Kanna

Kanna (神無, "God of Nothingness") was the first incarnation of Naraku created only to destroy Tessaiga. 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 such as the Hakurei-zan barrier. 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. She was created from Naraku after he had gathered enough Jewel Shards to make him strong enough to make incarnations.Kanna originally had barely any sense of self, doing as Naraku ordered of her. She knew Naraku could kill her and Kagura at any time he wished; "It's in Naraku's hands, both life and death." As she harbored no ill will towards her creator, she was trusted above all her siblings, being allowed to give Kagura and Kohaku orders from him. Despite Naraku believing she wouldn't develop a will or emotions of her own, Kanna eventually did and began to question her own existence. Her bond with Kagura was the only reason Kanna betrayed Naraku; letting Kagome know the light in the Shikon Jewel could kill him was Kanna's way of avenging Kagura. She appeared to have an ear for poetry, reciting some of the poems in InuYasha the Movie: The Castle Beyond the Looking Glass. In InuYasha: The Final Act, Kanna recites the same poem twice in "Naraku's Heart" and another one in "Flowers Drenched in Sadness". Each poem reflected something from each episode, such as Kagura's desire for freedom and questioning her own existence.