Kazuya Mishima is a main character in the Tekken fighting game series. He's the son of Heihachi and Kazumi Mishima, and father of Jin Kazama. Kazuya is known for his complex relationship with his father, his ambition, and his struggle with the Devil Gene, a genetic trait granting him immense power but also fueling his rage and ruthlessness. He's been both protagonist and antagonist throughout the series, often vying for control of the Mishima Zaibatsu, a powerful corporation. His story involves betrayal, revenge, and a constant battle against his own inner demons.