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- Detective Conan's Ai Haibara is an eighteen year-old prodigy who has been shrunk down physically to age six or seven. Since she puts no deliberate effort into acting like a child, she tends to come off this to people who aren't aware of this fact. The degree to which this is true has dwindled with her Character Development as she's Took a Level in Cheerfulness over the course of the series.
- In The Mage Will Master Magic Efficiently In His Second Life, Zeff acts his appropriate mental age in comparison to, say, Milly, who is a year older physically but an actual Child Prodigy.
- Ace Attorney has the first introduction of Franziska von Karma, who, with perfect sentence structure, says she will be tutoring Edgeworth. At the time, she is about two or three.
- Throughout his long career as a superhero, Billy "Captain Marvel" Batson has been all over the map with regard to this trope. Averting this trope is generally regarded as an important part of his characterization, and was certainly part of the character at his conception. Billy is a 12-year-old boy who becomes a superhero in an adult body, and acts like it, reacting to the strange things he encounters with childlike enthusiasm. Various authors have forgotten this feature and played the trope straight, turning the adult Captain Marvel into someone with a personality indistinguishable from Superman. These runs are generally regarded very poorly by fans.
- Still, possessing the Wisdom of Solomon while in Captain Marvel form can help justify more adult behavior. Or at least a more adult level of awareness.
- Amethyst, Princess of Gemworld is a more subtle case of averting the trope, and then playing it straight, than Captain Marvel. Like Marvel, she was a 12-year-old who gained powers and age when she travels to a magical kingdom. Played less childishly than Captain Marvel, Amy still had a tendency to be emotionally immature at certain moments, and the original creative team had to remind certain readers in the letters pages that it was because Amy was still emotionally a 12-year-old, whatever she looked like. And then the creative team was kicked off the book and the "Amy Winston" aspect of Amethyst's character was basically dropped.
- Kid!Loki after his old self's consciousness took over his body began acting like this (see Young Avengers) not only more mature but also troublingly unchildlike. He even drank and flirted, which the others didn't take seriously because, well, he looked around 12. On the other hand he still didn't act the age appropriate to his actual age probably thanks to being a Man Child even as an adult.
- Harry Potter and the Methods of Rationality: Harry James Potter-Evans-Verres. And most of the other children, who act 3-10 years older than their physical age, depending on just how much training they've had.
- Charles Wallace from A Wrinkle in Time, which leads to him overestimating his capabilities, and gets him ensnared by IT. Charles Wallace is a little different, though. He wishes to be accepted by his peers, but finds that he cannot hide his intelligence, and gets bullied for it.
- Artemis Fowl... most of the time. Subverted in the beginning of The Lost Colony, when among his greatest nemeses is the distraction that is puberty.
- One of the first novels to feature a Child Prodigy was The Hampdenshire Wonder in 1911. The protagonist is not only a genius, but a truly superintelligent little kid who judges the whole human culture an "elementary, inchoate, disjunctive patchwork"... at age four and a half.
- Wensleydale in Good Omens: His parents "called him 'Youngster'. They did this in the subconscious hope that he might take the hint; Wensleydale gave the impression of having been born with a mental age of forty-seven." His favourite "comic" is Wonders of Science and Nature, and he insists on being the Only Sane Man in the face of Adam's ideas.
- Aaron Fidget in Hogfather:
Aaron: Let's be absolutely clear. I know you're just someone dressed up. The Hogfather is a biological and temporal impossibility. I hope we understand one another.
Death-as-Hogfather: Ah. So I don't exist?
Aaron: Correct. This is just a bit of seasonal frippery and, I may say, rampantly commercial. My mother's already bought my presents. I instructed her as to the right ones, of course. She often gets things wrong.
- John Green's An Abundance of Katherines has Colin Singleton, who started reading at 3, loves anagrams, and creates a mathematical theorem to detail his relationship with all of his 19 girfriends (all of whom are named Katherine).
- River Tam from Firefly is a subversion. She's shown, in flashbacks, to have been so smart that she could spot flaws in the textbooks Simon was studying from and uses surprisingly advanced terminology ("that whole section is fallacious"). It comes up because she's engaging in age-appropriate activities (like pestering her brother while he does his homework, and playing pretend that he and she are Alliance soldiers who have gotten cut off from their squad when the Independents brought in dinosaurs. Then suggesting they must resort to cannibalism).
- Manny from Modern Family. In one particular episode, he has been having conversations with a grown woman online and arranges a date, neither suspecting an age difference. "He's an old soul."
- Micah in Heroes.
- The "Dakota Fanning" series of skits on Saturday Night Live is made of this trope. An actress portraying a fictionalized version of Fanning behaves this way.
- In an episode of The WB show Everwood, Ephram talks about a young child and notes that she's mature "but without having that creepy Dakota Fanning '45-year-old-lady-trapped-in-a-10-year-old's-body' vibe."
- Star Trek: The Next Generation's Wesley Crusher is actually an aversion. Although he is a technical genius who understands the Enterprise as well as many of the crew, his emotional maturity is more like a typical teenager. This combination, along with the allowances Captain Picard gives him, are probably what made him so annoying to many viewers. However, he is one of the more believable depictions of a gifted child in fiction.
- Sheldon Cooper in The Big Bang Theory was this. When he was young, he had a diary of his toilet training, and was angry when his parents got him a motorized dirtbike instead of a titanium centrifuge for his birthday. He still had some childish traits, like his imaginary friends, only he called them imaginary colleagues and sent them home at the end of the day.
- Zig-Zagged by Calvin of Calvin and Hobbes. He's incredibly intelligent, well-spoken, and has a very solid grasp of concepts and ideas that many real-world adults struggle with, but at same time, he frequently uses his enormous vocabulary and razor-sharp wit to express the kind of thoughts any regular six-year-old would have.
- In Arcadia, Thomasina functions as a child with regards to romance and sex, and an adult with regards to intellectual matters (Classics scholar, mathematical genius). Which serves as a reflection of the Central Theme of the conflict between Romanticism and the Enlightenment.
- Van from Harvest Moon: Animal Parade prefers studying to playing, and always wants to know if your kid likes to read/go to school/do homework. He even teaches some of the other kids during events!
- The Whateley Universe has several examples. Ayla is a self-acknowledged one, and Jobe is one who doesn't realize it. Ayla's reaction to realizing this is to try and bring his friends up to his level, so that they can at least understand why some things bug him so much. ("Why would I blow money on an expensive stereo system that's going to be outdated in three months' time, or on clothes that are going to be out of style in two weeks?")
- Huey Freeman of The Boondocks has elements of this in both his comic and animated incarnations.
- As an example, in one episode of the animated series, his friend Jazmine says something about the Tooth Fairy. Huey responds by saying that the Tooth Fairy isn't real, the world is a hard and lonely place, no one gets anything for free, and everyone she loves will be dead one day.
- Egghead, Jr. in the Looney Tunes Foghorn Leghorn cartoons. He was always reading books and otherwise acting in an intelligent manner, and didn't want to do the childish things Foghorn Leghorn wanted him to do.
- Subverted with Polly from Stickin' Around. She plays off this trope accordingly, though it doesn't stop her from playing with the other kids.
- Stewie in Family Guy tends to zig-zag this trope.
- Dexter in Dexter's Laboratory adheres to the trope, except that his attitude toward girls remains entrenched in normal 9-year-old mode.
- Lampshaded in an American Dad! episode with a flashback of Steve's friends as toddlers:
Young Barry: Interesting how we've developed such a sophisticated hierarchy at this young age.
Young Steve: Shut up, Barry.
Young Barry: (enthusiastic) I'm at the bottom!
- Daria generally manages to play this fairly realistically: Daria is smarter than most of the adults she knows, but she is still lazy and pretty immature at times, particularly with her own emotions (which she'd rather just repress). Flashbacks depict her unable to connect with other children, but her six-year-old reading material is Black Beauty rather than, say, Homer in the original Greek.
- Zig-zagged by Lisa Simpson of The Simpsons, Depending on the Writer. She's a Child Prodigy who is usually far more mature than other children or even than most of the adults around her, identifying with world-weary jazz musicians and quoting existential philosophers. Every once in a while, though, the audience will be reminded that she's still an eight-year-old girl with details like her constant yearning for a pony or her subscription to Non-Threatening Boys Magazine and precocious crushes on teen heartthrobs named Corey.
- The title character of the very short-lived and critically-blasted Allen Gregory is an example gone awry, in that he was supposed to be extremely mature for his age, and promos made him seem like a tiny Frasier Crane. In practice, though, he was the other kind of "mature," and came off as a smug, creepy, unlikable sociopath.