U

U (ユー, Yuu) is the codename for an elite shinobi from Kumogakure, and the long-time friend and partner of the famed, K. A former member of Team Omoi, he specialized in the style of bukijutsu, before discovering his true power. U possesses the Kekkei Genkai, Steel Release, and incorporates it well into his fighting style with weapons, with he himself, becoming a true weapon. A seasoned war veteran himself, U holds years of battle combat under his belt, and years of smithing.

Behind his Uchiha and Yotsuki partners in his early years, against all odds he became a chūnin, despite his defeats in the Exams. Doing so, boosted him to new heights as he begun training with the greatest weapon masters of Kumogakure. Following Kei's return and the unrest of the land, he would train alongside his friends for the War for Mamoru, sharpening his skills, literally, making various tools as a result.

Battling in the War, he would be given a leadership position of half of the First Division, along with his former teacher, and Karui. Fighting against the rebels, he and the two war heroes would fight to find the enemy base as quickly as possible, and end the war, under Darui and C's command. However, after the other half of his division, led by Yoru, Mamoru and Kei managed to get its location out of an enemy rebel, together they would charge on, and enraged by various deaths, such as C's and Yoru's, the Kumogakure ninjas would charge onto victory during the war, earning U much fame as a blacksmith and shinobi.

Watching over Island Kumogakure, U is a part of the Kinkaku Force, led by his former genin partner, Kei. Together, they have established the Force's reputation back to what it was many years ago, in only five years. Still blacksmithing to this day, U's creative tools and Kekkei Genkai make him a capable partner for Kei Yotsuki, and a great guard for the Raikage. One of the highest members of the Kinkaku Force, U shares his position with Enkyo, leading it in Kei's stead in light of his current situation.