Son of Heihachi Mishima and the one who possesses the devil gene, Kazuya Mishima...
During the King of Iron Fist Tournament 4, Kazuya suffered a defeat at the hands of Heihachi and later Jin at the Honmaru. When he finally regained consciousness he was surrounded by a Jack-4 squad.
"G Corporation! So they plan to take me out too"
Kazuya teamed with Heihachi to fight off the successive waves of Jacks until he saw his chance and left the Honmaru without Heihachi.
He morphs into a devil and takes flight just as the Honmaru explodes. Kazuya, determined to exact revenge on those who betrayed him, decided to enter the King of Iron Fist Tournament 5.