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. in the series. Notably, Nina is one of the three playable characters (the other two being Paul Phoenix and Yoshimitsu) and the sole 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 a summer version named Summer Nina who's introduced in Tekken Mobile. Summer Nina has the same fighting style and the same Rage Art like Nina. 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 Aikido, Hapkido and Koppojutsu, among others. Nina was mostly very well received, often regarded as one of the best Tekken characters and is perhaps the most famous female fighter in the Tekken series.