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Anime and Manga
- Batgirl - The Cassandra Cain Batgirl is a teenager trained to be an assassin, but whose empathy for human beings prevents her from ever actually going lethal.
- The Black Belt Club - A children's book series about four young martial artists who go on secret missions.
Live Action TV
- Kung Fu Kids - A Philippine TV series tells the story of seven kids of different personalities united by a prophecy. The Kung Fu Kids train under the village idiot who turns out to be a Kung Fu master from China.
- Kung Fu Kid - A 1987 Sega Master System video game about a kid that uses his knowledge of kung fu to fight enemies.
- Avatar: The Last Airbender - the young heroes (and villains), though proficiency in kung fu is pretty common in that world regardless of age.
- Toph Beifong was born blind and learned her own (vastly superior) earthbending without her parents ever finding out. Not only that, but she invented- invented - a brand new form of bending thought to be impossible (metalbending)... at twelve years old.
- A straighter example of this trope is present in the Sequel Series The Legend of Korra. Korra, the new Avatar, first started earthbending when she was five years old, something completely unheard of in the history of the Avatar. Even Aang, the youngest Avatar to ever master all four elements, didn't start learning his second element until he was twelve; and most Avatars don't even find out their identity until they turn sixteen.
- Referenced by name in the Kung Fu Panda: Legends of Awesomeness episode "The Kung Fu Kid", starring Peng the young snow leopard...who although he claims to have had no formal kung fu training and is just a potter, is able to go toe-to-toe with Po, Temutai, and even Shifu and the Furious Five while under More Than Mind Control. Justified by it being In the Blood.