Isaribi

Isaribi's eyes are black and pupilless, and her hair falls in a shade of purple. Bandages wind across her face, arms, and legs to conceal the scales left on her skin, worn above brown shorts and a sleeveless tunic-blouse; a plain yellow sash circles her waist as well. Once she shifts into her altered shape, her skin turns green and she takes the form of a fish-like humanoid.

The cruelty of her past left Isaribi timid and guarded, yet also curt and jaded, and the loathing aimed at her kept her closed off from those around her. Naruto felt the two of them were almost identical, each scarred by being pushed away. So desperate was she to be ordinary again that she would carry out anything demanded of her, though kindness never left her and she would still lend a hand to anyone struggling. Seeing Naruto endure the same isolation and yet make friends and reach out to her, she came to welcome his companionship and grew more hopeful.

Among the earliest and unfinished results of a project meant to grant shinobi underwater breathing and movement, Isaribi was returned by Amachi to her coastal homeland and told to keep watch over vessels heading out of port. Her wrapped body made the villagers fear her, and they struck at her and wrecked her belongings, since she alone had ever come back after being spirited away. The Kaima Form that Amachi's work gave her let her breathe below the waves, move with added speed, call on Water Release, and grow scales tough enough to stop a blade.

Told she would be made human again if she cooperated, she raided ships and slew sailors while wearing the guise of the sea monster known as the Kaima. After hauling a drowning Naruto from the water and tending him, she still turned down his appeals to quit, sure he could never understand her pain. It was only mid-battle, on learning that Naruto carried Kurama and had suffered as she had, that she walked away from Amachi. He then confessed no cure had ever existed and that he intended to dissect her once she stopped being useful. She travelled back to Konoha alongside Naruto, hopeful that Tsunade might reverse what had been done to her.