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- Masha from Masha and The Bear is said to be 3 years old and yet she can perform daunting tasks and speak properly.
Anime and Manga
- Former Trope Namer Shotaro Kaneda from Gigantor / Tetsujin-28go, or, as he's known in the United States, Jimmy Sparks, so embodies this trope that he's the trope namer for both this and Shotacon.
- Haré+Guu: Haré has to take care of his drunken partying mom(who is only in her 20s) and as the straight man ends up being driven crazy by Guu's craziness.
- Momiji Sohma in Fruits Basket, who makes his other family members jealous because his cute appearance can manipulate girls. Older than he looks.
- His cousin Hiro might also count, being an actual middle schooler (Momiji is a high-schooler who looks like a middle schooler) who is clearly much more responsible than his mother and gets extremely offended any time he thinks someone is treating him like a child.
- Momiji also grows up in the manga. Of course, Fruits Basket being a Shoujo series, he just becomes a Bishounen. He retains his personality, though.
- Negi of Mahou Sensei Negima! (pictured above) was the basic polite version earlier on in the manga, while Kotaro Inugami is more of a Mouthy Kid. Both of them, however, are extremely capable on their own. Due to Genre Shift and liberal use of magical age-up pills, Negi has this trope more or less beaten out of him by various physical and emotional trauma by the midpoint of the story, although he hasn't been broken of the habit entirely.
- Panzer World Galient: The Hero Jordy Volder is a surprisingly focused and capable fighter, considering the fact that he's merely 12 years-old.
- Lyrical Nanoha: Barrier Warrior Yuuno Scrya is a 9 years old archeologist and magic prodigy, the latter to the point of not even requiring a device to fend off Vita while he's analysing the magic prison spell they're in to find a way out.
- Rurouni Kenshin: Yahiko. Turns into more of a Cute Bruiser by the end of the series, to the point that he gets his own sakabato and a lot more responsibility in the epilogue.
- Mamoru Shimesu in Phantom Quest Corp.. He actually runs the company, the contacts, the finances, etc. while his boss Ayaka spends their funds on booze. He has a very stressful job.
- Though he's 13 (and then 14), Riku from Blood+ looks younger. He also acts much older, too.
- Hitsugaya Toshirou of Bleach also seems to suffer from this, except that a lot of people in the story do treat him seriously, because he's in a position of authority. Although he's Really 700 Years Old, he still suffers from this because the rest of the characters he works with are even older.
- Jim Hawkings in Outlaw Star, who is clearly the more mature of the group between him and his "aniki" Gene.
- Angel Sanctuary has Metatron as this. Yes, that Metatron.
- Naota from FLCL, an entire series based around him trying to act adult (to be a good Replacement Goldfish for his big brother) and being mocked for lapsing into childish behavior.
- Shingo Tsukino from Sailor Moon is like this (when he's not slipping into Annoying Younger Sibling mode). He's highly intelligent, more mature than his sister, and manages to charm quite a few ladies over the course of the series (both older and younger than him).
- Czeslaw Meyer of Baccano! deliberately tries to cultivate this image, despite being Really 700 Years Old. He claims he isn't used to being treated any other way.
- In D.N.Angel, there's the main character, Daisuke, and his rival, Troubled, but Cute Satoshi. Daisuke acts closer to the typical version, whereas Satoshi is a Wise Beyond His Years college graduate (despite being only 14).
- Revolutionary Girl Utena's Mitsuru Tsuwabuki, who is constantly bending to Nanami's every whim and taking care of her business, takes the desire to be treated like an adult to extremes - his rants during the Mikage Seminar and his duel with Utena border on the Ax-Crazy. "I want to become an adult and wreck the whole world! Wreck it!" "You become an adult by destroying other adults!" Or something to that effect.
- 13-year-old Wataru from Hayate the Combat Butler fits both the acting hard-working and responsible (he does pretty much run the head branch of his family's video rental franchise) and Mouthy Kid aspects of the trope. He doesn't have a big sister, although his maid Saki does fill the role.
- If Hayate wasn't just a bit too old to qualify, he would probably be the poster-child of this trope. The levels of Moe that boy radiates are staggering.
- Usso Evin in Victory Gundam, who is the second youngest Gundam protagonist at the tender age of 13 but also lived mostly alone and takes care of/is friends with the even younger 11 year old shakti. He hijacks a mobile suit mid-air singlehandedly for himself, and has to be blackmailed (in a way) to pilot the titular Gundam. In a aversion of this trope, people only make fun of him when he's being childish since whenever he's being serious... well, it's not funny.
- Mokuba Kaiba from the (second) Yu-Gi-Oh! anime. A clear case of Bowdlerization, since in the original manga he qualifies more as an Enfant Terrible (but responsible, for that). His big sister is a big brother.
- Boo from Now and Then, Here and There is adorable, loyal, protective, loving, responsible, mature, kind, innocent (but not for long), and realistic. He's also a child soldier, forced to fight in a mad king's army. The responsibility on his shoulders is staggering. Doesn't have a Cool Big Sis, but latches onto the series' Ensemble Dark Horse, even taking a bullet for him.
- Sayonara, Zetsubou-Sensei has Majiru, Nozomu's nephew, who looks to be around 7-9 and sorta looks like a mini version of Nozomu. A bit snarky/mouthy, but still cute. He's not actually responsible for anything, but he acts very mature and sophisticated for his age. And he & Kiri Komori seem to be developing feelings for each other.
- Shippo in Inuyasha is the equivalent age for a young kitsune and, despite being a crybaby at times, often takes delight in being more emotionally mature than Inuyasha himself.
- Black Butler: Ciel Phantomhive is a more dark take on the trope. The reason he acts serious and mature is the trauma he endured through losing his parents, and being kidnapped and tortured by cultists. He's now a driven, if jaded, Earl and owner of his own toy and candy company while he searches for the culprits in said torture.
- Sui Takishima, from Special A. Seeing as his big brother is basically perfect, it takes some persuasion by Hikari before Sui decides to actually do something. Once he does, however, he's almost as stuck up as Kei.
- Hanaukyō Maid Tai. Taro is only 14 years old but tries his best to act in a responsible manner as head of the Hanaukyo family, including looking after the maids' welfare. Although the maids technically are under his orders, they at least influence what he does most of the time and sometimes (as in head Security maid Konoe Tsurugi's case) try to order him around.
- Makoto from Wandering Son is only around 10 at the start of the story but is remarkably mature for her age, even compared to the other characters.
- 11-year old Takashi from Nicoichi is not only adorable but as a result of his fine upbringing, also very responsible and can easily lead an independent life by himself.
- Ryuu from Snow White with the Red Hair is 12 years old, and a full-fledged court pharmacist at the royal palace the story mostly takes place in. He takes helping his patients fairly seriously, though they tend to see him as a Creepy Child.
- Ken in Demashita! Powerpuff Girls Z is one of these kids, and is swings from being a Child Prodigy to being plain Adorkable, and the three Powerpuff Girls will often treat him like their cute younger brother (though they are not related to each other). Ken is an only child, living with his father (Professor Utonium) in Tokyo Laboratory, while his mother is an astronaut on the International Space Station.
- Chiyo from Azumanga Daioh. She's always in a good mood, very childish and cute as a button... yet also always knows the answers, helps her (high school) classmates, and is more mature than many of them.
- As a kid, Goku from Dragon Ball as well as his sons Gohan and Goten. Trunks from the main timeline also counts.
- Protagonist Niina from Hajimari No Niina: only 10, but with a very mature outlook on life as a result of being the reincarnation of a 16-year-old girl.
- While not part of one of the three main stories, Sekai-ichi Hatsukoi has Hiyori from the spin-off novel "Yokozawa Takafumi no Baai". Multiple characters, but especially Yokozawa himself point out several times that she is pretty mature for a ten year old. Justified since her dad is busy with work and a total clutz at home, so she is mostly responsible for the household. She has instances where she is a normal kid though (even though she greatly dislikes when people point it out).
- Ebisu's reincarnation in Noragami is this to a tee, having a strong understanding of Japan's economy and be empathetic to the needs of humanity while still being incredibly innocent and naive. Being a God of Fortune (specifically merchants) and have his Shinkis at his disposal, this shouldn't be hard for him.
- Syaoran Li from Card Captor Sakura, the 10/11-year-old rival-turned-love-interest who tries so hard to be serious and no-nonsense and mature (and for the most part does passably, keeping pace with Sakura in the capturing of Clow Cards in the earlier seasons and even living on his own in the manga continuity), but is still too small and cute for this to be truly effective, especially since he breaks out in a bright blush the second he's complimented or shown affection.
- Mara Wilson made a career out of playing this character in the 1990s.
- Tip from Home is quite mature for a young teen and often acts as the adult between her and her mother.
- Kevin in the first two Home Alone films.
- The Phantom Menace: Cute? Young? Super-Serious? Doesn't like to be treated like a kid? Family problems? Relationship with an older girl? Anakin Skywalker! Only in the first prequel, since Attack of the Clones takes place around ten years later and he's grown, well, quite a bit, like at least three feet.
- Older Than Television: The trope goes at least as far back to the detective novels of Edogawa Rampo (1894-1965, real name Hirai Tarou), whose protagonist Kogoro Akechi was frequently aided by the "junior detective" Yoshio Kobayashi. According to Wikipedia: "Kobayashi was written as a perfect young teenager who, some might say, had a strong 'dependency' on Mr. Akechi. Every time he appeared, he was either worried about Akechi's well-being or helping Akechi set the trap for criminals. On the numerous occasions that the boy was captured, Akechi swooped in for a timely rescue."
- Rare Western literature example - Eoin Colfer's book The Supernaturalist involved a 'kid' called Ditto who was Really 700 Years Old - okay, in his early twenties - but as he was a naturally-immature adult he occasionally cracked.
- Eoin Colfer also brings us Artemis Fowl, who at the beginning of the series is a twelve-year-old evil genius who plans to rebuild the Fowl family fortune using fairy gold.
- Markl from the movie of Howl's Moving Castle. He's generally more mature than his mentor, Howl, and yet still young enough to freak when a girl threatens to clean his room.
- Better yet, Howl's child disguise in the new sequel, House of Many Ways, fits this trope to a tee, as not only does he speak with an exaggerated lisp, but also is described to be ultimately cherubic with golden curls, adorable puppy-fat, and a lot of lace. It's even more ridiculous when his reasoning for adopting a jailbait disguise is simply because he had a horrid childhood (or so he says, Sophie immediately denounces him as a liar) and he has every right to relive being six years old... only prettier. But because it is only a ruse, he manages to surprise the main character, Charmain, into speechlessness when he drops all pretenses and acts very adult and down-to-business.
- Olver from The Wheel of Time fits this trope in-universe despite being described as downright ugly in the books. It probably has to do with when he follows his Big Brother Mentor Mat around to watch his back and tries to mimic the Warders.
- Otto in Someone Else's War is this trope Up to Eleven.
Live Action TV
- Flynn Jones of Shake It Up. He handwaves that he's "the only responsible person around here", and even got a model to like him, saying he's adorable.
- Doctor Sweets of Bones definitely qualifies. He's the youngest member of the team and cannot get himself taken seriously because of it, tends to lapse into Sophisticated as Hell mid psych-babble, looks up to the two main characters as Parental Substitutes, and is all around Adorkable.
- Nicki Reagan on Blue Bloods is in middle school, but dresses and behaves like a thirty-two year old. She isn't cowed by any of the Reagans, regardless of age, and seems to view herself as the matriarch of the family.
- Tim and Heather's youngest daughter Sophia astounds her parents with her intelligence in Life in Pieces. Tim has a hard time reconciling the fact that his daughter's so smart yet hadn't figured out that Santa Clause, the Easter Bunny, and the Tooth Fairy weren't real until someone told her.
- In an early comic strip from The Boondocks, Huey Freeman, a little black boy who is also a radical leftist activist, encounters a little old white lady. The old woman calls him adorable, but Huey is offended by this remark, and tries to rant about how he's not cute. But she ignores all of his points. (Also see the example in the Western Animation folder.)
- Taro of Disgaea 2 is a fairly straight example, though a bit of a Cloud Cuckoolander. He's sweet and more mature than one would expect and is absolutely adorable. He's not taken very seriously by anyone, though.
- There's also Emizel in Disgaea 4, although extremely young (for a demon), he's attempting to fill the role of Grim Reaper for his father. People don't take him seriously at all, but that's more because he's terrible at his job than his age. He's also clearly being played for cute, thanks to his bow tie and shorts.
- Ken Amada from Persona 3 seems like a typical one of these at first. He acts unusually mature and serious, and isn't taken all that seriously by the older party members. However, it's later revealed that he joined SEES so he could exact revenge on his mother's killer.
- Culotte of La Pucelle. He's generally much more mature than his Promoted To Parent big sister, and hates being treated like a child. He's also adorable.
- Jr. from the Xenosaga series plays with this trope. He's certainly set up to be a typical precocious child, acting far more mature than his tender years would suggest. However, he's generally taken seriously by everyone he meets, and we later learn he's actually pretty immature for his age, seeing as how he's chronologically in his thirties.
- Link definitely qualifies. None of his reincarnations are older than 16, some as young as 12, but he has no trouble taking the whole "fate of the world" thing in stride.
- Fire Emblem:
- Rolf from Fire Emblem Tellius certainly qualifies often putting a tough front despite being very sensitive and sweet.
- Sothe qualifies once we learn his backstory: he's been looking after and protecting Micaiah for years despite being younger than her.
- Genis from Tales of Symphonia qualifies very much. He's dang mature and can even be a Deadpan Snarker when he feels up to it.
- The professor's boy assistant Luke Triton from Professor Layton. Acts mature? Check. Isn't always taken seriously? Check. Played for cute? So very much check.
- Shinra from Final Fantasy X-2. He's a kid genius and often the least emotional of the Gullwings. A bit unusual in that he is wearing a suit that covers him completely, including his face.
- Pierre from Harvest Moon would be an almost archetypal example, between his cute, childish appearance, and his mature, sophisticated behavior... Except for that fact that no-one ever fails to take him seriously, even though he looks younger than every other character that's not explicitly a small child. Making this weirder, he's also an Expy for an especially grotesque Gonk.
- Alfred, the adorable younger brother to Maya and a member of the rival gang of Drifters in Wild ARMs 3. He's clearly more mature and level-headed than his impulsive, treasure-seeking sister.
- Hope of Final Fantasy XIII becomes this with character development. Although played for cute all along, he's a Bratty Half-Pint at game open, but he's become very mature for his age by the time the game ends.
- Riku from Kingdom Hearts was extremely perceptive and insightful at five years old, able to immediately spot an off-worlder and give Sora outstanding advice about a complicated issue.
- Bugsy from Pokémon, one of the youngest Gym Leaders in the series, but also one very dedicated researcher. And while he's always deep into his research (bug Pokemon in the game, ruins in the manga), he sometimes shows a very child-like enthusiasm about what he likes. It also adds to his charm that he's often confused for a girl.
- Another adorable and confusing nerd is Rief from Golden Sun: Dark Dawn. While his age is ambiguous, his appearance, voice squeaks, and behavior all suggest that he is on the young side of Golden Sun's traditional Kid Heroes.
- Though she didn't get much screentime or character development, Himi probably also qualifies due to her precognitive powers giving her a wealth of knowledge to draw from, and she's expressly described as "not much older" than the little kids playing in her hometown.
- Thirty years prior to them in Golden Sun: The Lost Age, Eoleo was a dorky-looking toddler too young to talk, but not too young to fake crying to throw off attention, experiment with his new Psynergy powers, break his father out of prison, and reason that Felix can solve the traps in Treasure Island that had the pirates stumped. And when addressed telepathically through Mind Read, he had a perplexing case of Little Professor Dialogue.
- Caillou from Recettear: An Item Shop's Tale is a good example of this trope. He's a powerful mage, running a serious investigation, but inside he's still just a kid who can't resist candy.
- Carl Clover from BlazBlue, despite being just a kid, he's a vigilante that has captured many criminals with the help of Nirvana. He always talks in a very professional matter and dislikes being treated as a kid. His attitude does hide a rather vulnerable side of him, though.
- Kiel from Rune Factory 4, though he's apparently old enough to marry and thus technically not a "child" in the strictest sense. He certainly looks it, though, and is a bit of a Ditzy Genius, reading tons of books but still being naive enough to take everyone at face value, even people he knows are practical jokers.
- Sonic the Hedgehog has three main ones: Miles "Tails" Prower from Team Sonic, Cream the Rabbit from Team Rose, and Charmy Bee from Team Chaotix. There are others that pop up every now and again in comics and TV shows, but these three are the only ones in the games.
- The Phoenix Wright character Pearl- despite being eight- speaks in a formal, verbose manner, and rarely takes anything lightly. This comes of spending her whole life in the archaic Fey compound, isolated from everyone but her (much older) family members-one of whom was deliberately grooming Pearl to be the next Fey leader. Still, she has a child's changeable emotions, naivete, and tendency to Squee!.
- The Autobiography of Jane Eyre: Adele Rochester works all the time for her futile homework assignment (though she's fond of learning), knows all about art forms of the twentieth century, speaks French, uses Latin in her tweets, has ballet/fencing/opera lessons, plays puzzles competitively, frequents Advanced Marine Zoology courses, went to an Applied Physics boot camp and is a Scout girl. She's very responsible, knows what she wants, and Jane says she kind of tutors herself. As is typical for precocious children, her family situation is complicated, to put it mildly. She surely knows a lot, but sometimes she has troubles to contextualize it and can come off as a weird kid. She's very nice to Jane, who is concerned about her being lonely and neglected by her father.
- In the first episode of The Boondocks, Huey Freeman attends a garden party full of rich white guests. Huey tries to talk about his political conspiracy theories, hoping that it will offend their conservative sensibilities. But instead he gets praised for being such an intelligent and articulate child, which annoys him to no end.
- Brainiac 5 in the Legion of Super Heroes cartoon was made into this kind of (pre-)Teen Genius for the first season, in contrast to his snarky Insufferable Genius characterization in recent comics.
- Tricks from Scruff is a Talking Animal version of this trope, being a young Border Collie pup with an easygoing, smart, modest but playful personality.
- Omi from Xiaolin Showdown.
- The titular character of Hey Arnold! OWNS this trope. Acts as if he's preocupied with responsiblity, once had a crush on an older girl (well, she was only two grades ahead), and one of the most adorable kids on the show.
- Flip Chan in The Amazing Chan and the Chan Clan. He acts responsible for Mimi, Nancy and Scooter when they're out on the case, and is quite a cute kid.
- Mimi and Scooter are no slouches in the cute department, either. Mimi usually pushes her authority on Scooter, who wants to launch head on into the episode's unsolved crime.
- Yugo from Wakfu is one of the most emotionally mature, yet earnestly childish examples of this trope.
- Most of the male KND Operatives in Codename: Kids Next Door ironically do quite a few things things you'd expect adults to do (usually when non-villain adults aren't around to notice) and yet the show still maintains the fact they're kids, given the KND is a military organization consisting entirely of children (with some areas in science, politics, etc.) so that would in ways make sense. Oh, and the boy KND Operatives are really adorable, just ask their fangirls.
- The titular characters of Phineas and Ferb, especially Phineas. Baljeet as well.
- Mac from Foster's Home for Imaginary Friends. He's intelligent, usually pretty mature for his age, has his childish moments, and is downright adorable.
- Similar to the KND example above, the male members of the Recess gang show shades of this. Especially T.J. and Gus.
- And the female ones. Gretchen is probably the prime example, being a child prodigy, rather level headed, but having most of the same inpulses and naivete as the rest of the group.
- To an extent, Doug Funnie is one of these. He's very responsible, though still acts like the average eleven-year-old. He's also one of the so-dorky-they're-cute types.
- Dipper Pines from Gravity Falls.
- Lance from Sym-Bionic Titan was this as a child.
- Orel Puppington, especially in Beforel Orel.
- Timmy Turner, A.J., Chester and indeed much of the main cast of The Fairly OddParents are this
- Robin from Young Justice, though he's thirteen and technically juuust outside of the proper age range. But since he's the youngest and the most experienced crime fighter of the six main characters, the effect is pretty much the same. See also: Billy Batson.
- Amberley of The Dreamstone has shades of this at times. She's noticeably more intelligent than Rufus and unlike him, seems to hold down her job rather competently. Most episodes have her act as a leader or strategist of the two. At times however, her bratty temper flares and she proves rather rambunctious.
- The eight-year-old Kate from Pelswick almost acts like the mom of the house, doing such things as trying to manage her father looking for a job and her older brother thinking about higher education.
- Penny Sanchez of ChalkZone, a Meganekko, Cute Bookworm, and the hero's best friend. She has been known to give lectures on quantum physics, as well as being the best student in her class.
- Spike, the iconic baby dragon of My Little Pony: Friendship Is Magic, is at least four years younger than the mane cast, but more often than not acts as a Straight Man to their antics, usually showing just as much (if not more) maturity and understanding of a situation. However, he often acts his age, usually when jealous or overeager to show results. Then again, this is a franchise where the adult characters constantly jump between holding down jobs and excitedly playing Pin-the-Tail-On-The-Donkey.
- Double D from Ed, Edd 'n' Eddy, to the point of cleaning his friends with napkins and occasionally scolding their immature behaviour as if he were their mother.
- Peedee Fryman from Steven Universe. In his debut episode he's gotten a job in his family's restaurant to impress his father, only to get depressed that he's been stuck with the lame mascot position. In subsequent episodes he's been promoted to deep fryer and seems much happier. His older brother Ronaldo, on the other hand, slacks off and has Peedee cover for him.
- Chloe Park from We Bare Bears is only a child and is already in college.
- Davis Cleveland. His tweets are proof of this and was brave enough to even be at peace with those who bullied him just because he defended his show.
- Subverted by Ruth Lawrence, a child prodigy who at nine succeeded in passing the advanced examination in pure maths that British school pupils do not normally do before eighteen. While she became the youngest undergraduate ever at Oxford University, it was noted that her brilliance in mathematics did not confer special maturity on her, and in all other respects she was a markedly opinionated ten year old girl who was hard for other undergraduates to relate to, and could on occasion be disruptive in a way the university was not equipped to handle. (While Ruth was undoubtedly precocious, she certainly was not adorable: fellow undergraduates went so far as to call her "obnoxious"). Oxford has since reviewed its policy for making such exceptional admissions.
- Featured all the time in photographer Anne Geddes ' work.