Nagu (ナグ, Nagu) is the twin brother of Naru.
Nagu was a silent and loner child and highly indifferent to other people in generally. He's protective over his sister who he only concern about and open up to.
Nagu and Naru were left alone to search for their parents right after their parents left them. Nagu and Naru became weak and before Nagu found a shelter, Naru died of starvation leaving Nagu alone on the island. He wished for another chance to protect Naru, and so he become a Shou and create a second Naru from Hakua's Kamui. He also drew children for Naru to make friends with after. Nagu tried to drew adults, however the adults he drew were failure and decided to find real adults in the outside island.
Hakua (白堊, Hakua)