Jirobo (次郎坊, Jirōbō) is the physically strongest member of the Sound Four, albeit the least powerful, according to the other members. His strength is such that, through simple physical attacks, Jirobo can defeat an opponent in one or two blows. He is even capable of lifting boulder-sized rocks with ease and hurling them across long distances. Jirobo is noticeably fat, though takes offense to this when Tayuya calls him as such and always scolds her for it. Because he is able to absorb the chakra of others, Jirobo often captures opponents so that he can absorb their chakra as a form of sustenance.

Jirobo is drawn into battle with Choji Akimichi during the Sasuke Retrieval arc, who he calls fat near-constantly during their battle. This, as well as Jirobo's insults of Shikamaru Nara, causes Choji to utilize his trump card, drastically increasing his strength. Despite Jirobo's best attempts, Choji's strength outmatches his own and he is killed with a blow to the chest.