Cliff Steele was involved in a car accident that tore his whole body apart, the only thing surviving was his brain and The Chief put him back together in the form of a Robotman. 

Now Cliff as a human was a daredevil, also cheated on his wife. But as a Robotman, he's sort of on a redemption arc trying to become better seeming he's been giving a second life essentially. When you speaking as The Robotman, I don't need heavily voice modulated. Look at the clip below to give you an idea...

https://www.youtube.com/watch?v=iMI6m9YaVpY