Jun is an officer of the wildlife protection organization WWWC. She is called "The Chosen One" by her relatives. She is highly psychic, being able to sense that Kazuya Mishima's power stemmed from Devil. At the WWWC's orders, she sets out to arrest Kazuya, who smuggles environmentally-protected animals. When the King of Iron Fist Tournament 2 was coming to an end, Jun comes to the stunning realization that Kazuya's supernatural strength stems from Devil. But she cannot help being drawn to him by a mystic force beyond her control. She then became pregnant by Kazuya Mishima. After Kazuya was thrown to the volcano by Heihachi Mishima in the conclusion of the tournament, parts of Devil left him and attempted to possess Jun's unborn child. However, she was able to defeat him and fled to the forests of Yakushima, where she intended to raise her child away from evil and danger. She later gave birth to a baby boy, whom she named Jin. Fifteen years later, before the events of Tekken 3, Jun sensed the approaching of Ogre and warned Jin to seek out his grandfather Heihachi should anything happen to her. One night, Ogre did indeed attack. Jun screamed for Jin to run away, but he wished to protect his beloved mother from Ogre and charged at him, but was well outmatched and was quickly knocked unconscious. When Jin woke up, the Kazamas' house had burned to the ground and Jun was missing. Jin searched frantically through the rubble, but could not find his mother anywhere. Jin was devastated and swore revenge on Ogre.........
Jin's personality ranges from calm to angry at various moments, and his words and actions hint toward the bitterness within. He also has one personality trait which is common with many Japanese action heroes. Once Jin's mind is focused in any particular direction, it is very difficult to get him to change or even notice the events and people around him. People close to him, including his friends Ling Xiaoyu and Hwoarang, are always going to extremes to gain Jin's attention, and yet, he rarely seems to notice. It is known, however, that he will help them if they need it, as Ling Xiaoyu's Tekken 4 profile and Hwoarang's Tekken 4 ending have shown.
Jin's disinterest in close relations probably has one unique motivation. As a result of his family's Devil Gene, Jin knows that people close to him will likely suffer or worse if he ever completely loses control. In addition, Jin may not show any interest in women because he plans to wipe out his lineage entirely. During Tekken 4, Jin planned to kill his father and grandfather, and then himself, dying without children to put an end to the Mishima bloodline once and for all. However, Jin could not go through with the deed after defeating his two predecessors, so it's unknown if he has given up on this plan completely since then.
Jin is a Japanese male with black hair that is spiked upwards, in a style similar to the hairstyle of his father, but with the bangs of his mother. In fact, in the early screen showings of Tekken 3, many fans assumed that the yet unnamed Jin Kazama is Kazuya in his early teen years, due to their similarities. Jin is also very muscular and toned, as evidenced by his large biceps, visible abs, and pectoral muscles. Jin has a black mark on one of his arms, which Devil has branded onto him. Jin has worn a great deal of outfits in the course of the Tekken series. Many of these outfits feature flames on them, and with the exception of a single outfit in Tekken 6, he always wears either gloves or gauntlet