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- In Ace Combat The Equestrian War Cloud Kicker, one of main heroines, has a very childish personality most of the time.
- Downplayed and explained in A Growing Affection by Naruto. Most evident when he's giddy at the prospect of building sand castles. At age 16. However when Ino tries to lampshade it, Naruto points out his childhood. Ino immediately shuts up.
- In Batshark, a Fusion Fic combining a cartoon crossover with Batman, Elliot the deer plays Two-Face as a half-adult-half-manchild as opposed to a half-lawyer-half-criminal. And then there is the fusion of The Joker and The Warden...
- In Death's Design, Fate's Plan Hermione referred to Sirius as a "man child without the ability to grow up." Sirius replied that Harry's mother once said something very similar to him and Remus commented that every female he knew had said something similar at one time or another.
- Likewise, in The Life of the Legendaries, Legendaries Mew and Jirachi are extremely immature and have many, many childish habits.
- The Grand Ruler from My Little Unicorn. He likes to play hopscotch.
- In The Last Casualties Voldemort put Harry's parents into suspended animation in a pocket dimension for thirteen years instead of killing them outright. Lily called James a man child in exasperated affection when he gave Snape a "welcome back present" by turning his robe pink. Although going by canon, James and Lily were 21 when they were killed.
- In Poké Wars, Mew is depicted as being incredibly immature. As evidenced by his words upon meeting Latias.
Mew: Hi. I'm Mew. Wanna play?
- In The Power of the Mind Remus referred to Sirius as "special" while apologizing for his behavior to a Muggle salesclerk. Harry later asked if there was any truth to that because Sirius was the biggest man child he'd ever met.
- Beelzebub from Sonic X: Dark Chaos is an immature drug-fueled hedonist that would easily be the poster for a man child if he wasn't also incredibly dangerous.
- Dragon Ball Abridged portrays Nappa as this. In this story, he is a borderline retarded Psychopathic Manchild whose dialogue mainly consists of non-sequiturs and random annoyances to his partner Vegeta to the point that "Goddammit, Nappa!" has become his Catch Phrase.
- Pacific: World War II U.S. Navy Shipgirls has Chester, who treats other peoples' weapons like toys and throws them around without second thought, not to mention acting childish even during the middle of combat.
- Ringo Starr's persona in The Beatles. They generally gave him rather sweet, childish songs to sing, like "With a Little Help From My Friends", "Yellow Submarine", and "Octopus's Garden" (which he wrote himself).
- Blink182's "What's My Age Again?" is about a 23-year old who is about to get laid, but he gets distracted by the TV, so the girl leaves, and he prank calls her mother in retaliation.
- Buckethead, the stage persona of musician Brian Carroll, is generally built around being both childish and a little creepy. It's common for Buckethead to play with toys and trade them with the audience during his live performances. He'll also avoid talking or giving interviews in general, except in a few recorded ones where he uses his scary mask / puppet Herbie to "speak for him".
- Counting Crows' "Round Here", is about not having a conception of what being an adult means, "Round here we're never sent to bed early, no one makes us wait. Round here we stay up very, very, very, very late"
- The Idle Race's "I Like My Toys", which deals with a thirty-one year old man's desire to play with his childhood toys instead of looking for a job, much to his parents' chagrin.
- The late Michael Jackson is often said to be one, due to his building a personal amusement park in his home, Neverland Ranch (whose name also connotes this trope) and from being badly abused and denied a childhood when he was young.
- In the movie The Wall, it's implied that Old Pink is one. For example, when a girl seduces him in his hotel room, he responds by trashing up the place; in "The Thin Ice" he's seen watching a Tom and Jerry cartoon on the TV; and, in "Is There Anybody Out There?" when he's building a mandala/replica of a military barracks/whatever it's supposed to be, a battery-powered toy robot is visible among the props.
- Weezer's song "Dreamin'".
- Jonathan Richman poses as one to boast his innocent songs.
- "Manchild" by Eels from their album Beautiful Freak about his sister who committed suicide in a mental institution.
- Joni Mitchell's song "A Strange Boy" from the album Hejira is about a lover who shares some man child traits:
What a strange boy
He still lives with his family
Even the war and the navy
Could not bring him to maturity.
- Cabin Pressure gives us Arthur Shappey, the relentlessly cheerful and optimistic steward of the aeroplane who is gullible to the point of idiocy, gets ridiculously excited over Christmas, still lives with his mother, genuinely thinks it's possible for something to be bigger than the box it's in, has discovered the secret to true happiness, and thinks everything and everyone is utterly ''brilliant''. And who once killed a man.
- Alexis Laree in Bad Boys Of Wrestling. She mistook birth control for candy.
- Find an archive that houses Abyss's career (at least starting with the Abyss gimmick) and marvel as he gradually transitions from a Wrestling Monster in Puerto Rico and NWA to asking if Jacqueline on his lap means he's no longer a virgin in TNA.
- R-Truth after being betrayed by John Morrison on WWE Raw, rapidly descended into an madness and childlike behavior.
- The Rock's criticism of John Cena basically boiled down to The Rock seeing Cena as a giant child. Cena had a counter argument, though it didn't endear him anymore.
- Willy Wonka in the 2013 musical version of Charlie and the Chocolate Factory is a downplayed version. He has a distinctly adult air of authority and elegance, but at the same time has childlike wonder, enthusiasm, impatience, creativity, and — to a lesser extent — innocence, rather Ambiguous Innocence at that.
- Batman loves the circus in Holy Musical B@man!:
Alfred: You can't stay in your pillow fort and cry forever.
- The Green Role from the Reduced Shakespeare Company's Ragtag Bunch of Misfits. Being the Man Child of the group is his defining characteristic.
- The clown in Cirque du Soleil's Saltimbanco, Eddie, is quite childlike as he pulls pranks on others and engages an audience member in a pantomimed Wild West shootout. In fact, he might actually be the adult form of the Child seen early on, if a transitional scene is anything to go by.
- Peter Pan is one in Shrek The Musical:
Peter: Maybe if we all close our eyes and clap really hard!
Pinocchio: Oh, grow up!
Peter: I won't grow up!
Pinocchio: You're thirty-four and need a shave!
- Tobias Ragg from Sweeney Todd: The Demon Barber of Fleet Street can be played several ways, and this is one of them. Bonus points if he is still childish because of insanity and/or mental retardation, both common portrayals. The Movie made him an actual pre-pubescent boy, a method that is much harder to pull off on-stage, mostly because labor laws require underage performers to be doubled.
- The Complete History Of America Abridged depicts Ronald Reagan as an irresponsible overgrown lap-boy with an undersized puppet body who calls Nancy "Mommy."