Abumi, Zaku

ザク・アブミ

Zaku Abumi was a Genin-level ninja from Otogakure. He belonged to the team that entered the Chunin exam with the goal of assassinating Sasuke Uchiha. Like many Sound ninja, he underwent physical alterations with unnatural enhancements to boost his abilities; specifically, he was fitted with hollow air tubes running through his arms and opening at his hands, enabling him to propel a mix of air pressure and sound in various ratios, controlled by his chakra. Unlike his partners, a glimpse into his past and how Orochimaru recruited him was provided, making him a far more dramatic character. The anime depicts him as an orphan living on the streets who survived by stealing and was almost always beaten for it. Orochimaru told him he had potential and liked the strength in his eyes. He refuses to give up, even at the cost of his own life.
After saving his partner Dosu from Rock Lee's lotus attack, he brutally fought off Sakura, who attempted to stop him from killing Sasuke. 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 Kekai 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 him, preventing him from doing any damage in the future (In the manga, his right arm was blown off due to the kikai bugs Shino used to fill up Zaku's air tubes, and the left was kept intact but halfway sliced. In the anime both of his arms are left intact, but have numerous holes in them, achieving the same, albeit less gruesome, result). Dosu says he would avenge him (or rather, his severed arms), but failed to do so.
Zaku, along with Kin Tsuchi, is later murdered as a sacrifice for Orochimaru's Impure World Resurrection for the First and Second Hokages against the Third Hokage.