Nue

Overview
Nue is a yōkai that was created by Root. It is the result of Project Gozu Tennō, designed to be the ultimate weapon harvested from Yorichi Uzumaki's cells. As Stephanie continued her amoral methods to protect Noharagakure, upon realising the potential power within the First Firudokage's very cells, she harvested some of them. Placing one of her top researchers and most loyal followers on the project, the goal was to create an ultimate weapon. While seemingly a rampaging beast drawn to people of negative emotions, Nue is in fact extremely loyal to its summoner. Despite the dark nature of its creation, it is filled with love towards its summoner, having come to view them as its parent after spending years being nurtured by them. It was even willing to sacrifice itself to ensure their survival. While in its diminutive form, it likes to remain perched on their shoulder. Normally, it appears as a shapeless dark purple mass. While absorbing enough chakra, Nue takes a tangible form that is reminiscent of a chimera: it is large and has a monkey's head with large fangs and a white mane, a tanuki's body, a tiger's legs, a white snake for a tail and glowing yellow eyes.

Abilities
Nue is able to sense the negative emotions in an individual, using that to select its target. Once it possesses someone, it preys on their emotions, making them give in to their darkest impulse leaving the victims themselves unaware. Only when the victim overcomes their negative emotions or is knocked out will the specter be forced out from its vessel. It also appears able to feed off their victim's chakra as sustenance, using it to take a physical form to attack independently. In its fully tangible state, Nue is shown a unique form of regeneration, able to grow several smaller versions of the limb from the stump. It is very strong, able to smash through multiple giant stone walls and highly resilient as launched kunai merely bounce off it. Its endgame ability is to use the collected chakra to self-destruct in a powerful explosion. It is also able to use Space–Time Ninjutsu to teleport, escaping giant barriers. It can also manifest its chakra as tangible constructs. After Nue's form was reduced to a chibi-level, its abilities were also apparently equally reduced in might.