The "Devil Gene" is a fictional concept from the popular video game series Tekken. It refers to a powerful and malevolent force that can manifest in certain characters, granting them enhanced abilities and a darker persona. The most notable character associated with the Devil Gene is Kazuya Mishima, who struggles with its influence throughout the series. In the Tekken storyline, the Devil Gene is often linked to themes of inner conflict and the battle between good and evil. Characters like Devil Jin and Heihachi Mishima also exhibit traits related to this gene, showcasing the ongoing struggle for control over their darker instincts.