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- Naruto, along with many other characters from that series.
- Nintama Rantarou.
- The Narutaki Twins from Mahou Sensei Negima! could be this trope.
- Black*Star from Soul Eater isn't called a ninja In-Universe, but he fits the trope.
- Shinobu from Ninin Ga Shinobuden is a total airhead. It doesn't help that she has a terrible teacher.
- Ninja Hattori-kun.
- The Teenage Mutant Ninja Turtles in most media. Michelangelo seems to fit this trope best of them in the later incarnations. Occasionally there are also flashbacks to the turtles' childhoods, when they were small adorable ninjas-to-be.
- El Hijo del Ninja, El Ninja Jr and Último Ninja on the Mexican circuit, the latter of whom debuted in his preteens. All three grew up to be respectable luchadors.
- Final Fantasy III features the Ninja job class. The protagonists are a group of fifteen-year-old kids. Do the math.note
- Yuffie from Final Fantasy VII.
- The ninja kids from the 3rd-gen and 4th-gen Pokémon games.
- Yomiko in Exit Fate, possibly.
- Jajamaru, from Jaleco's Ninja Jajamaru-kun video game series.
- Izuna, from Izuna: Legend of the Unemployed Ninja.
- Kid Niki, in Kid Niki Radical Ninja.
- Kat and Ana from the WarioWare series.
- Kay Faraday of Ace Attorney Investigations: Miles Edgeworth. As Edgeworth muses repeatedly, while she claims to be a Phantom Thief in training, she seems to actually want to be a ninja.
- Mini Ninjas - all of the playable characters are kids (preteens at the oldest)
- Hokutomaru from Garou: Mark Of The Wolves.
- Natsu, Taki's apprentice and Naruto's genderflipped Expy from Soul Calibur V.
- Ibuki from Street Fighter III is a high-school age ninja who struggles to balance her obligations to her clan and her desires for a teenage social life.
- Garu and Tobe from Pucca.
- In Marilith, Yulia's granddaughter Monika wants to be a ninja when she grows up.
- Robin's brother in The Wotch, due to being a Naruto fan.
- The McNinja family in The Adventures of Dr. McNinja have been trained as ninja since birth, although by the time the story begins both the Doc and his little brother Sean have aged out of this trope.
- In Game Grumps, Ninja Brian's daughter Ninja Audrey (age two) is more powerful than he is, although unlike him she doesn't have a Ph.D.