Kidomaru was one of Orochimaru 's handpicked Sound Four bodyguards, whose former leader was Kimimaro. Later, they were defeated by Kimimaro , who forced them to accept him as their leader. Kidomaru made his debut in the series at the Chunnin Exams finals battle arena, alongside his fellow Sound Four members erecting a barrier for his master, Orochimaru , to fight the Third Hokage, Hiruzen Sarutobi within. After Anbu arrived as backup, the Sound Four erect a barrier on the inside to protect themselves from Hiruzen. After Orochimaru's arms were crippled, by his order, Kidomaru and his teammates undid their barriers and carried him away after the mission to destroy Konohagakure failed.
He is a member of the Sound Four and is the smartest and third-strongest member of the group. He was also indirectly responsible of leading the Third Hokage's death. He could use his webbing to bind, trap and detect his group's enemies.
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. Kimimaro fell terminally ill after this, forcing him to withdraw from the group; he became ill at some unspecified time in the manga. Like the other members of the Sound Four, he is extremely arrogant with his opponents, though he was not as arrogant as the others, believing they could not defeat Kakashi.
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