Answer
In "Unbroken", Miyavi portrayed Mutsuhiro Watanabe, a brutal and sadistic prison guard at a Japanese prisoner-of-war camp during World War II. Watanabe delighted in causing suffering to the prisoners and derived pleasure from his authority over them. He frequently engaged in physical and psychological abuse of the prisoners, making him a key antagonist in the movie and representing the cruelty inflicted upon POWs during that era.