What would you call someone who:

Was rich but deliberately became poor.
Was comfortable but deliberately became uncomfortable.
Was living in a safe place but deliberately chose to live in a place that was very physically risky.
Had no potential of dying but deliberately chose to come to a place where he knew he would die and not just any kind of death but an excruciatingly painful death.
Was living in a place where everyone worshiped him but deliberately chose to come to a place where people would hate and despise him.
Was living as a king but deliberately chose to make himself a slave. 
Deliberately chose to spend time with some of the most disreputable people in society.
Deliberately chose to give himself up for people who hated him.
Deliberately chose to give himself up for people who had nothing to offer him.
Deliberately chose to give himself up when he knew he would get nothing that he needed back.

What would you call a person like this?

You would call him Jesus.