Zabuza Momochi

Zabuza Momochi (桃地再不斬, Momochi Zabuza), given the moniker Demon of the Hidden Mist (霧隠れの鬼人, Kirigakure no Kijin), was a missing-nin from Kirigakure's Seven Ninja Swordsmen of the Mist, and the first major antagonist of the series. 

Source: http://naruto.wikia.com/wiki/Zabuza_Momochi

Background

Zabuza during his time as a Kirigakure ninja.

During the term of the Fourth Mizukage, Yagura, Kirigakure began the practice of pitting Academy graduates against each other in death matches as a final exam with the exceptionally skilled students named prime candidates for the Seven Ninja Swordsmen of the Mist. After Zabuza, not yet a student himself, killed over one hundred of his classmates, the practice was discontinued and he would thereafter be known as the "Demon of the Hidden Mist". His fame grew over the years as he became an ANBU, killing the Konohagakure ninja Kumade Toriichi at that time, before finally joining the Seven Swordsmen. At some point, he discovered Haku, a child with a special kekkei genkai and began training him to be the ultimate weapon. In time, after his assassination attempt on the Mizukage in a coup d'etat failed, Zabuza subsequently fled with Haku and some other followers, such as the Demon Brothers. In the anime, witnessed the Kaguya clan attacking Kirigakure yet choosing not to help his village. Soon after, he and Haku ran into Kimimaro, the soon-to-be-sole survivor of the Kaguya. Although Haku wanted to talk to the boy, Zabuza forced him to leave Kimimaro alone and keep moving.

Personality

Zabuza was initially portrayed as aggressive, arrogant, cruel, cold and ambitious, willing to become Gatō's thug to gain enough funds to start a second coup d'etat on the Mizukage, and kill anyone who stood in his path, including plotting to kill Gatō once he had received enough funds from him. His reputation for cruelty and ruthlessness began as a child where he killed every single candidate in Kirigakure's Academy, earning him the moniker of "Demon of the Hidden Mist" (霧隠れの鬼人, Kirigakure no Kijin). He willingly uses his own men and others as pawns to fulfil his ambitions, as he raised Haku to be an efficient tool to be discarded when he had no use to exploit; although unlike future antagonists, he was blunt about the purpose that his recruits were needed for, lacking the manipulation of pretending to be benevolent to inspire loyalty.
He is an observant adversary who is able to analyse his opponent's techniques after seeing it once, but becomes overconfident if he sees the technique as useless. In his last moments, it is revealed that he cared deeply for Haku, and after being convinced by Naruto Uzumaki, he sacrifices his life to kill Gatō, and dies wishing he could join Haku in the afterlife. However, he seems reluctant to speak or hear about it, telling whoever does so to shut up. Kakashi has also noted that Zabuza had hesitated for a moment before the thought of slashing through Haku to get to Kakashi during their battle on the bridge; the lack of hesitation during the Fourth Shinobi War made Kakashi know that the controlled Zabuza was completely different.
He has also shown a sense of honour, as seen after his reincarnation when he expressed disgust about the idea of working for anyone who would stoop down so low as to use the dead as their tools, in the meantime making the revived immortal. His sense of honour is extended even further when he pleads with Kakashi to stop him and Haku from causing damage.

Appearance

	An unmasked Zabuza with Haku.

Zabuza was a tall and noticeably muscular man with pale skin, short spiky black hair, brown eyes, and small eyebrows. He was normally seen wearing bandages like a mask over the bottom half of his face. Under his mask, he had a relatively narrow jawline and jagged-teeth, a trait he shared with his fellow Swordsmen. He wore his forehead protector sideways on his head, and prior to his defection from Kirigakure, donned the village's standard uniform and flak jacket. After his defection, and during his first appearance, he was seen shirtless, with his chest only covered by a belt to which he attached his Kubikiribōchō, wearing baggy pants with the striped pattern typical of Kirigakure and mimetic wrist-warmers extending up to his elbows, with matching leg-warmers.
During his second appearance, he wore a sleeveless black shirt and matching pants, complete with a waist-guard, and yet again, Kirigakure's striped wrist and leg-warmers. Other swordsmen of his generation wore attire identical to this, implying that they might be clothes related to the group. While donning this attire, much like his fellow Swordsmen, he had bandages loosely tied around his neck like a scarf.

Abilities

Zabuza's demon shroud.

As an ANBU, Zabuza was a powerful ninja. A very vicious fighter, his talent for combat was seen even as a child, who had yet to begin in the Academy, killed over a 100 trained students single-handedly. As an adult, without the aid of his arms and only a kunai in his mouth, Zabuza was able to strike down dozens of Gatō's specially hired men. True to his moniker, Zabuza possessed an incredibly strong chakra, which could be visibly seen when released, taking the image of a demon. Even while gravely injured, a single glare from Zabuza left the remainder of Gatō's thugs stiff in fear.
While he preferred using direct attacks, Zabuza was also highly capable at misdirections and was also a master of stealth and assassination. He had extensive knowledge of the human body's pressure points and most vulnerable organs. He was most renowned throughout all countries for his high skill in killing opponents through zero visibility. Kakashi noted his Silent Killing prowess was second to none. This technique puts the victim under tremendous pressure before Zabuza even attacks, as it is noted that even the slightest movement of the eye can alert Zabuza of his victim's location.
Befitting his ANBU status, Zabuza was also knowledgeable in foreign techniques and kekkei genkai, having knowledge of the Sharingan and instantly recognising the Shadow Clone Technique. Zabuza was also implied to be good at teaching, as it was under his tutelage that Haku managed to become such a powerful shinobi despite his young age.

Physical Prowess

He was strong enough to effortlessly wield the large Kubikiribōchō for long periods of time, even with one hand, as well as fast enough to match Kakashi in both movements and hand seals. His strength and agility was further proven when he held up Kakashi with one hand and a fūma shuriken in the other and was able to jump high enough to dodge a second shuriken, which was at the level of his neck while the Kubikiribōchō was still strapped to his back. Zabuza also had remarkable levels of stamina and endurance; after fighting Kakashi and having both of his arms injured beyond use, he charged against Gatō's thugs, killing many of them and Gatō as well, despite having a large number of blades piercing him from the enemies. Another example of his endurance was seen when Zabuza took a direct hit from a high level technique and being slammed into a treetrunk seemingly without taking damage and being capable of moving relatively normally shortly afterwards.

Ninjutsu

Kenjutsu

Zabuza with his Kubikiribōchō.

During his time as a Kirigakure-nin, Zabuza was one of the Seven Swordsmen of the Mist, a group composed of the village's top swordsmen. The generation of swordsmen he belonged to was noted as the strongest ever produced within Kirigakure, a further testament to Zabuza's impressive skills. Zabuza's signature weapon was the Kubikiribōchō, an over-sized broad sword, whose shape was thought to decapitate enemies. This large weapon has the unique ability to absorb and utilise the iron from all the blood it sheds, from whoever it cuts, in order to reform itself if damaged or broken. Zabuza was a master in its use, being capable of dispatching numerous enemies with a few slashes, and claiming that his sword "never cut a second time", implying to have killed a large number of people with a single attack.
The weapon's weight didn't seem to slow Zabuza down at all, as he could employ it in combat for extended periods of time with no visible strain on himself, something Suigetsu Hōzuki hasn't achieved. Apart from handling it very skilfully, Zabuza could also throw it spinning at several enemies with enough power to lodge itself into a hard tree trunk.
He also wielded a kunai with a sharp protrusion on one side (which in the anime is Kirigakure's variation of the standard kunai), designed for thrusting and stabbing instead of slicing, which fit his stealthy attributes perfectly.

Nature Transformation

Zabuza and Kakashi using the Water Release: Water Dragon Bullet Technique.

Zabuza had great skill in Water Release techniques. He could perform several of them while keeping a separate one active, as seen when he kept Kakashi trapped in the Water Prison Technique while at the same time attacking the rest of Team 7 with a water clone; he could maintain several of these clones at the same time, often using them as diversions. He also showed proficiency in large-scale, highly destructive water-attacks from launching powerful torrents of water in the forms of dragon missiles and giant waterfalls at his opponents.
Zabuza was especially adept at the Hiding in Mist Technique, as it made his Silent Killing even easier to perform. By blanketing the area in a thick mist, Zabuza could blind his targets, making it even more difficult for them to defend against him. Though he would be blinded too, Zabuza could strike his opponents without the need of sight, instead focusing on any slight sounds made by the opponents. In this manner, Zabuza was capable of carrying out stealthy attacks even in completely open spaces, able to suddenly disappear from an enemy's sight and then strike unseen. His skill with this technique was such that he could create an impenetrable mist without the need of an immediate source of water nearby. Even Kabuto Yakushi kept Zabuza's use of the technique in high regard, as seen when he was willing to sacrifice other reincarnated shinobi to protect Zabuza and keep the Hiding in Mist Technique going.

Stats

Databook	Ninjutsu	Taijutsu	Genjutsu	Intelligence	Strength	Speed	Stamina	Hand seals	Total
First	4.5	4.5	2.5	3	4	4	4	4	30.5