Naruto

As an infant child, Naruto Uzumaki had the Nine-Tailed Demon Fox sealed inside of him by his father. Twelve years before the start of the series, the Nine-Tailed Demon Fox attacked the hidden village Konohagakure, destroying it and slaughtering many people. In response, the leader of Konohagakure and its ninja military; the Fourth Hokage; sacrificed his life to seal the demon inside Naruto.