Kagewaki Hitomi (ひとみかげわき) was the only son of Nagasaki Hitomi, a daimyou. Naraku needed a temporary body to remain in the world, search for the Shikon shards and manipulate those around him. So, through an insidious plot, he took advantage of the young Kagewaki's position and killed him to assume his identity. Kagewaki's father was also possessed and then killed by Naraku while he was disguised as Kagewaki. Kagewaki's position also helped him with tricking Sango into believing that Inuyasha was responsible for the death of her clan. He used a Kugutsu to pose as his real identity while he was disguised as Kagewaki. Although Naraku changed bodies throughout the series, he kept Kagewaki's cool face, and voice in the anime. (Source: InuYasha Wiki)