Kidomaru (鬼童丸, Kidōmaru) was a shinobi from Otogakure and a member of the Sound Four.

In the anime, the Sound Four were originally prisoners of Orochimaru, forced to fight other prisoners to the death in battle royales. By surviving their respective matches, they proved themselves to be the strongest of Orochimaru’s prisoners and as such were made his bodyguards. The Sound Four were at some point forced to accept Kimimaro as their leader, who easily defeated them all in battle and, because of his Shikotsumyaku abilities, was slated to be Orochimaru’s next host body. Under Kimimaro their group was known as the Sound Five (音隠れの忍五人衆, Otogakure no Shinobi Gonin Shū, literally meaning: Hidden Sound Shinobi Five People).

In the anime, the Sound Five assisted Orochimaru with assassinating the Fourth Kazekage and killing Shiore’s team during the Chūnin Exams in Konohagakure. Kimimaro fell terminally ill after this, forcing him to withdraw from the group; he became ill at some unspecified time in the manga.