Zero-Tails (Exiled)

The is a Noh masked leech-like spirit sealed within Soru Kurama.

Background
The Zero-Tails is an evil spirit created by the dark thoughts and feelings of the downtrodden people. This parasitic creature will seek out and feed upon any negative emotions within one's heart and allows the spirit to create. When anyone near the Zero-Tails is emotionally unstable, it will inhabit their body and take them over. This process is similar to a jinchūriki using the power of its Tailed Beast, but it does not require a human sacrifice, nor does its extraction kill the host.

===Dark without Light:A Kurama's Destiny The Zero Tails found home recently within Soru's subconscious. Tamed and controlled by Boido.

Abilities
It has the ability to fire tendrils from its body and to also form them into hands. It seems to also be able to regenerate. It also has a very large mouth that appears under its mask. Large molars grow from inside its mouth and it seemed to have tried to bite Yuna Hime when she attacked it. It appears to have the ability to read the hearts of others, going as far as sensing negative emotions around it.

The Dark Chakra produced by the Leech is derived from the darkness within the hearts of the people around it, and it grants the user of this chakra a great source of power, giving access to high-level techniques without even using hand seals while negating any potential drawbacks those techniques may otherwise bring, as well as powering up the entire Ancor Vantian floating fortress.

Trivia

 * Despite the beast referring to itself as Zero-Tails and Shinnō referring to it as a tailed beast, it is not really one of the original tailed beasts due to the fact that it was not born from the Ten-Tails.It's also noteworthy to comment that, during the movie, when the Zero-Tails latched onto Naruto, the Nine-Tailed Demon Fox reacted aggressively to its presence and attempted to expel it.
 * Copied from Kaze's