A steadfast young man lost without an aim in his extraordinary sight.
Cain is stubborn and steadfast, following firmly what he believes is right and wrong. He had always set himself goals, step by step procedures, for his whole life. He also has a decent intellect, and could detail every step of his goals. He was never the most social of people, as his plans did not appeal to many others. His view of people is quite defined, fitting them into ordered descriptions and only a few people put up with this generalisation to break through Cain's stereotype and to be on familiar terms with him. While he still retains his ordered lifestyle he appears as a particularly caring and nice guy to these few, and will go to extra lengths to protect and assist those he cares about. He can steel himself particularly well when it comes to doing less savoury of tasks, meaning he becomes almost robotic in his actions although a single word could break this temporary shell.
Now that the life of the world is decimated Cain is particularly aimless, unable to follow the patterns he has had all his life. This makes him more vulnerable and more personable then otherwise. Presently he is searching for an aim, something that can be defined for him to pursue.
There is plenty around and Cain is not averse to scavenging from the dead. He prefers to wear decently smart clothes, but doesn't dress stupidly for whatever task is at hand.
To be revealed... To be honest there isn't much to it.