Naruto (manga)
One of Naruto's first opponents. He was a member of Hidden Mist's Seven Swordsmen of the Mist, a group of ninja that use particularly large swords in battle. He killed his whole class as part of a graduation ritual. Zabuza has a large sword called the Executioner's Blade. The Executioner's Blade can repair itself by absorbing the iron from blood. Zabuza had an apprentice named Haku. Haku could use the Ice-Style Kekkei Genkai.  Zabuza and Haku became rogue ninja after trying to take over the Fourth Mizukage. They worked for a crime boss named Gato to get money to try again. Zabuza died after he was betrayed by Gato.  Kabu brought Zabuza and Haku back to life.