Yakumo Kurama

is the last surviving member of the main branch of the Kurama clan, and, as such, the heiress to the clan.

Background
Born with a weak body, she was unable to perform the physical activities required of a ninja. Worried about this development, her father petitioned the Third Hokage to grant Yakumo a special tutor to allow her to become a proper ninja. This tutor was Kurenai Yūhi, who was a genjutsu user like Yakumo. Inspired by the example of Rock Lee, who was unable to use ninjutsu or genjutsu, and his relationship with his sensei Might Guy, Yakumo believed she could become a ninja through simply concentrating upon her genjutsu skills.

But Kurenai lacked Guy's optimism and felt that she was unable to train Yakumo in this regard. She eventually refused to train Yakumo, instructing her to seek another path in life. But Yakumo's refusal forced Kurenai to later seal up the young girl's powers. This was done on the order of the Third Hokage, as he had been made aware of the, a sentient and malicious personality within Yakumo's mind, which had been generated from the id part of her psyche. This personality could control her and use her incredible powers for destructive means - with the destruction of Konohagakure foremost in its mind. However, the monster overcame the seal, and cast the illusion of a fire engulfing the Kurama clan's household, which killed Yakumo's parents. Yakumo, however, believed that the fire was started on the order of the Third Hokage, having overheard a conversation that she believed indicated that the Third Hokage was planning to kill her if she became too much of a threat.

Abilities
She inherited the clan's kekkei genkai in its entirety. Her talent in genjutsu is completely irresistible, so much so that only knocking a person out cold has any chance of awakening them from it. Furthermore, the genjutsu is so powerful that it literally convinces the brain to copy anything that happens to the victim within the genjutsu, making it possible for her to kill her opponents with genjutsu. She often uses paintings as a conduit to cast these illusions, causing reality to reflect what is on the painting.

Kurama Clan Arc
Seeking revenge on Konohagakure, and specifically Kurenai, Yakumo escaped from her mountainside manor, which was under constant surveillance by ANBU and medics. She traveled to Konohagakure, and painted a picture of lightning hitting the Ninja Academy. As the lighting struck and the building began to burn, she packed up her supplies and left. However, she didn't get very far before a squad of medical ninjas and an ANBU intercepted her, knocking her out with a sleep-inducing drug. Naruto Uzumaki, who had been following her after seeing her painting, was warned to stay out of their way before they returned to the manor. A few days later, a group of her clan members, led by her uncle, Unkai Kurama, attacked the manor. Kurenai trapped the clan members in a genjutsu until faced by Unkai. While Kurenai was fighting Unkai, Might Guy came to the spot with the Team 8 members, Sakura Haruno and Naruto. With the assistance of Hinata Hyūga's Byakugan, Naruto managed to defeat Unkai. He swore to get Yakumo back as he fled away. Later, she put the whole of Konoha into a powerful genjutsu that seemed very much like reality, but was soon discovered. She captured Naruto and the others with the genjutsu but at the end only kept Kurenai. When Naruto came into her genjutsu again and told her what Kurenai had been keeping to herself Yakumo remembered what exactly happened, that she had killed her parents. Yakumo tried to kill herself but was stopped by Ido. She overcomes Ido with the help of Kurenai and realizes that Kurenai cared about her.