The McCoy is another part of the Freudian Trio, along with The Kirk and The Spock. (Specifically, the Id.) Where the former is rational and intuitive, and the latter is cold and logical, the McCoy is emotional and humanistic. He cares about others deeply; for him doing the right thing is not a question of convenience or moral relativity, but about the concrete reality right now.
The McCoy has been suggested to play 4 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.