Kanna

Kanna (神無かんな, "God of Nothingness") was the first incarnation of Naraku created with the only purpose of destroying Inuyasha's sword, the powerful 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 Mount Hakurei 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 Shikon Jewel shards to make him strong enough to make incarnations. She remained loyal until the very end and never even considered betraying Naraku. She killed herself following the orders of Naraku.