Unkai Kurama

is Yakumo Kurama's uncle, and a member of the branch family of the Kurama clan.

Background
Overall, he cared about his clan above all other things, even Yakumo's life. After the death of Yakumo's parents, Unkai petitioned with fellow clan members to have Yakumo killed. The Third Hokage denied their requests, and it seems they have given up on them.

Abilities
He is a very strong genjutsu user, even capable of escaping Kurenai's genjutsu, though having to forfeit his battle with her and retreat.

Kurama Clan arc
Several years later, Unkai was set on stopping Yakumo once and for all since Yakumo's unconscious mind held a terrible beast which had killed her parents years earlier. Even though her powers were now sealed away, the beast would only grow over time and threaten the village. With the help of other members of the clan, they began to assault the compound to get to Yakumo. Kurenai Yuhi managed to arrive and spirit the young woman away. When Unkai confronted them, Naruto Uzumaki, Sakura Haruno, Hinata Hyūga, Shino Aburame, Kiba Inuzuka, and Might Guy confronted him and caused him to flee. The group was then trapped in Yakumo's genjutsu. He returned to explain to them Yakumo's dark history and helped them escape, suffering burns from Yakumo's powers. After helping Naruto out of the genjutsu which showed a fiery room by having them shut off their mind, Unkai ended up burned. Unkai remained behind to have his burns treated by Sakura and other medical-nin while Naruto and Kurenai confronted Yakumo and helped her come to terms with her powers and put an end to her deadly subconscious.