They are the only characters to appear in all of the episodes.
----
!!! Tropes shared by both:
[[hardline]]
* BatmanParody: Their costumes are somewhat influenced by those worn by Batman and Robin. This is especially noticeable in the original ''WesternAnimation/RandomCartoons'' pilot, where [[EarlyInstallmentCharacterDesignDifference the green portions of Fanboy's costume were originally gray and Chum Chum's tunic originally had string ties like Robin's instead of a chest insignia resembling his face]].
* CheerfulChild: Both are hyperactive and joyful kids.
* ChildrenAreInnocent: These boys are very naïve and naturally unaffected.
* ChildishToothGap: Both have these.
* ClothingReflectsPersonality: Chum Chum wears yellow and orange, reflecting he's the nicest and most innocent, while Fanboy wears green and purple, showing he's also funny but can be more serious than Chum Chum.
* {{Cloudcuckoolander}}s: The ThemeTune makes it clear.
->''"A [[{{Understatement}} little]] coo-coo, Fanboy and Chum Chum."''
* ComicallyMissingThePoint: Many conflicts could have been avoided if they were more aware of their surroundings. One episode has them think that anything a baby plays with must be a baby toy, and then throw out everything in their house once one messes with everything they own.
* CoolMask: Fanboy has one, although he lacks any real powers. [[RealAfterAll Or, so you think...]]
* DependingOnTheWriter:
** It varies by episode which one of the two is smarter and more rational than the other. In some episodes, Chum Chum is more smart and level-headed than Fanboy, while in others, it's the other way around.
** Their attitude toward Boog also tends to vary by episode. In some episodes such as "Dollar Day" and "Chimp Chomp Chumps", they seem to dislike Boog and have no problem acting rude and antagonistic toward him, while in other episodes like "Fanboy in the Plastic Bubble", "Freeze Tag", and "Prank Master", they seem to actually care somewhat for Boog and act relatively friendly toward him, though they're still intimidated by his aggressive behavior and will still act rather antagonistic toward him if he harasses them first.
* DumbassHasAPoint: They sometimes tend to make rational explanations in spite of their idiocy, usually Chum Chum.
* EarlyInstallmentCharacterDesignDifference: The original pilot short on ''WesternAnimation/RandomCartoons'' had the green parts of Fanboy's costume colored gray and depicted Chum Chum with string ties on his chest similar to those on ComicBook/{{Robin}}'s tunic rather than an insignia bearing the silhouette of his face.
* ExpressiveMask: In this case, their masks are the same color as their eyelids.
* {{Expy}}: Most viewers associate them with [[WesternAnimation/SpongeBobSquarePants SpongeBob and Patrick]] due to their dimwitted nature and hyperactive personalities.
* FatAndSkinny: Chum Chum and Fanboy respectively.
* {{Fanboy}}s: So much that they wear costumes that make them look like super heroes for all their life. [[spoiler: They actually ''are'' superheroes as revealed in "Brain Freeze".]] Fanboy even names himself after this trope.
* {{Fartillery}}: Chum Chum's underwear "explodes" on Yo in "Prank Master".
* FeudEpisode: The episodes "Pick a Nose", "Cold War", "No Toy Story", "Lice Lice Baby" and "Heroes vs. Villains" show them against each other.
* {{Gasshole}}: Both of them are this, but it's more prominent with Fanboy.
* HeldBackInSchool: It is implied by Mr. Mufflin in the first episode that they were both held back at least one year in his class.
* HeterosexualLifePartners: To the point where they are intent on becoming "immortal companions" in "Fangboy". In "Separation Anxiety", their friendship is so strong that if they are apart, it causes a rip in the space-time continuum.
* {{Keet}}: Both are very hyperactive.
* LargeHam: Just about everything they say is spoken loudly and with a lot of cadence.
* LimitedWardrobe: The guiltiest of the cast. They ''never'' take off their superhero costumes, even for bathing. [[spoiler: This is because they have secret identities and taking them off would reveal them.]]
* MeaningfulName: "Fanboy", since he's a fan of everything and "Chum Chum" since "Chum" is a nickname for "friend", which he is with Fanboy.
* MoralityPet: Kyle's kinder sider is brought out when these two are with him.
* NeverBareheaded: They never take their masks off once.
* NiceGuy: Although annoying as two protagonists can get, both of them are friendly kids for the most part.
* NoIndoorVoice: From "Total Recall":
-->'''Oz''': [[PigLatin Ix-nay on the outside voice-ay!]]
-->'''Chum Chum''': Fanboy only has an outside voice. He was born that way.
* ObliviousToHatred: They're usually pretty much oblivious of Lenny and Kyle's hatred of them.
* OnlyKnownByTheirNickname: Both of them, though in "Separation Anxiety" Fanboy reveals his true name, Tobias.
** Though that's just speculation, because the name he signs the letter with is "Lance Corporal Tobias Cranapple Fanboy III" as a reference to dramatic western movies. Whether any of the names used are actually his real name isn't very likely.
* NonStandardCharacterDesign: Both are constructed more realistically and carefully than the rest of the characters. [[http://farm4.static.flickr.com/3474/3789426538_b445375f9a_z.jpg Especially prominent in this shot]].
* NoSenseOfPersonalSpace: Both of them, but Fanboy is more prone to this.
* ParentalAbandonment: Their parents are never seen nor mentioned.
* PingPongNaivete: Whichever one is the more intelligent of the duo varies per episode.
* PrecociousCrush: "Lice Lice Baby" has them both develop crushes on the school nurse Pam and fight each other over winning her affections. In the end, they stop after learning that Pam is Man-Arctica's girlfriend.
* RealityWarper: Both of them are all but stated to be this.
** Heavily alluded to in "Separation Anxiety", as separating them would rip a hole in the space-time continuum and nearly cause the whole universe to fall apart. It all goes back to normal once the two are reunited.
** When the two go camping on the Frosty Mart roof in "Fan vs. Wild", the roof somehow transforms into a snowy mountaintop like Mt. Everest, and they actually nearly freeze to death. The roof returns to normal whenever Kyle doesn't cope with it.
** In the climax of "Brain Freeze", they somehow gain actual superpowers to fight the Frosty Freezy Freeze monster; they stop working in the end, and when Lenny asks why they never use them, Fanboy claims the powers only activate if the situation is very serious and distressful.
* RedOniBlueOni: Both are the red to Kyle's blue. In episodes and scenes where it's just them, they tend to swap places with Fanboy being responsible (blue) ''and'' thinking up some sort of kooky plan (red) while Chum Chum is an excitable CheerfulChild (red) who tends to be the voice of reason when his friend flies off the handle (blue).
* SecretIdentity: Both are revealed to have these, but it's unknown what they are.
* SelectiveObliviousness: They actually choose to be unaware when they want, especially when Kyle first came to the school.
* SuperheroesWearCapes: Well, they ''think'' they're superheroes, but they still have capes.
* TrademarkFavoriteDrink: Frosty Freezy Freeze, of course.
* UnderwearOfPower: They wear actual underwear outside their suits. [[spoiler: They're upset without them, as they hold their powers.]]
* VagueAge: They look like they could be 9-11 years old.

!!! Tropes applying to just Fanboy:
* TheArtifact: The original pilot short on ''Random! Cartoons'' establishes that his codename comes from idolizing the superhero Fan Man. As Fan Man was DroppedAfterThePilot, this renders Fanboy's codename meaningless (though "Robo-mance" indicates at one point that Fanboy will call himself Fan Man in adulthood).
* BewareTheSillyOnes: Fanboy is a cheerful guy who is almost never serious. But he becomes no nonsense when it comes to protecting Chum Chum.
* BigBrotherInstinct: Fanboy is fiercely protective of Chum Chum, especially when Yo tries to kidnap him.
* CompressedHair: Due to wearing a cowl that covers almost his entire face.
* CraniumCompartment: His head can open like a jar at will whenever he wants. Becomes important in "Brain Drain" as it's used to lose his brain.
* FalseTeethTomfoolery: "The Tell-Tale Toy" depicts him as wearing dentures for a brief gag.
* GooGooGetup: "Battle of the Stands" has him pretend to be a baby to attract customers to his and Chum Chum's lemonade stand by wearing a bonnet and sucking on a pacifier. It fools everyone except Lupe and Yo.
* JerkWithAHeartOfGold: He can be rude, inconsiderate, and insensitive fairly often, but despite all this he still has some good nature in him and genuinely cares about Chum Chum and others (albeit to a lesser extent).
* PhlebotinumInducedStupidity: He literally loses his brain in "Brain Drain" and acts like an even bigger idiot than usual.
* ScreamsLikeALittleGirl: Fanboy in "Man-Arctica the Ride". The other kids all think it was a girl who was screaming the whole time.
* NoIndoorVoice: "Total Recall" even states he ''only'' has an outside voice.
* VerbalTic: Tends to pronounces the "Fr" in "Frosty Freezy Freeze" apart from each word:
-->'''Fanboy:''' He's got a Fr-osty Fr-eezy Freeze on his head! Get it!

!!! Tropes applying to just Chum Chum:
* ArtisticLicenseLinguistics:
--> "Stealers are bad people! I don't wanna be a bad people!"
* DistressedDude: In "Saving Private Chum Chum" when he swallows a ball and Mr. Mufflin mistakes him for a toy, locking him up.
* CaptainObvious:
** In "Fangboy", he easily recognizes Fanboy's "vampire" bite as just a bite from a mosquito, and in "The Incredible Shrinking Fanboy", he points out the sunflower grew overnight when Fanboy believes he's shrinking. Both times, he's dragged in to believe him.
** In "Hex Games" when Kyle tries to start the game by casting a spell and nothing happens, Chum Chum flatly replies, "Um...you put it in the Hex Box?" and shows the game console that powers it.
* CuteButCacophonic: He has a rather high pitched voice and his screams are so loud that they could send a grown man flying!
* {{Deuteragonist}}: His name come second in the title.
* DumbassHasAPoint: Sometimes is much more competent than Fanboy, and easily sees right through his naivety.
* GoodIsNotDumb: Usually he's smarter than Fanboy, depending on the plot.
* HulkMashUp: "The Incredible Chulk" revolves around him becoming a Hulk pastiche when Fanboy makes him laugh and his laughing fit causes him to transform into a big orange monster with immense strength and the ability to jump really high.
* NoNeckChump: His lack of a neck is a plot point in the episode "Fangboy", where Fanboy (who believed he had become a vampire due to waking up with a mosquito bite on his neck) tries to bite Chum Chum on the neck so he can also be a vampire. Upon discovering that Chum Chum doesn't have a neck, Fanboy decides to take him to a neck specialist named Dr. Acula so he can have one added surgically.
* ProstheticLimbReveal: He is revealed to have a prosthetic left leg in "Battle of the Stands".
* TookALevelInBadass: When he's just himself, he needs Fanboy to protect him from Yo. But as Super Chum he is strong enough to break out of any prison.
* TheVoiceless: Becomes this throughout most of "Saving Private Chum Chum" after swallowing a ball, with the only sounds coming out of his mouth being squeaking.
[[/folder]]

!!Supporting cast
[[folder:Kyle the Conjurer (aka, Kyle Bloodworth-Thomason)]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/kyle-fanboy-chum_7375.jpg]]

-> Voiced by: Creator/JamieKennedy

Kyle is a snarky, grumpy kid who, depending on the episode, takes the role of either the antagonist or a tritagonist for Fanboy and Chum Chum. He actually possesses wizardly powers, although no one believes him.
----
* AmbiguouslyGay:
** When he and Fanboy are trying to decide which board game to play, his first pick is "Mr. Unicorn's Teddy Bear Dress Up Fashion Show".
** In the "Fanboy and Chum Chum Bible", which is a compilation of ideas Eric Robles wrote down before the show started, Kyle was originally supposed to have a crush on Yo, and although he has never showed any interest in her in the actual series (nor have the two spoken to each other), this could make him [[AmbiguouslyGay Ambiguously Bi]].
** When he states that the town isn't big enough for two wizards in There Will Be Shrieks, he makes some feminine hand movements.
** In "Fanboy A'hoy!", we get this:
--->'''Kyle''': And will there be decorative soaps with fancy perfumes?! [Pause] Excuse ''me'' for taking pride in my personal hygiene.
* AesopAmnesia: Despite admitting his friendship to the titular duo in "Sigmund the Sorcerer", he forgets it episodes later.
* AlliterativeName: His designation of Kyle the Conjurer is at least phonetically alliterative.
* AnimeHair: Has a shaggy hairstyle that's quite big and spiky, due to his head shape.
* AntiHero: He serves as one due to being sometimes good and other times antagonistic.
* BabyMorphEpisode: He gets turned into a baby in "Crib Notes".
* BadassCape: Wears a black one, which symbolizes his mischievous personality.
* BlankWhiteEyes: Gets these while summoning the Balhok in "There Will Be Shrieks".
* BracesOfOrthodonticOverkill: Kyle has fairly normal braces, but they're extremely noticeable due to his large teeth. In "Night Morning", he wears an enormous headgear complete with its own train set.
* BreakoutCharacter: His popularity with fans may have lead him to get a bigger role in Season 2.
* BritishTeeth: He has huge braces to go along with his giant teeth.
* TheChewToy: His first episode revolves around him getting beat up for agitating others, which sets up his source of humor quite nicely.
* ClothingReflectsPersonality: Wears red and black, which are the colors of anger and darkness respectively.
* CloudCuckoolandersMinder: He serves as one to Fanboy and Chum Chum, often calling them out for their crazy shenanigans and what they are doing should not be the task at hand.
* ChickMagnet: In the episode "Face-Eating Aliens From Planet X" shows that he is liked by some of the girls; Marsha likes his braces, Lupe likes his accent, and Francine loves it when he makes the sky "dark and evilly".
* ChildMage: Albeit one with [[IneptMage very inconsistent magic skills]].
* DeadpanSnarker: He makes quite a lot of snide remarks, especially in regards to Fanboy and Chum Chum's idiocy.
* TheDogBitesBack: Kyle doesn't seem to have ever played a video game before, but he spends the entirety of "Hex Games" getting berated and injured throughout the video game Sigmund created (which he seems to have created [[{{Troll}} just to screw with Kyle, to boot]]), but Kyle keeps trying due to the chance for readmission in to Milkweed... which turns out to be all for nothing, as Sigmund calls him a [[YouFool fool]] and gloats in a DidYouActuallyBelieve speech, saying Kyle "never learns". But Kyle proves that he did at least learn how to play video games, and uses his new skill to [[HoistByHisOwnPetard beat the snot out of Sigmund.]]
* EveryoneHasStandards: Kyle does show hints of remorse for FB and CC at times, such as sticking up for them when calling out Mr. Trick when they initially failed on their quest, and at Icemas one time, he even joined in crying with everyone else when Fanboy rips off Mr. Mufflin's Man-Arctica costume, exposing him as a fraud.
* EvilCounterpart: He is one to Fanboy and Chum Chum. While they wear bright colored clothes, his clothing is darker. He is actually serious and refuses to be funny, and unlike them, he despises anything.
* EvilLaugh: He gets one in a few episodes.
* EvilSoundsDeep: Though not a villain, has a deep, masculine voice.
** There are quite a few episodes where his voice tends to sink into a low, demonic tone - quite frightening for viewers.
* {{Expy}}: His grouchy behavior, ButtMonkey status and constant suffering at a pair of idiots oblivious of the pain they cause him makes him one of [[WesternAnimation/SpongeBobSquarePants Squidward]], alongside Lenny.
* FieryRedhead: He can tend to be rather angry and has red hair to go along with it.
* GreenEyedMonster: He becomes this in "The Book Report of the Dead" and "Speed Eraser", both thanks to Fanboy.
* HypocriticalHeartwarming: Against the Candyman in "There Will Be Shrieks" when he hears the Candyman put a curse on Fanboy and Chum Chum, though he'd prefer to think it's more of a NotBigEnoughForTheTwoOfUs against another dark arts practitioner than anything to do with Fanboy and Chumchum.
--> '''Kyle''': So! You think you can come to ''my'' town and cast a spell on ''my'' two idiots!?
* IneptMage: One episode has him try to conjure up a bunch of notes, but he instead spends the night conjuring up things like newts, nets, and knights.
* InferioritySuperiorityComplex: There are hints of this in "Sigmund the Sorcerer", which reveals that there is a much more popular wizard from his same school that he wants to be on par with.
* {{Irony}}:
** The episode "Cold War" reveals he never actually had anyone ''want'' to play with him before; yet he himself does not want to play with Fanboy and Chum Chum because they add random rules to their games.
** In "Speed Eraser", after his revenge on Fanboy with the magic eraser doesn't go as planned, he literally attaches it to him and lists off what will be erased upon doing so. Yet seconds later, it's his own body that gets erased, when Fanboy tries to hold onto him.
* ItsAllAboutMe: He tends to be full of himself a lot. When he was the eraser-er, he even called himself "King of the Chalkboard".
* JerkassHasAPoint: Kyle makes valid explanations from time to time, especially in scenes where he had to cope with FB and CC's idiocy.
** In "Fangboy" when Fanboy was led to assume he was bitten by a vampire, Kyle was right to say he's not really a vampire because he's just delusional about it from a mosquito bite.
** In "Cold War", he screams against both boys for making up rules for their games, [[ObliviousToHatred not that they mind it, however.]]
** In "Fan vs. Wild", he chews them out for selecting the Frosty Mart roof for their camping trip and snubs Fanboy for smelling the stink from the air duct to the men's washroom.
* JerkWithAHeartOfGold: Kyle is very full of himself, but multiple episodes establish that he genuinely does view Fanboy and Chum Chum as friends and is willing to help them out.
* KindnessBall: Tends to slip into this part depending on the episode, usually in appearances when he does not speak. He actually ''approves'' of Fanboy's double arm talents in "Fanbidextrous", finds his deformed NightmareFace funny along with the rest of the class in "Funny Face", and in "A Very Brr-y Icemas" when Fanboy accidentally takes off Mr. Mufflin's Man-Arctica costume, Kyle is actually crying along with the rest of the visitors.
* LaserGuidedKarma: Jealous that Fanboy steals his title as board eraser-er, he gives him an eraser that ''literally'' erases everything. When he literally attaches it to Fanboy near the end, Kyle's own body gets erased as a result.
* {{Leitmotif}}: Usually whenever he appears, the background music consists of horns and harpsichords, reflecting his wizard-y self. When his bad side is shown though, it's replaced by a rather ominous EtherealChoir.
* MageInManhattan: Well, more like "Mage in the Suburbs" but since he's a transfer student who hails from a WizardingSchool, he counts.
* MagicMisfire: Quite a bit, especially when Fanboy and Chum Chum get a hold of his magic wand.
* MeaningfulName: The name "Kyle" means "narrow".
* MorphicResonance: When disguised as Chum Chum in Lord of the Rings, he keeps his braced teeth. [[VoicesAreNotMental Also, his voice doesn't change.]]
* NewTransferStudent: Well, technically, he was expelled from his WizardingSchool, but same thing.
* NotSoAboveItAll: While he usually plays the OnlySaneMan, he's been shown to be as quirky as the rest of the cast at times. One particular example is where the class takes advantage of Mr. Mufflin not being able to see them play with toys because of his laser eye surgery, and Kyle is among the kids playing with toys (or in his case, a bunch of magic equipment). He also laughs with the other children at the janitor's surname being Poopatine in "The Janitor Strikes Back".
* OddlyVisibleEyebrows: His brows can be over his bangs at times; other times they are under them.
* OnlySaneMan: When the plot demands it. Usually he's one of very few characters to have common sense. Other times, he's just as quirky as the rest of the characters, especially in background appearances.
* OutOfCharacterMoment:
** In "Man-Arctica the Ride", Kyle was one of the kids excited for the grand opening of the Ice Scream Extreme and even enjoyed riding it.
** In "Funny Face", he was one of the kids who laughed at Fanboy's altered face for the photo.
** In "A Very Brr-y Icemas", Kyle was among the crowd cheering for Fanboy as he told his wish; he even joined in crying with everyone after he accidentally ri
* PunchedAcrossTheRoom: By Lupe in "Wizboy" for accidentally sitting on her lunch.
* TheReasonYouSuckSpeech: Delivers two of them, one in "Chicken Pox" and another in "Cold War":
-->'''Kyle:''' Something's gone wrong! This is all your fault, you made me lay a bad egg! I got so mad, I probably hard-boiled it! And now, I'm going to be a chicken for the rest of my life!
-->'''Kyle:''' Grr...you're cheaters! Charlatans! With your...made-up rules and airborne livestock?!! ''I call '''shenanigans!!'''
* RedEyesTakeWarning: He briefly has these in "Tooth or Scare". Has them again in "Heroes vs. Villains" when making his entrance.
* RedOniBlueOni: The blue to Fanboy and Chum Chum's red.
* SeriesGoal: To return to the Milkweed Academy for Wizards, though this doesn't manifest until Season 2.
* SesquipedalianLoquaciousness: Tends to speak this way at times. To give an example...
-->'''Kyle:''' I intend to re-matriculate at my alma mater post-haste!\\
'''Chum Chum:''' Kyle's talking gibberish.
* SlasherSmile: He sometimes flashes these when he gets an idea or plans revenge.
* TheStoolPigeon: In "The Book Report of the Dead", Kyle becomes a Petty Peter when he tries to tell on Mr. Mufflin that Fanboy forgot to do his book report. Fanboy turns it on him by using Necronomicon to write it. He becomes one again when he catches Fanboy "back-sassing" Mr. Mufflin which results in the duo separated.
* SurroundedByIdiots: Considering Fanboy and Chum Chum hang around him a lot, it's to be expected.
* TeachersPet: In "The Book Report of the Dead", Mr. Mufflin even refers Kyle as "suck-up".
* TemporarilyAVillain: In "Separation Anxiety", "The Winners" and "Speed Eraser", Kyle is a main antagonist, the third episode being the most extreme example.
* TokenEvilTeammate: As far as Fanboy and Chum Chum's circle of friends go, Kyle is the most frequent one to be given an antagonist position, and a lot of his magic is definitely not of the good kind.
* TomeOfEldritchLore: He's casually used the Necronomicon to get out of jams.
* TookALevelInJerkass: In "Speed Eraser", an erasing dance routine by Fanboy causes Mr. Mufflin to give Kyle's job as the board eraser-er to him. Out of jealousy, he spends much of the episode planning revenge with an eraser that erases anything literally, but it only causes Fanboy to have more fun, so this leads him to literally attach the eraser to Fanboy, much to his horror and shock. He instantly loses his jealousy though, when Fanboy accidentally erases his entire body.
* {{Tsundere}}: Type A. He's always rejecting Fanboy and Chum Chum, but it has been hinted several times that he craves their friendship. Especially in the Sigmund the sorcerer episode.
* VagueAge: He says he's a preteen, so he can be anywhere around 9-13.
* VitriolicBestBuds: Fanboy and Chum Chum believe they are best friends with Kyle, even though he makes it clear that he wants nothing to do with them. Although, in a show where you wouldn't expect there to be any CharacterDevelopment, Kyle has actually started liking Fanboy and Chum Chum, and he even admits they're his friends in "Sigmund the Sorcerer."
* VocalDissonance: His voice is naturally lower than most other preteen boys in real life, sounding like he’s in his mid 20s.
* YouCantGoHomeAgain: He cannot return to his former school, Milkweed Academy, because he was expelled after turning his teacher into a raspberry flan. His goal is to be readmitted, [[StatusQuoIsGod but of]] [[FailureIsTheOnlyOption course it always fails.]]
* YouthfulFreckles: He is a red-headed preteen wizard with them.
* YoungerThanTheyLook: He's a preteen, which is around 10-12 years of age, but he looks like he's from his mid-teenage years. It comes through in his voice as well.
[[/folder]]

[[folder:Ozwald "The Oz" Harmounian]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/oz-fanboy-chum_4840.jpg]]
-> Voiced by: Creator/JoshDuhamel

A nerd who lives and runs a comic book shop with his mother. Considered by Fanboy and Chum Chum to be the smartest human being to have ever existed, due to his excessive knowledge of comics.
----
* ArtisticLicenseLinguistics:
-->'''Oz''': Don't make me choose between my babies! I CAN'T CHOOSE BETWEEN MY BABIES!!!
-->'''Fanboy''': Seriously?
-->'''Oz''': Seriously.
-->'''Chum Chum''': Seriously?
-->'''Oz''': I have never been more seriously.
* BasementDweller: To his mother's disappointment and frustration, he still lives with her and refuses to move out.
* BigEater: He's frequently seen eating or buying food, typically PlayedForLaughs.
* {{Catchphrase}}: "Seriously."
* BigNo!: Shouts one in "RattleSkunkuPine!" when the Creature left.
-->'''Oz''': NOOOOOOOOOO!!!!! (beat) Whew. That was a Long one.
* DisappearedDad: We never find out what his dad looks like.
* {{Fanboy}}: He's more stereotypical example than Fanboy and Chum Chum.
* MommasBoy
* MoralityPet: For both Fanboy and Chum Chum. Whenever they're around, he's always giving them good advice in their misadventures.
* ThePiratesWhoDontDoAnything: His business policy is actually ''never to sell anything''. To him, the shop exists only so that he has a place to put all his cool stuff. This is lampshaded mercilessly in "Hypnotized".
--> '''Fanboy''': Remember this? This was the first dollar you ever made! And you swore you'd never make another!
* PoorCommunicationKills: He believes his store is where he can store things, as if display them.
* SpeechImpediment: Has a noticeable lisp when he speaks.
* SpellMyNameWithAThe: Although, it's actually a rare occurrence for him to be called ''The'' Oz.
* TomboyishPonytail: His usual hairstyle, a rare instance for men.
* VerbalTic: He seriously has one, like [[{{Catchphrase}} seriously]].
[[/folder]]

[[folder:Boogregard "Boog" Shlizetti]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/boog-fanboy-chum_8807.jpg]]
->Voiced by: Creator/JeffBennett

A local bully who works in the Frosty Mart convenience store alongside Lenny (although using the word "work" is probably giving him too much credit). He appears to treasure his possessions far more than the people around him and enjoys picking on kids much younger than him.
----
* ArtisticLicenseLinguistics: [[LampshadeHanging Lampshaded]], as Fanboy and Chum Chum giggle at him right after he says this:
-->'''Boog''': Get out of this bubble and take your boppin' like a man! ...s.
* AssholeVictim: He gets his comeuppance for being a bullying {{Jerkass}} more often than not. Examples include the onslaught of humiliation and torment inflicted on him by Fanboy and Chum Chum in "Chimp Chomp Chumps" and his attempts to bop the aforementioned duo constantly backfiring in "Fanboy in the Plastic Bubble", as well as him being trapped in the bubble and floating away at the end of said episode.
%%* BadJobWorseUniform
* BeardOfEvil: {{Jerkass}} with a small beard on his chin.
* BerserkButton: Don't mess with his Chimp Chomp machine, or you ''will'' be bopped.
* BigBad: The closest thing the series has to one.
* BubbleBoy: In his childhood, he was forced to live in a plastic bubble due to having an air allergy. [[FreudianExcuse A flashback demonstrating this ends with him declaring that he will one day make everyone as miserable as he once was.]]
* TheBully: To just about everyone, although his primary target is [[WouldHurtAChild younger children]]. He even considers "delivering knuckle-sandwiches" a hobby.
* ButtMonkey: He tends to suffer quite a lot of humiliation, pain, and misfortune, typically as LaserGuidedKarma for his {{Jerkass}} behavior. A few good examples of this would be "Chimp Chomp Chumps", "Fanboy in the Plastic Bubble", "Bubble Trouble" and "Freezy Freaks".
* TheChewToy: Any unfortunate or humiliating thing that happens to him happens not only because he [[AssholeVictim deserves it]], but also for the amusement of the viewers.
* CoolCar / ThePreciousPreciousCar: The proud owner of Sandy.
* CompanionCube: He talks to the Chimp Chomp machine as if it's his girlfriend. He's the same way with his car named Sandy.
* EvenEvilHasLovedOnes: "Evil" might be stretching it, he's more just a big {{Jerkass}}, but no matter how rude he is to everyone, he cares deeply for his Chimp Chomp arcade system, treating it like a person and lover. He also shares a similar love for his car Sandy.
* EvilLaugh: He has a rather crazy one.
* {{Expy}}: His greedy and hotheaded behavior brings to mind [[WesternAnimation/SpongeBobSquarePants Mr. Krabs]], while his antagonist role and bullying of children could be compared to [[WesternAnimation/TheFairlyOddParents Vicky]] [[ProductionPosse (which isn't surprising, considering that both shows are made by the same production company)]].
* FreudianExcuse: He had a miserable childhood living in a plastic bubble due to air allergies and vowed to make everyone feel his pain one day. That is to say, in the present day.
* HighPressureEmotion: He has shown this at least three times. In one instance, he gets so angry that the lid to his cup hat blows off.
* {{Jerkass}}: He's a very rude, hostile, mean, and aggressive individual who regularly bullies and physically attacks others for his own amusement.
* KnifeOutline: He has it done to him in "Monster in the Mist", although he doesn't scream until there's a fork approaching his crotch.
* NoCelebritiesWereHarmed: Boog's voice is basically John Travolta's ''Series/WelcomeBackKotter'' character, Vinnie Barbarino.
* ScreamsLikeALittleGirl: In "Monster in the Mist".
* SensitiveGuyAndManlyMan: Manly Man to Lenny's Sensitive Guy.
* TheSlacker: He never actually does his job, preferring to arrive 7 hours late and play Chimp Chomp all day.
* ShockAndAwe: One episode ends with his getting the power to shoot lightning out of his hands as a side effect of a shock collar.
* ShoutOut: He's an obvious John Travolta parody with a sweet ride named Sandy as an homage to ''Film/{{Grease}}''.
* RedOniBlueOni: The red to Lenny's blue.
* UnusualEuphemism: In "The Frosty Bus", Boog says to the titular duo, "I am gonna bop the boppin' bop out of you two!" In "A Bopwork Orange", after Agent Johnson says he is fired, Boog replies with, "What the... bop?!"
* VanityLicensePlate: Boog's license plate reads "BORN 2 BOP".
* WouldHitAGirl: He has no problem bopping Yo along with the other kids.
* WouldHurtAChild: He also has no problem bopping kids in general, when he himself is an adult.
* YoungerThanTheyLook: He's supposed to be in his teens, but he looks like he's in his early twenties.
** But in Back From The Future, they went back five years to when Boog was first employed, so he has to actually be in his twenties.
[[/folder]]

[[folder:Leonard "Lenny" Flynn Boyle]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/lenny-fanboy-chum_8931.jpg]]
-> Voiced by: Creator/JeffBennett (pilot), Creator/WyattCenac (series)

Like Boog, he works in the local Frosty Mart. Lenny appears to be permanently stressed out/spiritless and absolutely loathes Fanboy and Chum Chum's hijinks. Basically a standard ButtMonkey of the show.
----
%%* BadJobWorseUniform
* BeleagueredAssistant: He's ''always'' the one to clean up after the other characters' messes, despite being the assistant manager of the Frosty Mart.
* TheChewToy: Fanboy and Chum Chum (almost always unintentionally) cause him a lot of misfortune.
* CompanionCube: He's infatuated to his bike named Bikey and is devastated when it's destroyed in "The Great Bicycle Mystery".
* DeadpanSnarker: His response to a lot of the craziness of the show is snark.
* EarlyInstallmentCharacterDesignDifference: While an African-American, he was depicted as a blond Caucasian in the original ''Random! Cartoons'' pilot.
* {{Expy}}: His grouchy behavior, ButtMonkey status and constant suffering at a pair of idiots oblivious of the pain they cause him makes him one of [[WesternAnimation/SpongeBobSquarePants Squidward]], alongside Kyle.
* IronicName: His name means "Brave as a Lion"; he's easily annoyed, meek and always freaking out.
* JerkWithAHeartOfJerk: Lenny spends one episode travelling back in time to try to make Fanboy and Chum Chum never discover Frosty Freezy Freeze (and thus, never get into the habit of visiting him), and his final attempt has him seemingly give up as he shows them the machine with a smile and lets them try some of the drink... before smashing it to pieces right in front of them and showing no concern over the two boys crying at how they will never be able to drink it again.
* NeatFreak: Hard to blame him for wanting normality amongst the show's general craziness.
* NerdGlasses: He acts like a stereotypical nerd and has glasses to go along with it.
* OnlySaneMan: He's about the most normal person in the show.
* ScreamsLikeALittleGirl: Best shown in one episode where his bike is destroyed and he responds with a high-pitched scream.
* SensitiveGuyAndManlyMan: Sensitive Guy to Boog's Manly Man.
* SurroundedByIdiots: Similar to Kyle, he has little patience with Fanboy and Chum Chum's moronic antics, though he's more annoyed than malicious.
* TokenMinority: The only black character except for Fanboy and Chum Chum's classmate Michael Johnson.
* TwitchyEye: He gets a "stress twitch" when particularly annoyed by Fanboy and Chum Chum. He even owns an anti-stress twitch cream.
%%* YoungerThanTheyLook
[[/folder]]

[[folder:Hank Mufflin]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/Mr__Mufflin_916.JPG]]
-> Voiced by: Creator/JeffBennett

Fanboy and Chum Chum's class' ApatheticTeacher. Speaks with a ridiculously monotone, dull voice and is exceedingly hateful of his job. Sometimes refers to Fanboy as "Purple Kid" and to Chum Chum as "Talking Raccoon".
----
* ApatheticTeacher: He's said more than once that it's only twelve years until his retirement. In the first episode, he states outright that if Fanboy and Chum Chum get held back again, he's considering early retirement.
* CharacterDevelopment: He somehow drops his apathetic persona in later episodes.
* DrivesLikeCrazy: One episode reveals he always drives illegally and out of control to get to and from school.
* {{Expy}}: Is essentially a human male version of [[WesternAnimation/SpongeBobSquarePants Mrs. Puff]].
* EyeBeams: Mr. Mufflin gets laser eye surgery in "Saving Private Chum Chum", allowing him to literally shoot lasers out of his eyes.
* LiteralMinded: When he says he got laser eye surgery in "Saving Private Chum Chum", he really got ''laser eyes''.
* MallSanta: He appears at the Frosty Mart as a Mall Man-Arctica in "A Very Brrr-y Icemas".
* NeverMyFault: It seems to be born out of stupidity rather than malice, but "Precious Pig" has him entrust Fanboy with his [[HousepetPig pet pig]] Precious and later punish him with shunning once everyone believes that Fanboy was trying to hurt Precious. Upon finding Fanboy about to hit Precious as part of karate training, Mr. Mufflin asks who gave Fanboy Precious, and once it turns out that Fanboy really did teach Precious karate, he calls out his students for shunning him and gives them all detention.
* NoNeckChump: He once celebrates that his lottery ticket lets him afford a neck implant surgery so he won't have to paint on scarfs anymore.
* WouldHurtAChild: In "I, Fanbot", he gets so angry at Fanboy for costing him a new bouncy house that he tells the students not to attack him so that ''he'' can get the first shot.
* ZombifyTheLiving: He becomes a zombie without being dead first in "The Book Report of the Dead" when he reads Fanboy's book report, which Fanboy wrote by copying passages from Kyle's Necronomicon.
[[/folder]]

[[folder:Yo]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/yo_backs_s2e17.jpg]]

-> Voiced by: Creator/DyanaLiu

An [[GenkiGirl incredibly energetic girl]] who loves her digital pet [[BlandNameProduct Yamaguchi]]. She is one of Fanboy and Chum Chum's schoolmates. Being vulnerable to all things cute and tiny, she becomes extremely obsessive whenever Chum Chum is involved, often to the point of insanity.
----
* AdvertisedExtra: Is billed are one of the main characters, but barely has any speaking roles in the episodes. This is more apparent when she was DemotedToExtra in the 2nd season. Lupe has more speaking appearances than her, and she is billed as a recurring character.
* AndCallHimGeorge: Yo is ''obsessed'' with taking Chum Chum home, dressing him up in a sailor outfit, and putting him on her toy shelf.
* ArtificialLimbs: She has a couple of [[ComicBook/DoctorOctopus Doc Ock]]-like robotic arms in her backpack.
* CharacterDevelopment: Her crush on Chum Chum is abandoned at the start of the second season.
* CompanionCube: Her best friend is a pine cone named Ingrid, and she treats her digital pet, Scampers, like it's a real cat.
* CuteBruiser: In "Prank Master", she proves to be as formidable as she is cute.
* CutenessProximity: She tries uses her girlish charm to her advantage.
-->"In case you haven't noticed, I'm ''cute''!"
* DemotedToExtra: Has way less speaking roles in the second season and has less focus as well.
* {{Fangirl}}: With her maniacal obsession with digital pets, cute things, and Chum Chum.
* FriendVersusLover: In a way, she sees Fanboy as the greatest hurdle between her and Chum Chum.
* GenkiGirl: So genki, she can appear in two places at once.
* GirlsLoveStuffedAnimals: Several are seen in her room, along with [[CollectorOfTheStrange a few small children]].
* GirlishPigtails: Her usual hairstyle.
* GracefulLoser: In "Prank Master", she initially seems upset at being finally bested by the boys, but soon gets over it and congratulates them on their victory. Boug angrily says that "she takes the fun out of gloating".
* [[ImTakingHerHomeWithMe I'm Taking Chum Chum Home With Me!]]: She does this in one episode. Inverted in another where she wants to ''live'' with him.
* InvisibleParents: She mentions her father in "Brain Drain" but he has yet to make an appearance on the show.
* MeaningfulName: Her name means "Positive". Coincidentally, it's Japanese, like she is.
* NiceGirl: Really perky and positive when not focusing on Chum Chum and is normally kind towards Fanboy when they're not arguing.
* PrematurelyBald: "Battle of the Stands" has Fanboy reveal that she lost her real hair at some point and now wears a wig.
* RedOni: She's the red to Lupe's blue.
* RealityWarper: She's prone to altering the world around her to get closer to Chum Chum.
* SatelliteCharacter: Subverted. Although she has a crush on Chum Chum, it's one of her character traits and not her entire character unlike other media examples.
* StalkerShrine: She has one for Chum Chum with candles and a burning cauldron, as shown in "The Incredible Shrinking Fanboy".
* StalkerWithACrush: [[LoveMakesYouCrazy Big time.]] In "Trading Day", she even trapped Chum Chum in a giant virtual pet case.
* StalkingIsFunnyIfItIsFemaleAfterMale: Her obsessive pursuing of Chum Chum would be way more uncomfortable if she was male and Chum Chum was female.
* TeleportersAndTransporters: She has a cellphone in "Brain Drain" that allows her to teleport anywhere.
* {{Tsundere}}: There are signs of her being a type B. She becomes unpleasant sometimes, particularly when dealing with Fanboy.
* {{Yandere}}: Although her craziness varies DependingOnTheWriter. In some episodes she can't keep her hands off Chum Chum, and other times, she acts like she doesn't notice him.
[[/folder]]

[[folder:Lupe]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/lupe_3639.jpg]]
-> Voiced by: Creator/CandiMilo

Fanboy and Chum Chum's schoolmate. Appears to be friends with Yo.
----
* AbhorrentAdmirer: She falls for Fanboy in "Fanboyfriend", with Fanboy not being happy about the affection, but at the end of the episode, [[UnrequitedLoveSwitcheroo the feelings are flipped.]]
* BerserkButton: Apparently messing with her lunch. In "Wizboy" when Kyle accidentally sits on her lunch, she punches him hard enough to send him sliding all the way across the table, which leaves him with a black eye and hair full of food.
* BrawnHilda: She has a clear Spanish accent and a large build.
* CutenessProximity: Along with Yo, Lupe uses her girlish charm to attract customers at her lemonade stand in "Battle of the Stands".
* GentleGiant: She looks a bit intimidating, but is genuinely a nice person more often than not.
* GratuitousSpanish: She sometimes uses Spanish words in her sentences.
* MobileSuitHuman: "Battle of the Stands" has her secret turn out to be that she's much smaller than she appears and the body we see is a robot she controls from within.
* WhyDidItHaveToBeSnakes: She is scared of spiders, as revealed in "Fanboyfriend".
[[/folder]]

[[folder:Chris Chuggy]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/chris_chuggy.png]]

A classmate of Fanboy and Chum Chum's who only communicates with the only phoneme he can utter: "Wah."
----
* TheDitz: Everyone has their moments of ditziness, but he stands out as having the smallest brain out of everyone.
* TheUnintelligible: Never utters a coherent sentence or word.
[[/folder]]

[[folder:Michael Johnson]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/8e84e611_0198_4300_b457_4c186916264e.jpg]]
-> Voiced by: Wyatt Cenac

A classmate of Fanboy and Chum Chum's.
----
* AdvertisedExtra: Even though he's a recurring/minor character, he is shown in the intro along with more prominent characters like Chris Chuggy and Lupe.
* NoCelebritiesWereHarmed: He's an obvious send-up of Music/MichaelJackson, complete with wearing a jacket similar to the costume from the ''Thriller'' music video, moonwalking and occasionally saying "hee-hee" and "Shamone".
* TokenMinority: He and Lenny are the only African-American characters in the show.
[[/folder]]

[[folder:[=FanKyleChum=]]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/fankylechum_after_the_goggles_get_taken_away.jpg]]
-> Voiced by: Jamie Kennedy

Yet another classmate of Fanboy and Chum Chum's.
----
* NegativeContinuity: He is permanently excused from school in his first appearance, but continues to appear in Fanboy and Chum Chum's class in subsequent episodes.
* RuleOfFunny: He debuts in the episode "Excuse Me", where Mr. Mufflin permanently excuses him from school as a result of reading a torn-apart excuse note that Fanboy, Chum Chum and Kyle tried to tape back together. The bizarre and unlikely circumstance of the boys having a classmate whose name is an amalgam of theirs as well as a student being allowed to not attend school forever are acceptable mainly because of how silly the prospects are.
* TokenMinority: The only Indian character in the show.
[[/folder]]

[[folder:Francine]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/francine_glares_at_fanboyjpg.jpg]]
-> Voiced by: Creator/CandiMilo (rest of series)

Yet another clasmate of Fanboy and Chum Chum's.
----
* AlphaBitch
* DependingOnTheWriter: Most of the time she appears to dislike the eponymous duo, but sometimes she'll appear as a background character joining them in some activity for no discernible reason.
* ForeheadOfDoom
* OutOfFocus: She's only had a couple of speaking appearances.
* PopularIsDumb: Averted. She's actually one of the smartest kids, but that's not much of an accomplishment.
* ValleyGirl: In a subversion, she's not as dumb as her voice makes her sound.
[[/folder]]

[[folder:Cher "Cheer" Leader]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/cher__whoo_hoo__s1e11a.jpg]]
-> Voiced by: Creator/CandiMilo

A clasmate of Fanboy and Chum Chum's.

* GenkiGirl: Being a cheerleader and all.
* PunnyName: Her name is a play on words for "cheerleader".
[[/folder]]

[[folder:Duke]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/duke_27.jpg]]
-> Voiced by: Creator/JeffBennett

A clasmate of Fanboy and Chum Chum's.

* LovableJock
* ThoseTwoGuys: With Michael Johnson or Chris Chuggy at times.
[[/folder]]

[[folder:Nancy Pancy]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/nancy_hosting_bake_salejpg.jpg]]
-> Voiced by: Creator/KariWahlgren

A clasmate of Fanboy and Chum Chum's.

* NiceGirl: Sweet and caring.
[[/folder]]

[[folder:Cheech]]
[[quoteright:174:https://static.tvtropes.org/pmwiki/pub/images/7968b5f9e672676a4bab75802faf1146.jpg]]

A clasmate of Fanboy and Chum Chum's.

* OutOfFocus: Is a background character who doesn't even talk 99% of the time.
[[/folder]]

[[folder:Janitor Russ Poopatine]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/poopatine_4509.jpg]]
-> Voiced by: Steve Tompkins

The janitor at Fanboy and Chum Chum's school.
----
* AlmightyJanitor: Despite being well, [[ExactlyWhatItSaysOnTheTin a janitor]], he seems to have a lot of power among the school staff with access to complex equipment including a robotic chair that can be equipped with a vat of acid.
* BerserkButton: He despises gum to the extent that he wants to destroy every piece of it he finds.
* CompanionCube: He seems to have a personal relationship with his mechanized chair, Brenda.
* {{Expy}}: His surname, raspy voice, decrepit appearance and the fact that he wears a dark hood make him a very obvious pastiche of Emperor Palpatine from ''Franchise/StarWars''. Heck, a fair amount of his dialogue is ''Star Wars'' references.
* TrashOfTheTitans: He has a trash collection in "The Janitor's Apprentice".
* UnfortunateNames: ''Poop''atine. Everyone laughs at his name when it is first said (with a RunningGag having someone always say "[[PhraseCatcher poop]]" after his name is mentioned), and he insists on being called "Russ".
[[/folder]]

[[folder:Oz's Mom]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/ozsmom_2941.png]]
-> Voiced by: Estelle Harris

She's Oz's mom. Runs a comic book shop alongside Oz.
[[hardline]]
* MiniatureSeniorCitizens: She's only slightly larger than Chum Chum, who is already quite small in comparison to the other characters.
* UnnamedParent: So far, she's just known as "Oz's mom".
[[/folder]]

[[folder:Scrivener Elf]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/scrivelf_3303.jpg]]
-> Voiced by: Creator/JeffBennett

An elf created by Kyle who is often seen making notes for him.
----
* DeadpanSnarker: Even his master Kyle isn't immune to mockery through snark.
* TheFairFolk: Though more of a {{Jerkass}} than evil.
[[/folder]]

[[folder:The Dollarnator]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/dollarnator_4569.jpg]]
->Voiced by: Creator/JeffBennett

An artificially intelligent machine Fanboy has built in the future, the Dollarnator was sent back to the past to help the boys when they were in trouble. [[DoAnythingRobot He has a lot of different skills and abilities that often prove to be unexpectedly helpful for the titular duo.]]
----
* TheAhnold: Like most Terminator parodies, his voice is an imitation of Arnold Scharzenegger.
* ChekhovsGunman: His very first appearance has him hinted at the start of the episode when Fanboy discusses building a robot, with said robot being Dollarnator arriving from the future.
* DoAnythingRobot: Time travel, make confetti, record music, you name it.
* RobotBuddy: He's a robotic companion of the main duo built by Fanboy in the future.
* TerminatorImpersonator: He is quite literally the T-800 in Film/Terminator2JudgmentDay, except as an arcade machine, and he's helping out two kids instead of one.
* TimeMachine: He ''is'' one, allowing him to arrive from the future to help Fanboy's younger self. Lenny exploits this in "Back from the Future" to try and go back to when Fanboy and Chum Chum first came to the Frosty Mart and prevent them from tasting Frosty Freezy Freeze for the first time so he wouldn't suffer their antics in the present day.
[[/folder]]

[[folder:Sigmund the Sorcerer]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/sigmund_2659.jpg]]
-> Voiced by: Creator/JeffBennett

He and Kyle used to attend the same school for wizards, which is how they became rivals. Sigmund is clearly more acknowledged and advanced in wizardry than Kyle, much to Kyle's anguish.
----
* AlliterativeName: '''S'''igmund the '''S'''orcerer
* AlwaysSomeoneBetter: A more experienced and celebrated mage compared to Kyle.
* BadassLongcoat: He has a leather jacket that goes down to his knees.
* BaddieFlattery: He did compliment Kyle at least once.
* ChildMage: A much more competent one than Kyle.
* FauxAffablyEvil: He's not exactly evil, but a {{Jerkass}} and seemed to be very glad to mock and humiliate Kyle, all the while remaining well-spoken and charming.
* {{Expy}}: He's a spoof of [[Franchise/HarryPotter Harry Potter's]] rival Draco, although his original name was Henry Kotter.
* HellBentForLeather: Leather jacket.
* {{Jerkass}}: His interaction with Kyle certainly doesn't paint him as a nice guy.
* RichBitch: When he gets Fanboy and Chum Chum as servants, he decides to kill them because he can easily buy new helpers.
* SmugSnake: He gladly mocks Kyle for being the better wizard.
* TheRival: To Kyle, who attended the same wizard school as him.
* {{Troll}}: He seems to have made the video game "Sigmund the Sorcerer's Wizard Challenge" just to screw with Kyle, since the box says "complete the game and win admission to Milkweed Academy," which is something he knows Kyle desperately wants, the entire game is based around bashing Kyle ("194 Kyle-bashing levels later...") and it's revealed at the end that the "Milkweed Academy" Kyle wins is just a board game, rendering the whole thing pointless, and that the virtual-Sigmund is actually the real Sigmund, who [[DidYouActuallyBelieve taunts Kyle for believing that winning the game would actually get him back into Milkweed.]] This backfires on him when [[HoistByHisOwnPetard Kyle uses his new video game prowess to beat up the real Sigmund.]]
[[/folder]]

[[folder:Man-Arctica]]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/manarctica_7572.jpg]]
-> Voiced by: Creator/JeffBennett

A superhero and the titular duo's idol. He also delivers presents to nice children.
[[hardline]]
* BadassSanta: He serves the role of Santa in the show, and also fights evil.
* CatchPhrase: "Time to break Arctic wind!"
* CoolMask: He has a mask that covers everything but his mouth.
* {{Expy}}: A combo with powers like Ice-Man and looks like Batman.
* HeroicBuild: He's very muscular and a superhero.
* AnIcePerson: As his name might tell you, his powers are ice-based.
* JerkWithAHeartOfGold: He apparently delivers presents to children because the sound of their crying greatly annoys him, and he's shown to not be above taking revenge, but he is ultimately a good and heroic person.
* LanternJawOfJustice: He's a superhero with a large chin.
* PickyEater: He loves milk and cookies, but considers the order in which they are placed in important or he will classily them as "cookies and milk" and not show up.
* SuperheroesWearCapes: He has a blue cape to go along with his superhero status.
* SuspiciouslySimilarSubstitute: He more or less takes the place of Fan Man from the original ''Random! Cartoons'' pilot as Fanboy and Chum Chum's idol. Both characters are even superheroes voiced by Creator/JeffBennett.
* TopHeavyGuy: He has a muscular upper body, but tiny legs.
* TrademarkFavoriteFood: Since he's pretty much Santa, he loves milk and cookies (but not cookies and milk).
* WouldHurtAChild: In an episode where the cast invite him to play freeze tag, Man-Arctica [[LiteralMinded interprets the game as having to freeze the others]] and traps [=FanKyleChum=] in a block of ice. While this was mostly out of a great misunderstanding of how the game works and of no ill intent, after Yo and Lupe give him a wool sweater that agitates his allergies, Man-Arctica feels betrayed and tries to freeze the rest of the children out of anger.
[[/folder]]

[[folder:Thorvald the Red]]
-> Voiced by: Creator/NolanNorth

A Viking who was frozen in ice a long time ago and thaws out in the present day. He thinks that Fanboy and Chum Chum are his old friends Flathead and Half-Legs.
[[hardline]]
* BoisterousBruiser: One of the [[LargeHam Largest Hams]] in the show, and quite strong at that.
* DumbMuscle: It might be due to being displaced from his time period, but he tried to fight a dragon by playing an arcade machine. It still got him to Valhalla, though.
* FieryRedhead: Of the LargeHam kind to go along with his red beard.
* HornyVikings: Viking with a horned helmet.
* HumanPopsicle: He tripped over a pile of his vanquished enemies and froze in a lake. He somehow ends up in Fanboy and Chum Chum's fridge as a popsicle and thaws out when they leave his block of ice out in the sun.
* LargeHam: He speaks ''very'' loudly.
* TopHeavyGuy: Huge upper body, tiny, tiny legs.
* WhyDidItHaveToBeSnakes: His second appearances happens because he got scared of a spider and dropped his axe from Valhalla when he tried to shoo it away.
[[/folder]]

[[folder:Agent Johnson]]
->Voiced by: Creator/JeffBennett

A government agent who occasionally crosses paths with Fanboy and Chum Chum.
----
* HeroAntagonist: He has played the role of antagonist, but is usually just doing his job. An episode where he is in charge of taking back a recalled toy has him pursue the titular duo and Oz, but it turns out that he was going to give them another toy as compensation, and had no ill intent regardless since the recalled toy was already established as dangerous.
* NonstandardCharacterDesign: He's a lot less cartoony in comparison to the other characters.
[[/folder]]

[[folder:Yum Yum]]
-> Voiced by: Creator/JohnDiMaggio

A sentient blob of chewing gum owned by Fanboy and Chum Chum who came to life.
----
* AdvertisedExtra: He is prominently featured in the show's opening sequence in spite of only making sporadic cameos after his debut episode.
* BlobMonster: He's a walking pile of gum.
* {{Cyclops}}: He has only one eye.
* HulkSpeak: Articulate he isn't.
-->'''Yum Yum:''' Yum Yum drink all the cow juice.
[[/folder]]

[[folder:Berry the Ice Monster]]
-> Voiced by: Creator/KevinMichaelRichardson

An ice monster associated with Frosty Freezy Freeze.
----
* EarlyInstallmentCharacterDesignDifference: The pilot depicted him as a hulking brute with no clothes, while his in-series appearance makes him significantly smaller and wimpier in addition to wearing a Frosty Freezy Freeze T-shirt.
* EarlyInstallmentWeirdness: The ''Random! Cartoons'' pilot depicts him as a villain created from Frosty Freezy Freeze coming into contact with Ice Monster Bun Buns, while the episode "Berry Sick" establishes that he lives inside the Frosty Freezy Freeze machine and uses his powers to create the icy beverage in addition to making him friendlier.
* MeaninglessVillainVictory: The pilot has Fanboy and Chum Chum challenge him to a round of thumb wrestling to determine who would consume the last of the duo's Frosty Freezy Freeze, with Berry intending to consume the Frosty Freezy Freeze in order to finish developing his legs. While Berry wins, his victory is undermined by the revelation that Chum Chum had already finished drinking it all.
* PunnyName: His name is a homonym of the name "Barry" and a play on the fact that he's an ice monster who uses his powers to create a fruit-flavored slushy.
* SolidGoldPoop: "Berry Sick" has Fanboy and Chum Chum consume his sweat and waste products due to them having the same properties as Frosty Freezy Freeze.
[[/folder]]

[[folder:Professor Flan]]
-> Voiced by: Creator/{{Jim Cummings|1952}}

A teacher at Kyle's old school Milkweed Academy, who is in fact the very teacher Kyle turned into raspberry flan and as consequence was expelled from Milkweed.
----
* AnthropomorphicFood: He's walking, talking raspberry flan.
* ForcedTransformation: He was turned into flan by Kyle.
* HighClassGlass: He wears a monocle to show his high social status.
* OverlyLongName: His full name is Professor Jonathan James Jasper Jackson Jamarcus Jaminiquide "J.J." Flan, Jr.
* UnseenNoMore: He is indirectly mentioned in Kyle's debut episode "Wizboy" before making his first physical appearance in "Crib Notes".
[[/folder]]

[[folder:Retchy Lintpockets]]
-> Voiced by: Creator/EricBauza

A British street urchin Fanboy and Chum Chum occasionally cross paths with.
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* BritishTeeth: His teeth aren't very presentable.
* TinyTimTemplate: He's a British street urchin in ragged clothes.
[[/folder]]
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