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Raised by her ex-CIA father to be a ruthless killing machine, Hanna makes everything a weapon and relentlessly pursues her target. Raised in Finland, so you know she's a serious person.
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Mathilda, The Professional
Thirteen-year-old Natalie Portman made her film debut as a vengeful orphan who wants to be an assassin. The young actress somehow manages to appear more badass than Jean Reno, even though he kills dozens of people and is French.
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John Conner, T2: Judgment Day
The future savior of the human race had a bad hair day that lasted most of his adolescence, but Edward Furlong's 13-year-old John won us over when he successfully hacked into an ATM. At the time, this seemed mildly rebellious. Today, John would probably have a successful career in the financial sector.
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Feral Kid (a.k.a. Boomerang Boy), The Road Warrior
He makes animal noises, does backflips, and kills people with a sharp-edged boomerang. He's basically Bamm-Bamm from The Flintstones, except Australian and cooler.
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The Monster Squad, The Monster Squad
These kids fight a mummy, a werewolf, a Frankenstein, a creature from the non-trademarked corner of the black lagoon, and Dracula. That's pretty cool. But seriously, what else was there to do before the Internet?
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Dash, The Incredibles
Dashiell Robert Parr has super-speed, which is the third-coolest superpower behind invisibility and having a slug-based digestive system. Dash can run so fast that he runs over water. Biblical!
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Hit Girl, Kick-Ass
Purple-haired, foulmouthed, a great lover of firepower but also well schooled in swinging double-bladed swords, Hit Girl clearly does not play well with others.
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Tran, Tropic Thunder
The leader of the heroin-producing Flaming Dragon gang, Tran knows martial arts and has access to lots of heavy weaponry. But he has a heart of gold — just look at how much he likes Simple Jack.
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The Three Ninjas, Three Ninjas
Schooled in ninjutsu by their grandfather, these three brothers were given cool new ninja names: Rocky, Colt, and Tum Tum. (Well, two of them got cool names.) They later defeated Hulk Hogan in the correctly overlooked 3 Ninjas: High Noon at Mega Mountain.
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The lone survivor of a colony exterminated by a xenomorph outbreak, Newt lived for weeks in the murky ducts and pipes of LV-426. She also managed to outlive an entire squad of Space Marines.
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The Martin Boys, The Patriot
They helped their father decimate an entire redcoat patrol. Sound horrifying? Brother, these kids were raised by Mel Gibson. They've seen it all.
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Christophe (a.k.a. The Mole) South Park: Bigger, Longer & Uncut
Like some other kids on this list, the Mole chain-smokes, swears, and has a cool accent. Unlike the other kids, his greatest enemy is God. And also guard dogs. But mostly God.
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Hayley Stark, Hard Candy
Ellen Page plays 14-year-old Hayley, a seemingly adorable girl who bonds with a 32-year-old man online over a shared love of Goldfrapp. The man turns out to be Jeff, a skeevy sexual predator. But don't worry — Hayley has some horrible, horrible plans for Jeff.
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Claudia, Interview with the Vampire
Kirsten Dunst was 10 when she played a little girl rescued from a plague death by the bite of a vampire. Unfortunately, an eternity as a bloodsucking preteen drives Claudia a little bonkers. But it's so cute the way the blood runs down her cheeks!
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Gogo Yubari, Kill Bill: Volume 1
A 17-year-old sociopath, Gogo is first introduced disemboweling a drunk who tries hitting on her. But she's really just a normal kid. She has hobbies (like practicing with her meteor hammer) and a good, solid group of friends (the masked bodyguard gang known as the Crazy 8). And she loves school so much, she wears her uniform everywhere! Finally, a good role model for our children!