Being from Kirigakure, Zabuza excels in water-oriented jutsu, some of which are exclusive to him. With Water Release: Water Dragon Blast Technique (Suiton: Suiryūdan no Jutsu, Viz "Water Release: Water Dragon Missile") he can form a dragon from the surrounding water to attack others as needed. His Water Release: Great Waterfall Technique (Suiton: Daibakufu no Jutsu, English TV "Water Style: Giant Vortex Jutsu") allows him to fire a massive spiraling blast of water at an opponent. In addition to the offensive capabilities of his water jutsu, Zabuza is very skilled in assassinations. By blanketing the area in mist with Hiding Mist Technique (Kirigakure no Jutsu, Viz "Art of Hiding in the Mist"), Zabuza can blind an opponent and use his training as an ANBU to find them based on the sounds they make. Once found, Zabuza uses Silent Homicide Technique (Muon Satsujin Jutsu, English TV "Silent Killing Jutsu") to kill the opponent without their noticing his presence. This talent with assassinations is very well-known, as even the ninja of Konohagakure are familiar with Zabuza's history.
Zabuza is hired by Gato to kill the bridge builder Tazuna. After his initial attempt fails to kill Tazuna and his escorts (Kakashi Hatake and his students) and leads to his defeat, Zabuza and Haku seek a rematch after he recovers. Once tracking down Team 7 again, Zabuza is drawn into battle with Kakashi while Haku deals with his students. Although he tries to avoid Kakashi, he is eventually restrained and Kakashi prepares to kill him with his Lightning Blade. Before he can land a blow, however, Haku appears to use himself as a human shield for Zabuza, fulfilling his promise of being a tool for his master. Zabuza is freed as a result of Haku's intervention and tries to attack Kakashi, though Kakashi is able to avoid the attack and make both of Zabuza's arms useless. With Zabuza no longer able to fight, Gato arrives with his henchmen to finish the job instead, ending the battle between Zabuza and Kakashi. Naruto Uzumaki, however, is angered that Zabuza has yet to show remorse for Haku's death and explains Haku's devotion to him. Brought to tears by his words, Zabuza reveals that he did care for Haku and decides to repent for what he has done. After taking a kunai in his mouth, Zabuza charges through Gato's men, being stabbed multiple times along the way though eventually reaching and killing Gato. After collapsing due to his injuries Zabuza asks to be brought to Haku's side, wanting to be by his side in death as Haku was by his in life. Kakashi complies, and in his dying moments Zabuza wishes to go to the same afterlife as Haku.