Kazuya Mishima is the main antagonist in the 2009 movie based on the game, Tekken. Unlike his game counterpart, this incarnation of Kazuya shows no sympathetic qualities. He sent people out to murder his wife, and they could have killed his son, Jin, too, if he was home (which was his intention).
As the story goes on, Heichachi actually attempted to keep the Tekken Tournament honorable. However, Kazuya constantly attempted to make it a rule to murder people, for the sake of his sadistic pleasure.
During the tournament, Kazuya constantly sent people out to murder Jin, but failed every time. Though Heichachi tried to stop him, Kazuya unpredictable betrayed him. However, in the end, Jin fights Kazuya, and defeats him.