Nina
In the last tournament she was ordered to assassinate
Kazuya, but an untimely quarrel with her sister Anna prevented
it. Shortly thereafter both sisters were captured by Kazuya's
corps and were used as guinea pigs in Boskonovitch's Cold
Sleep No. 2 experiment.
They did not wake up for 15 years. Heihachi's private corps, the
Tekken Forces went to the burial site and excavated the God of
Fighting. This unearthing unleashed its spirit which awakened
Nina's resting soul. Now controlled by the God of Fighting Nina
acts robotically with the command to assassinate Jin Kazama.