Nina Williams (Japanese: ニーナ・ウィリアムズ Hepburn: Nīna Wiriamuzu?) is a fictional character from Namco‘s Tekken fighting game series. A cold-blooded Irish professional assassin, Nina made her first appearance in Tekken, the original game in the series, and is one of four playable characters (the others being Yoshimitsu, Paul Phoenix and Heihachi Mishima), and the only female character to appear in all main installments in the series. She also starred in her own spin-off game, Death by Degrees.
Nina has an unstable and often violent relationship with her younger sister, Anna Williams, who is frequently her arch-rival in the series. She is known for her fast and lethal fighting style, based loosely on the fighting arts hapkido and koppojutsu, among others. The character was mostly very well received, often regarded as one of the best Tekken characters as well as one of the most attractive and stylish female characters in gaming.