The world of anime boasts no shortage of powerful children, with characters like Sakura Kinomoto and Naruto Uzumaki holding the fate of the world in their adolescent hands. But for all the powerful child heroes of the anime universe there exist deadly anime kids with equally impressive, if dangerous, abilities. Anime never shies away from blessing young people with great power, and just like adults, anime children are easily corruptible. Unlike the most annoying anime children, many killer anime kids actually make compelling character studies. Since anime often tackles more "mature" topics, it stands to reason some series explore themes such as child abuse and trauma and how they might affect a young person.
Many of these kids are dangerous serial killers who easily hold their own against adults. Some possess formidable powers like Mariko Kurama from Elfen Lied, who uses telekinesis to rip apart enemies for fun. Maybe they're blisteringly intelligent like Johan Liebert of Monster, a child nihilist with plans to instigate the apocalypse. No matter what the reason for their brutality, adults are better off staying far, far away from the deadliest anime children.
Everyone in the Deadman Wonderland Prison is dangerous in their own way, but Hibana Daida is especially unsettling. At age seven, this girl became an Undertaker, meaning she survived the prison's brutal reform program and ranks as one of the worst and most savage inmates.
When Hibana was in kindergarten, a classmate flipped her skirt. Instead of telling him off or telling the teacher, Hibana reacted by killing not only him, but everyone else in her class. This was, she believed, an appropriate punishment. She also tortured and killed her abusive mother in retaliation for the pain she endured at her hands. In Hibana's eyes, her sadism is just one part of being the "good girl" her mother raised her to be.
Raised from birth to be an assassin as part of the Zoldyck assassin clan, 12-year-old Killua Zoldyck sees no problem in murdering anyone who crosses him in the bloodiest ways imaginable. Though capable of brutal violence, Killua can actually be an affectionate, fun-loving kid - until his bloodthirsty side comes out in battle. Due to his pride and loyalty to his friends, Killua will savagely murder anyone who crosses him or his acquaintances, as long as he's sure that he'll win. If he remains unsure of victory, he avoids the combat, since he doesn't want to endure the humiliation that comes with losing. Armed with a powerful Nen (aura), his metallic yo-yos, and an intellect far beyond his years, Killua is a young force to be reckoned with.
Although he inhabits the body of a child named Selim Bradley, Pride is actually the oldest homunculus created by Father. In his child form, Selim appears as a sweet, polite little boy who shows respect for his elders. All of his positive traits go right out the window when he turns into the monstrous Pride, a living shadow with rows of sharp teeth. As Pride, he sees himself as superior to humans, torturing and enslaving them for his own amusement. But he targets more than just humans - he also dismembers and consumes Gluttony, a fellow homunculus who was foolish enough to trust him.
Despite his amoral nature, Pride inexplicably enjoys life as a human child, and wishes he could fully inhabit his fake life and make it real. In the end, he manages to do just that.
Sachiko Shinozaki - 'Corpse Party'
Considering the fact Sachiko Shinozaki is the protagonist of an anime called Corpse Party, it comes as no surprise she's terrifying. At age seven, Sachiko was murdered by the principal of her school after she witnessed him attempting to sexually assault her mother. The gruesome circumstances of her death turned her into a vengeful ghost. Her vengeance takes the form of infiltrating people's dreams and destroying their brains until they become mindless puppets who are no truly longer human.