kanna of the mirror
Kanna (神無, "God of Nothingness") was the first incarnation of Naraku. As a "concealed incarnation" of Naraku, Kanna had no scent and no demonic aura, making her undetectable to Inuyasha's senses and was also immune to demonic aura-related effects. Kanna was the only incarnation that Naraku trusted with important information about his actions, allowing her to give orders in his place. Even though she was a void, she still had her own emotion of sadness that she could not express.