Zaku Abumi

Zaku Abumi is a former Sound ninja who now trains under Kisame of the Akatsuki.

Meeting Orochimaru
Zaku was an orphan who lived in the slums of a small town in the Rice Field country. He lived as a street rat, finding food and supplies anywhere and taking it. He was often beaten for his pluck got him caught often. One day, he encountered Orochimaru. The snake sannin sensed much potential in Zaku, and brought him to Otogakure. Along with Kin Tsuchi, another orphan, and Dosu, a genius child inventor who ran away from his family, he was entered into the Chunin Exams.

Chunin Exams
After saving Dosu from Rock Lee's Front Lotus, he fought off Sakura Haruno who attempted to prevent him from killing Sasuke Uchiha. After the helpless Sakura lay beaten on the ground, he and his team had to fight Team Asuma. During the fight, Sasuke finally regained consciousness, and asked Sakura who had injured her. Zaku took the credit, and Sasuke proceeded to dislocate and greatly injure Zaku's shoulders. He was the only Sound ninja to fight Sasuke, as the others retreated. During his fight with Shino Aburame in the preliminary exams, he overcame the injuries to his shoulders and was able to use his arms to defend himself against Shino. Due to his cockiness, he attempted to attack both Shino and his approaching army of kikai insects, not noticing that the chakra-eating bugs had already filled the tubes in his arms, preventing him from attacking and even more brutally crippling and preventing him from doing any damage in the future. This resulted in one of his arms becoming severed from his body. When the Sound and Sand forces raided Konoha, Orochimaru used Kin and Zaku as sacrifices to summon the First and Second Hokage from beyond the grave. this resulted in Kin's and Zaku's deaths.

Squad Kisame Formation
Both Kin and himself were revived by Kisame Hoshigaki inserting a Samehada Shard into their shoulders. This also caused his right arm to regenerate. The two spent 2 years training under Kisame, and eventually went to Konoha as part of Squad Kisame, and were joined by Kisame's reluctant apprentice Suigetsu. During a fight with the Anaconda Trio, The shard awakened, and instilled new power into Zaku. However, it wasn't enough to defeat Tora Kage. Zaku put forth a valiant effort, though, and there were no casualties. Some time later, Zaku and Kin went on a date, during which their true feelings for each other emerged.

Kirigakure Plot and Rescue Omori
Zaku learned, two days later, about Suigetsu's departure, and he and Kin left to go after him. Unfortunately, despite a helpful lead from Kizuna, they were unable to even find Suigetsu. Upon their return, Zaku learned about Kirigakure's plans from Kizuna. Said plans ended up with Ryuumi becoming the Mizukage, and Kin unlocking her third stage of Samehade transformation. Afterwards, the group headed to go save Omori, the son of Zabuza, who was captured by Otogakure ninja, while Kisame went to attend to Akatsuki business.

Omori was found in Otogakure being assisted by a Sound ninja. It seemed as if Omori did not wish to return to Kirigakure, so Squad Kisame fought him. Omori was eventually killed at Kin's hands. Zaku and Kin ran into Tora and his comrade, Yoruichi, outside of Oto. Zaku and Tora brought each other to their absolute limits, including Zaku getting his own 3rd stage, and the battle ended in a draw- but not before Zaku gained a new weapon and learned, then revealed, the true name of the tiger Shadow: Seijun Togiretogire. When Zaku came to, he and Kin found a boy that seemed to be a perfect clone of Orochimaru, named Onichi. They took them back with them to Kirigakure.

Rescue Onichi
No sooner than the squad returned from Otogakure, than Sasuke effectively blew up part of Kizuna's house. This led to Zaku meeting Seijun's sensei, Hiko Seijuro. Unfortunately, it also led to Kin's hosiptalization- something that Seijun took advantage of to capture Onichi under Orochimaru's orders. Kin's motherly side kicked in, and now Kin and Zaku, along with Seijuro and Kyteno, invaded Kiaigakure to save Onichi.

Seijun's Test
Zaku and Kin were too late in their mission, despite gaining the temporary assistance of a woman named Shinrai Okashira. Before the Otonin came and blitzed Zaku and Kin, they were saved and evacuated from Kiaigakure by their master's partner, Itachi Uchiha. It was revealed that Itachi had recruited Seijun, and by extension Yoruichi and Soifon, to the Akatsuki. Upon returning to Amegakure, Pain decided to test Seijun- by pitting him against not only Zaku and Kin, but his own apprentice- a revived Dosu Kinuta. The reunited Sound Trio proceeded to dominate Seijun, but Seijun's inner spirit named Tsukoyomi (not to be confused with the Sharingan technique Tsukoyomi) proceeded to lay waste to the weakened Trio. They did not die, but they were heavily wounded and gradually recovered.

Ninjutsu

 * Water Burst
 * Tidal Wave
 * Wind Style: Wind Blade
 * Wind Style: Water Blade
 * Spring Leap
 * Wind Style: Air Wall
 * Water Style: Water Wall
 * Paralysis Snipe
 * Wind Style: Healing Wind
 * Enhanced Hearing
 * Water Style: Water Prison Jutsu
 * Water Style: Water Clone Jutsu
 * Water Style: Hidden Mist Jutsu
 * Water Style: Great Exploding Current
 * Water Style: Water Limbs
 * Water Style: Samehada Telepathy
 * Summoning Jutsu: Umiray
 * Water Style: Hurricane Devastation
 * Wind Style: Hurricane Death Sentence
 * Wind Style: Healing Wind

Taijutsu

 * Air Cutter
 * Slicing Sound Wave
 * Whirlwind Thrust
 * Whirlpool Thrust
 * Sonic Blast
 * Spring Leap
 * Paralysis Snipe
 * Enhanced Hearing
 * Blinding Hallucination (with Kin)

Genjutsu

 * Blinding Hallucination (with Kin)