"Nina Williams (Japanese: ニーナ・ウィリアムス; Niina Wiriamusu) is a character from Namco's Tekken game series. She is known to be a cold-blooded assassin who had made her very first appearance in the original Tekken game and since has appeared in every Tekken game released. She is one of only four Tekken characters to appear in each game along with Yoshimitsu, Paul Phoenix and Heihachi Mishima and the only female character to have appeared in every installment. She is known to have an unstable relationship with her younger sister, Anna Williams.
Nina Williams is known for her lethal fighting styles, consisting of many martial arts and fighting skills. Due to the success of the character, Nina Williams starred in her own spin-off game, Death by Degrees."
Source: Wikipedia, "Nina_Williams", available under the CC-BY-SA License.