Muku

Muku had pale skin which contrasted with his jet-black hair and grey eyes. He wore a blue kimono shirt with the sleeves rolled up, a scarf around his neck and black arm-warmers. He also wore a pair of blue pants and sandals on his feet. After emerging from the Box of Ultimate Bliss, he was noticeably taller. His skin became extremely pale, his hair was longer and had dulled in colour and he was wearing the same clothes as he had when the box was open, which has since been in tatters.

When he was an infant, Muku lost his mother and was raised by his father, Mui, the guardian of the Box of Ultimate Bliss. He was regarded as a prodigy of his village and, therefore, his chakra was chosen to open the box in hopes of returning Kusagakure to its former glory. The day before it happened, Muku promised his best friend, Ryūzetsu, that he would return no matter what happened. Muku's chakra wasn't enough and he was sucked into the box instead where he spent ten years trapped in despair and grief, with all his attempts to break the box from the inside failed.