Dairou was first introduced in Mortal Kombat Deception as a neutral Seidan Mercanary. He is introduced in Konquest mode when he breaks Shujinko out of an Orderrealm jail, killing the guards in the process. It is here we see how ruthless this man is and even Shujinko questions his actions and why Damashi would send such a brutal man to help him.
Dairou is most well known for his excellence in the Wing Chun martial arts. He has killed many men thanks to this style and is very thankful for earthrealm for developing such an excellent technique. He also knows some degree of Escrima and Mi Zong and his weapon of choice is the Autumn Dao.
Deception bio card:
"I was once a member of the Seidan Guard. I believed in the power of Order and lived by this strict codes of my superiors. I had saved many lives during my years of service. But when I killed an assailant in a fit of rage. I was arrested and sentenced to a life of incarceration. For all the good I had done, the event that had come to define me was that one moment of Chaos. I eventually escaped during a riot incited by the resistance. I emerged from the prison a changed man. No longer would I follow orders of the Seidan. Neither could I bring myself to give in to Chaos. I opted to serve myself. I became a mercenary, a warrior for hire, and have become revered in Orderrealm's secret underground. My neutrality has been put to the test, however, as my current contract is to find and kill my former guardsman, Hotaru."