Momochi Zabuza is originally from the Land of the Hidden Mist. Known as the Demon from the Hidden Mist. His ability excels in silent killing and stealth. He is a legend among ninjas and is greatly feared, hailing from the Hidden Mist Village (also known as Bloody Mist Village).
When he was a boy, he killed over 100 fellow students even though he wasn't a ninja (tradition was that the students must kill each other for the final exam). This caused great reform in the way that the students must pass and because of Zabuza, the tradition was broken. Zabuza
grew to become a extremely powerful shinobi and he even conspired to assassinate their Kage, but the coup d'etat failed and Zabuza went into hiding with the shinobi hunters hot on his trail. There he met a young boy laying on the street and he was going to originally kill him until he realized that this young boy reminded Zabuza of himself. This young boy's name is Haku who becomes Zabuza's right-hand man and tool. In order to further his ambitions, Zabuza takes a job by a corrupt businessman name Gato who wants Zabuza and Haku to eliminate a bridge builder name Tazuna who, in order to defend himself, has hired the help of Cell Team 7 from the Hidden Leaf Village: Naruto, Sasuke, Sakura, and their sensei Kakashi holds the Kekkei Genkai - a skill passed down fromt generation to generation, and Zabuza uses. The bridge that Tazuna is building will connect the Land of the Waves to the rest of the lands, and that's why Gato doesn't like that. In a final desperate fight, Zabuza fights against Kakashi and Haku fights against both Sasuke and Naruto. As the fight drags on, Kakashi decides to finish the fight and attempts a one-hit kill attack. Haku sensing his idol was in danger, quickly comes to Zabuza's aid and dies
saving his master. Zabuza seems to act cocky and emotionless even after Haku dies until Naruto talks some sense to him. Zabuza is then seen crying and then decides to get his revenge on Haku.
This is when Gato arrives and reveals he doesn't plan to pay him but plans to kill him. Thus Zabuza decides to not assassinate Tazuna and sets his sights on Gato and ends his fight with Kakashi. Zabuza goes to attack Gato and manages to kill him but not until he receives like 20 swords in his back. Zabuza then asks Kakashi to carry him over to Haku so he can see his face. It then starts to snow during summer, as if Haku is crying. So Zabuza dies right next to Haku. ---->Off of Absolute Anime
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Kisame
One of the members of the Akatsuki group, Kisame is a deadly terrorist trained for evil purposes. Partners with Itachi, he remains loyal as a teammate with him. Known as the Daimyo Killer, he was formerly a hidden mist shinobi. Water tribes were constantly searching for this shinobi after he terrorized them.
Enlisted with Itachi
as a S-Class criminal, Kisame is as deadly as any shinobi can get.
Armed with a gigantic broadsword covered with tape, Kisame can crush
anything. If his "Samehade" (sharkskin blade) is revealed when the tape
unfolds, it becomes an ultimate murder weapon.
His blade also sucks up chakra of people inches from it, though only when he swings it.
Kisame
is one of the seven shinobi-gatana of the mist. The ring that Hoshigaki
Kisame wears means 'south'. And according to Kisame, his blade, the
Samehade, "does not slice, it shaves".
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Demon Brothers
"Demon Brothers"
Chunnin level ninja, they are currently Missing Nin formerly of the Hidden Mist Village under the command of Zabuza Momochi another Missing-Nin from the same village, they contract out their ninja abilities to paying clients. Each wear a large, metal guantlet(with posionous claws) on opposite arms which are connected by a spiked chain that they
operate in cooperation. Surrounding their opponent with the chain, they
are able to constrict the chain to the point of severing their target
into two or several more pieces.