Fū (フー, Fū; Viz "Foo") was a shinobi from Konohagakure's Yamanaka clan as well as a high-ranking ninja of the disbanded ANBU faction: Root.
Like all other members of the ANBU faction, Root, Fū lacks a personality due to the gruesome training regime Danzō had them undergo at a young age. As such, he acts merely as a tool that carries out Danzō's orders. The only discernible trait that he and the other members have shown is fierce loyalty towards Danzō.
Character is error.