Kakō

is an artificial human, hailing from Iwagakure.

Background
After Iwagakure was attacked by missing-nin, which resulted in multiple young casualties, Ōnoki was especially hurt by this loss as one of the victims was his grandson Kozuchi. Determined to find a means to protect the peace and keep all innocents alive, the retired Tsuchikage began working on creating the Akuta as replacement soldiers. As research was going slowly, Ōnoki was approached by a scientist with a genetic sample from a White Zetsu. Using this new material, despite the cloning techniques still being in its infancy, Ōnoki was able to not only refine his Akuta, but also produce five self-aware and independently thinking artificial humans, one of which was Kakō.

Personality
Kakō is shown to be a very irritable and impatient man, enjoying constant excitement from battle and the likes. Similar to his fellow artificial humans, he is fascinated by the nature of human interaction and enjoys reading about it.

Appearance
Kakō has red hair and grey eyes. He wears a purple tunic over a sleeveless black body suit. Like his comrades, his hands and face are covered with bandages.

Mitsuki's Disappearance Arc
Kakō went to see their leader, Kū, with Kirara, who returned to give their leader her report. He even asked Kirara if she made a mistake during her mission and blames her while talking about Kokuyō and Sekiei being late, much to her irritation. Kakō said there was no need to make excuses to him and stated their leader would pass judgement.

When his leader Kū began his power move against the Fourth Tsuchikage, Kakō aided him in capturing the village leader. After the successful abduction, Kokuyō return seeking help for the weakening Sekiei. Kakō and Kirara joined him to help. Midway, they found Mitsuki approaching them while carrying Sekiei. While Kirara and the others grew suspicious of Mitsuki, Sekiei vouched for Mitsuki, insisting that the young boy truly came of his own free will to learn who he really is.

Once arriving at their headquarter, he discussed with Kokuyō how best to deal with Mitsuki, as the plan ultimately was to dissect him. Kokuyō however calmly said they would wait for orders. After Ōnoki went missing, Kū had Kakō and Kokuyō use more Akuta to search for the elderly man. Later, his body began breaking down, requiring treatment. When Kirara's body began weakening, it caused her genjutsu on the village officials to end. Realising that they had to take drastic measure to keep their work secret from the outside world, Kū launched a hostile takeover. Once succeeding, the artificial humans began growing irritable at Kū's refusal to try a human heart transplant on them, which could likely save their lives, on the grounds that they did not yet have Ōnoki's permission. He later found Ōnoki and Boruto.