Abumi Zaku, part of a team with Dosu Kinuta and Kin Tsuchi, is an arrogant, proud genin who stubbornly refuses to give up, even at the cost of his arms. This Sound-nin had a difficult life as an orphan, and was beaten regularly for stealing food to survive. Orochimaru then took him in because he "liked" Zaku's angry, proud eyes.

 Zaku likely had special surgery in his arms, giving him the ability to use his Zankuuha, a powerful jet of air that can destroy rock and rip flesh. Although powerful, it has a glaring weakness, and that is that it is clogged easily, as Zaku found out during his fight with Aburame Shino.