Oboro

is a Genin from Amegakure

Chunin Exam arc
Soon after the second phase of the Chunin Exams begins, Oboro poses as Naruto to surprise Sasuke and Sakura. Sasuke sees through the transformation quickly as Oboro failed to copy Naruto exactly (he failed to copy the wound that Anko Mitarashi had earlier given Naruto). Exposed, Sasuke and Oboro fight. Using his Sharingan Sasuke manages to get the upper hand and injure Oboro, forcing him to retreat.

Later, Oboro and his teammates use a number different genjutsu to cause Naruto, Sasuke, Sakura, and Kabuto to waste time and tire themselves out. After having them fight illusions for a while, Oboro and his teammates engage them. They quickly find out that what appeared to be the Konoha ninja were really just shadow clones in disguise, the real ninja having been resting. Oboro and his teammates are quickly defeated and do not pass the second phase.

Land of Tea arc
In the anime, Oboro and his teammates, under the leadership of Aoi Rokusho, are assigned by Amegakure to help the Wagarashi clan win the Todoroki shrine race held in the Land of Tea. While Kagari and Mubi prepare for naval combat, Oboro went to stall Idate. After sinking Idate's ship, the Rain Genin went to battle Team 7 underwater, where they held the advantage. However, Naruto used his Rasengan training to hand them another humiliating defeat as the Rasengan created a whirlpool that sucked Oboro's team into a trench. They are assumed to have survived because of their masks.

Video games
In the Naruto: Clash of Ninja video games there is an "Oboro Mode" where the player fights an endless wave of Oboro copies. Every once in a while he says "Lucky".