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 two playable characters (Paul Phoenix) 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 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 Jujutsu 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. Appearances In video games Nina Williams is the first-born daughter of an Irish father, former assassin Richard Williams, and a British mother in Ireland, Heather Williams, as was her sister, Anna. From a young age, both Nina, and Anna, were taught various forms of martial arts such as assassination martial arts, Jujutsu and koppojutsu. Both sisters admired their father, which spawned a sibling rivalry between the two as they craved and competed for his attention. When Richard died, both sisters blamed each other as the cause of his death. Although they tried to maintain their relationship following their father's last wish, it only made their rivalry strengthen even further. Nina's training in the assassination martial arts helped her to quickly become an assassin for-hire. The 20-year-old Nina had later been hired during The King of Iron Fist Tournament to assassinate the head of Mishima Zaibatsu, Heihachi Mishima. However, she failed when she was defeated by Kazuya Mishima. Two years later, Nina was contracted again to assassinate the current head of Mishima Zaibatsu, Kazuya Mishima, by entering The King of Iron Fist Tournament 2, but Anna intervened and was defeated by her, as a result a conflict prevented her from fulfilling the assignment. Nina was captured by Kazuya after failing to assassinate him and was used as a test subject in the "cold sleep" project by Dr. Boskonovitch - a cryogenic experiment. Anna Williams volunteered to be put in cryogenic sleep, but demanded to be awoken at the same time as Nina. The experiment went on for 19 years. When Nina woke up from