Zabuza Momochi

was a missing-nin from Kirigakure, and the first major antagonist of the series.

Background
In the past, Kirigakure had the practice of pitting Ninja Academy graduates against each other in a battle to the death for a final exam. When Zabuza, not yet a student himself, killed all one hundred of that year's students, the practice was discontinued. Zabuza would thereafter be known as the "Demon of the Hidden Mist." His fame grew over the years, as he became both an ANBU and a member of the Seven Ninja Swordsmen of the Mist. He also killed the Konohagakure ninja Kumade Toriichi. At some point he discovered Haku, a child with a special kekkei genkai and began training him to be the ultimate weapon. In the anime, Zabuza was shown to not have helped in the village's defense against the Kaguya clan. Soon after this, he attempted to kill the Mizukage in a failed coup d'état, and subsequently fled with Haku and some other followers, such as the Demon Brothers.

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Land of Waves arc
In order to gain funds for a second coup d'etat, Zabuza became a mercenary assassin for hire. As one of his jobs, he was hired by Gatō to kill a bridge builder named Tazuna. When the Demon Brothers were sent to eliminate Tazuna and failed, Zabuza decided to take care of him personally. Upon tracking down his target, Zabuza found that Tazuna was being protected by Kakashi Hatake and his students. Wanting to test his ability, Zabuza challenged Kakashi to a battle, and Kakashi complied by revealing his Sharingan.

Soon after the battle began, Zabuza managed to catch Kakashi off guard, and trapped him with his Water Prison Technique. Needing to stay with Kakashi to keep him imprisoned, Zabuza sent a water clone to kill Tazuna and the rest of Kakashi's team, believing it to be a simple matter. Naruto Uzumaki, however, managed to sneak up on Zabuza, forcing Zabuza to release Kakashi. Freed, Kakashi and Zabuza resumed their battle, though Kakashi's Sharingan quickly gave him the upper hand. Copying Zabuza's Water Release: Grand Waterfall Technique before he could use it, Kakashi managed to defeat Zabuza.

Before Zabuza could be killed by Kakashi, however, Haku appeared, disguised as a hunter-nin, and threw two needles into Zabuza's neck, apparently killing him. Taking Zabuza's body away, under the guise of needing to destroy it, Haku revived Zabuza, the needles having been used to paralyze him. Although Zabuza's life had been saved, he needed a week to recover, and he planned to kill Tazuna and Kakashi then.

A week later, Zabuza and Haku appeared before Team 7 for a rematch. As Haku dealt with Kakashi's students, Zabuza dealt with Kakashi. Having been told how the Sharingan worked by Haku, Zabuza blanketed the area in a thick mist, to avoid falling prey to the Sharingan's influence. In doing so, Zabuza was able to slash Kakashi with his sword, greatly damaging his opponent. Kakashi, however, allowed himself to be attacked, and summoned his ninken to sniff out the blood, now on Zabuza's sword, to track and pin him down.

With Zabuza unable to fight back, Kakashi prepared to kill Zabuza with his Lightning Cutter, and charged at Zabuza. Before the Lightning Cutter could meet its mark, however, Haku appeared as a human shield, and took the full force of the attack, fulfilling his promise of being a tool for his master. Freed as a result of Haku's intervention, and not willing to allow the opening Haku had created to go to waste, Zabuza tried to slash through Haku's body to kill Kakashi, though Kakashi was able to avoid it and disable Zabuza.

With Zabuza no longer able to battle, Gatō arrived, and revoked their agreement so that he could have his own henchmen kill Tazuna instead. No longer having a reason to kill Tazuna, Zabuza ended his battle with Kakashi, although Naruto was not satisfied by this. Angered that Haku died for Zabuza, while Zabuza had shown no signs of remorse, Naruto lectured him on the feelings Haku had for him, and the loyalty he felt towards Zabuza.

Brought to tears by Naruto's words, Zabuza revealed that he really did care about Haku, and valued him higher than a simple tool. Wanting to repent for what he had done, Zabuza took one of Naruto's kunai, and charged through Gatō's men to get to Gatō, being stabbed multiple times along the way. Upon reaching Gatō, Zabuza killed him, and collapsed due to his injuries. As Gatō's men fled, Zabuza asked Kakashi if he could be brought to Haku, to which Kakashi complied. Being by Haku's side in death, as Haku was by his in life, Zabuza wished that he could go to the same place as Haku. Kakashi believed that they would be able to go to that place together. Team 7 buried them next to each other, with the Decapitating Carving Knife stabbed into the ground.

Legacy
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Trivia

 * Zabuza's