History ManChild / WesternAnimation

** Also Roger the alien. He was revealed to be over 1600-years-old yet he throws tantrums and some of his personas and disguises are that of children.
* Sterling Archer in ''WesternAnimation/{{Archer}}'', despite being a world-class secret agent, it also a brainless and immature MommasBoy who is often more interested in things like pirate lacrosse or ''Film/{{Aliens}}''-style space robots than the safety of his companions.

* ''WesternAnimation/MoonbeamCity'': [[CanadaEh Canadian-born]] police officer [[TheRival Rad Cunningham]]. [[PsychopathicManchild So]]. [[NotAllowedToGrowUp Very]]. [[UpToEleven Much]], to the point that it actually becomes weaponized by several characters in multiple episodes in order to resolve the plot.

** Patrick Star [[UpToEleven even more so,]] and is more than happy to play dumb games with [=SpongeBob=]. He has his own home, but unlike [=SpongeBob=], he doesn't even have a ''job''. TheMovie also shows that he's worn the exact same GoofyPrintUnderwear for three years straight.

[[caption-width-right:350:What can we say, Homie's a big kid.]]

** Princess Luna tries to assert an air of cool authority, but it doesn't take much for the mask to break and this trope to come out. Endlessly enthusiastic about everything, she has a HairTriggerTemper and will sulk endlessly if she doesn't get her way. She is desperate for authority, but tends to resent it when it is actually given to her. Appropriately she [[OneOfTheChildren gets along very well with children]].

* Launchpad [=McQuack=] from WesternAnimation/DuckTales2017 is referred as one by Mrs. Beakley. Seeing as how Huey, Dewey, Louie, and Webby come off as more emotionally mature than he to the point that seeing a scary movie convinces him that the film's fictional plot could happen in real life, she's not all that wrong.

* ''WesternAnimation/CodenameKidsNextDoor'': Ironically, most of the ChildHater villains have childish tendencies. In "Operation: F.L.U.S.H.", for example, five of the bad guys invade Sector V's treehouse. Knightbrace and Mr. Boss immediately start arguing over whose room they get to take like a bunch of siblings fighting over who gets the biggest room.

* ''WesternAnimation/CatDog'': Despite being an adult, Dog acts like a kid, for example he likes reading comic books, playing in the park, throws tantrums, and is rather naive and innocent. Cat even describes him as being "like a little puppy".

** Ice King also acts like this as he throws tantrums and treats being grounded literally. [[JustifiedTrope Unfortunately due to the magic of the Ice Crown which made his way.]] [[WithGreatPowerComesGreatInsanity Pretty much "sadness and madness" accompany anyone who uses magic,]][[WitchSpecies and it's notable that wizards are technically their own race.]]

* Toki Wartooth from ''WesternAnimation/{{Metalocalypse}}''. He has a teddy bear, eats candy, collects model airplanes, says "Wowee", and has a childish naivety for certain subjects such as sex. He also drinks, swears, and [[spoiler:goes on the occasional murderous rampage]].

* Gary Goodspeed, the BadassAdorable protagonist of ''WesternAnimation/FinalSpace'', is 32-years-old but acts [[YoungerThanTheyLook (and looks)]] about half that age; although it should be noted that he [[CharacterDevelopment matures]] throughout the series, he still retains a bubbly and childlike disposition. he's especially this in regards to his attachment to [[TrademarkFavoriteFood cookies]], observed in this classic exchange from Episode 10:

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** The Earl of Lemongrab is an interesting version of this. Physically he's eighteen at the youngest, but because he was born in a laboratory, he's only about one year old chronologically. He acts like a bratty little kid trapped inside the body of an adult, mainly because he IS a very young brat who happens to be an adult, too.

** Stan Smith as he is 42 years old but he has shades of acting childish at times. It's revealed that this the result of being forced to grow up fast as his father left when he was ''eight'', and thus had to be man of the house. When he goes into a bounce house to put a stop to Steve's party, he enjoys it so much he remains there for ''days.'' Roger himself notes that Stan's inner child is screaming to get out.
** Also Roger the alien. He was revealed to be over 1600 years old yet he throws tantrums and some of his personas and disguises are that of children.

* The animated version of ''WesternAnimation/{{Beetlejuice}}''. The majority of the inhabitants of the Neitherworld are fairly mature. Beetlejuice most likely expired in his late 30s, but he's mentally about eight, and a childish prankster who hangs around with a twelve-year-old Lydia in an IntergenerationalFriendship.

* Mr. Delmas of ''WesternAnimation/CodeLyoko'' has shades of this--plays games on his computer, for instance.

* Captain Hero from ''WesternAnimation/DrawnTogether'' is revealed in the pilot episode to be a 28 year old superhero yet he wears diapers, wets the bed, and throws tantrums. He also crosses into a psychopathic version of this frequently and is considered to be very dangerous through this tripe.

* Gary Goodspeed, the BadassAdorable protagonist of ''WesternAnimation/FinalSpace'', is 32 years old but acts [[YoungerThanTheyLook (and looks)]] about half that age; although it should be noted that he [[CharacterDevelopment matures]] throughout the series, he still retains a bubbly and childlike disposition. he's especially this in regards to his attachment to [[TrademarkFavoriteFood cookies]], observed in this classic exchange from Episode 10:

** Philip J. Fry plays video games, watches TV, drinks soda by the gallon, does anything if he's dared to do it, and has no ambition in life except for love. He's that flat mate that you knew who just can't seem to truly grow up (...and is often fully aware of it. Refer to his one ambition for why this is a source of gloom for him often), but at least he's cool to hang out with. His arc over the show matures his outlook enough to [[spoiler:make him marriage material]] while leaving his childlike sensibility intact, and if ''Bender's Big Score'' is any indication, [[spoiler:he's destined to become a reliable adult—just at a slower rate than most.]]
** Doctor John A. Zoidberg is over 80 years old, yet he plays with toys and throws tantrums whenever Hermes is mean to him.

** Bender is a first-order PsychopathicManchild. {{Justified}} in that [[spoiler:being a robot, he's only 3-4 years old, although fully adult, when the show starts.]]

** Soos is described as this by the show's promotional material and website. Given that he's a semi-CloudCuckoolander who's OneOfTheKids, this is a given. Even said so by Grunkle Stan in the season 1 finale, saying "you're a good man... child, Soos".

** Dukey is an 11 year old dog (he should be 77 in dog years) yet he sounds like a 20 year old. He plays video games, cries whenever he thinks his birthday is forgotten, dresses like a teenager, and often whines.

** Luanne Platter from the later episodes when she began dating and eventually married a moronic, middle aged, hillbilly "Lucky" to the point where she acts like a five year old most of the time.

* ''WesternAnimation/KingRollo'''s daily schedule is indistinguishable from that of a five-year-old boy. His kingdom doesn't seem to suffer too much from his behaviour, though.

** Also Aang and Katara's son Bumi although he's a middle aged man he acts like a hyperactive, childish prankster, his sister Kya lampshades this at one point:

* WordOfGod on ''WesternAnimation/{{Madagascar}}'' and ''WesternAnimation/ThePenguinsOfMadagascar'' is that RidiculouslyCuteCritter Mort the mouse lemur, who looks and acts like a child, is [[OlderThanTheyLook the lemur equivalent of a thirty-five-year-old]]. Julien has tendencies this way as well; he's constantly demanding attention and throws tantrums when he doesn't get what he wants, but at the same time gets very upset and starts talking to his plush toys when he's lonely, and [[spoiler:it's revealed via the magic of the Golden Squirrel that his greatest desire is simply to have his friends near him]].
* While it's not clear how old the Ferocious Beast in ''WesternAnimation/MaggieAndTheFerociousBeast'' is, he appears to be relatively physically mature. However, he acts more like a four-year-old, and six-year-old Maggie is far more levelheaded and responsible in comparison.

** Pinkie Pie [[GenkiGirl acts like an excitable six year old]] and seems [[{{Cloudcuckoolander}} incapable of holding a serious conversation or actually reading the mood]]. She can be surprisingly neurotic and [[InnocentlyInsensitive insensitive]] whenever events aren't as exciting as possible or if she isn't getting the kind of attention she wants.

* Most of the adults on ''WesternAnimation/{{Rugrats}}'' are portrayed as more absent-minded than one would expect a parent with an infant to be, but Stu Pickles ranges from "immature adult" during arguments and short feuds with his older brother Drew, to what can only be described as "borderline mentally deficient" at seemingly random times. In "[[Recap/RugratsS3E12CuffedTheBlizzard The Blizzard]]," he runs into the kitchen and screams "Yippee, school's been cancelled!" after a big snowstorm, at which point Chas has to remind him that he's 35 years old and doesn't have to go to school anymore. In "[[Recap/RugratsS2E2ChuckieVsThePottyTogetherAtLast Chuckie Vs. the Potty]]", he rushes to get Chuckie's potty while Chuckie is in the bathroom— Didi tells him to "put it down," and Stu puts it down right where he's standing... outside of the bathroom. Even Chuckie probably realizes that the potty doesn't belong in the hallway.
* The title character of Creator/{{Terrytoons}}' ''WesternAnimation/SidneyTheElephant'' shorts is 44 years old, but often shown to be extremely childish in demeanor. The short "Sidney's Family Tree", for example, has him beg other animals in the jungle to adopt him as their son. He is eventually [[InterspeciesAdoption taken in by a monkey]], much to the dismay of her husband.

** Bart encounters a former student of Springfield Elementary who's basically an adult version of him. He never matured beyond being a 10-year old prankster. He still lives with his mother well into his late teens, doesn't have a job, dresses like a child, and spends all his time and energy on childish pranks. Bart attempts to help him by getting him a job for Krusty The Clown, but what really turns him into a mature person is [[spoiler: getting a girlfriend.]]

** Count Venamus literally goes into his 12 year old self in "Noob vs Venamus 12". Because of this, he gets fascinated with light up sneakers and candy.

** Surfer dudes Geoff and Brody are 19 years old yet they both act like children.

* ''WesternAnimation/TimeSquad'': Buck Tudrussell is shown to be a man somewhere in his 30's yet he frequently acts much like the age of his 8 year old time traveling partner, Otto, as Tudrussell sometimes throws tantrums, sleeps with a teddy bear, and sucks his thumb. His other time traveling partner, Larry 3000 even calls Tudrussell a man child in " Ex Marks The Spot".

** Cosmo, despite being thousands of years old, he acts immature at times, and still wears diapers.

* Gary Goodspeed, the BadassAdorable protagonist of ''WesternAnimation/FinalSpace'', is 32 years old but acts [[YoungerThanTheyLook (and looks)]] about half that age, especially in regards to his attachment to [[TrademarkFavoriteFood cookies]].

-->'''Gary:''' What!? ''NO!'' GIMME A COOKIE! ''I will never, '''ever''' outgrow a cookie!!''

-->'''Gary:''' What!? ''NO!'' GIMME A COOKIE! ''I will never, ''''ever'''' outgrow a cookie!!''

* Gary Goodspeed, the protagonist of ''WesternAnimation/FinalSpace'', is 32 years old but acts [[YoungerThanTheyLook (and looks)]] about half that age.

** Cinnamon Bun is shown to be "basically 30" yet he owns a night light and cries a lot like a child while looking up to KidHero Finn. Turns out this is [[JustifiedTrope because he wasn't finished developing,]] as in he was literally ''undercooked.'' Going to help Flame Princess by moving to the Flame Kingdom allows him to grow by literally being able to finish baking. He becomes much more competent and mature (also a lot bigger, going from Finn's height to about ''twice that ''.) He's still kind-hearted and he still looked up to Finn to emulate him as he grew (he named his giant fire wolf steed Jake II for starts.)

** Soos is described as this by the show's promotional material and website. Given that he's a semi-CloudCuckoolander who's OneOfTheKids, this is a given. Even said so by Grunkle Stan in the season 1 finale, saying "you're a good man...child, Soos".
** Deputy Durland and Sheriff Blubs also qualify as they both love reading spooky ghost stories and making friendship bracelets and went candy hunting on Halloween. They also giggle like children a lot. Durland is shown to be a bigger one than Blubs.

** Every adult in Dimmsdale is this.

* Ray Stantz, one of ''WesternAnimation/TheRealGhostbusters'', is a more subdued version of this trope. While mature and perfectly capable of looking after himself, Ray still possesses an almost childlike idealism and enthusiasm for life. Ironically, this actually helps the Ghostbusters lure the Boogieman when they learn that the monster is attracted to people who think like children.

%%* Randy Marsh, Stan's father from ''WesternAnimation/SouthPark'', has become this in recent years.

%%** Patrick Star [[UpToEleven even more so.]]