Nina Williams is an Irish professional assassin and a central figure in the anime film Tekken: Blood Vengeance. Trained from childhood in lethal martial arts such as aikido, koppojutsu, and hapkido, she was shaped by her father, a former assassin, and her mother, an aikido champion. This upbringing instilled in her a cold, indifferent demeanor and a ruthless efficiency in combat. Her lifelong rivalry with her younger sister, Anna Williams, is a defining aspect of her life, rooted in jealousy and competition for their father's approval. Within the narrative of Tekken: Blood Vengeance, which takes place between the fifth and sixth King of Iron Fist tournaments, Nina serves as the most trusted bodyguard and close ally of Jin Kazama. She commands the Mishima Zaibatsu's elite Tekken Force and is tasked with protecting Jin while carrying out missions on behalf of the organization. Her motivation is professional loyalty rather than personal ideology, though she also seeks to settle her ongoing conflict with Anna, who is aligned with opposing forces. Nina's fighting style is characterized by fast, brutal grappling techniques, chain throws, and counterattacks, augmented by her training in assassination arts and proficiency with firearms. She is known for her silent, calculated approach, rarely showing emotion beyond a sadistic satisfaction when antagonizing her sister. In the film, she serves as both an enforcer and a guardian, her role highlighting her complex position as a hired killer who has found a measure of purpose under Jin's command. While she does not undergo a significant personal transformation in the story, her interactions with Jin and Anna reinforce her established traits: cold professionalism, unwavering competence, and a deep-seated, volatile family bond.