Nikki is one of the main characters of Need for Speed: Carbon. Prior to the events of Carbon's plot, she was the player's girlfriend.
Nikki was holding onto the prize money in a bag for a race that the player was taking part in against Angie, Wolf and Kenji. Nikki was waiting in the middle of a crowd at the finish line. Before the racers arrived at the finish, the Palmont Police Department ambushed the race.
The crowd dispersed with the sudden turn of events, with Nikki getting knocked down by an unknown person, who switched her bag with an identical one.
The player drove through the crowd in an attempt to rescue Nikki. She was captured by the police, yet managed to throw the prize money bag into the vehicle. The bag is later revealed to contain newspaper scraps instead of the cash reward.
At the beginning of the career mode, when the player unsuccessfully fled from Cross and was helped out by Darius, Nikki attempts to attack the player but is hindered by Darius. He asks her to help the player to take over the perimeter of Palmont City. Subsequently, she teaches them about different crew member skills with Neville.
Later on, she learned that Darius was responsible for tipping off the police, switching the bags and ultimately ruining the reputation of the player. Nikki joins the player's crew to exact revenge on Darius and defeat his crew - Stacked Deck.