Nue

This mysterious spectre is a dark presence that is drawn to people with negative feelings.

Personality
As mysterious as where it came from, the spectre's intentions are equally unknown. Once consuming a person, it drives them to act upon their darkest impulses.

Appearance
The spectre has no solid or actual form, existing only as dark purple mist. Once possessing someone, their body is covered in a purple chakra cloak that only certain powers can perceive. Also, the person's shadow takes on a demonic shape representing the spectre. While using Boruto's chakra from a summoning, it took the form of a massive chimera creature that (only seen as a shadowy silhouette) has a bestial form with a tail like a serpent.

Abilities
Similar to Kurama, the spectre is able to sense the negative emotions in an individual, using that to select its target. Once possessing someone, its manipulations of their emotions, making them give in to their darkest impulse, are so subtle that the victim is not even aware of it themselves. Only when the victim overcomes their negative emotions or is knocked out will the spectre be forced out from its vessel. It also appears able to absorb one's chakra as sustenance, using it to take a physical form to attack independently.

Academy Arc
On the night before the Academy entrance ceremony, when Denki Kaminarimon was struggling with his strained relationship with his father and his constant bullying, the spectre possessed Denki. The following day, the possessed Denki lured his bullies onto a defective train, having set up another train to collide with it. Boruto Uzumaki, having saw the dark chakra emanating from Denki went to help. Making him realise that he can't harm other people to solve his problem, Denki snapped out of his possession, expelling the spectre from his body. Weeks later, when Metal Lee was growing ashamed at his social-anxiety getting in the way of his performance, the spectre possessed him. The following day, the possessed Metal attacked Boruto, Shikadai Nara, and Inojin Yamanaka as the ones who called him on his cowardice. With his possessed aggression, Metal quickly forced the other students to flee. Ultimately, Shikadai was able to subdue Metal with Shadow Imitation Technique. As Metal began to break free, he tripped and landed on his knocking himself out and rejecting the spectre. Later, when Boruto attempted to perform a Summoning Technique despite now blood contract, the spectre used the chakra to take a solid form. As it attacked the students, Konohamaru Sarutobi stopped it with his Rasengan, ultimately destroying its form before dispersing as a mass of purple light.

Later, the spectre possessed an expelled student from the Academy, latching itself to the boy's bitterness at failing to be a ninja. The possessed boy began causing mayhem in the village with his Fire Release. He was ultimately approached by Boruto again, along with Shikadai and Iwabee Yuino. The boy was forced to retreat, only to be defeated by Mitsuki, again forcing the spectre out. The following day, the spectre possessed a ninja working on repairs on the Academy, latching onto his frustration at the students making his work more difficult. As the ninja began causing more destruction to the Academy, the students worked together to stop him, ultimately subdued by Boruto and Mitsuki. Later that day, Shino Aburame, the class' teacher, was very distraught at both his inability to command respect from his students and feeling responsible for the further damage to the Academy. The spectre then possessed Shino, making him decide that the best way to deal with problem students is to get rid of them. The possessed Shino then sent a letter to Boruto, Mitsuki, and Shikadai to meet at a training field for extracurricular training. Once they all met up, Shino made his dark intentions known.