Here, Parzival, I took in you're input and improved it.

I just thought of a new Oc, His undercovername is the Headless Horesmen he was a buisness man that commited a crime of murder and later was crushed in an earthquake, he was trapped under the rubble and his ghost was trapped on earth. He lost all of his previous memory and became a detective. He obtained robotic parts that he could uses as somewhat of a human body