Another idea, part of the vote as well... A Girl or boy, given the other half of Kurama because Kushina didn't want Naruto alone... Daughter of Criminals she has a high amount of chakra so she can handle Kurama's essence better then most...she comes to loathe Naruto, believing him weak for becoming the villages bitch... her path would be very different since she never grew up with naruto... She is hated for her parents by the public but by the Ninjas it is due to her being the other host for Kurama...
Fire and Water type- Extreme personality, hates authority and has a very cruel but honest way of seeing the world. Graduates with Lee's class. Lives on the other side of the village, away from Naruto. Super clean apartment, no decorations, no attachments...
Probably trained by Raido to become a new Gaurd to the Hokage, something to give her attachments... this works the otherway though... she acts as a back up, to put Naruto down but because she is not Uzumaki or any special bloodline the Power is killing her... she hates being disposable and that drives her to want to live, to do anything to survive...