system
Given the following post, respond as if you're commenting on Reddit:
human
[SinCity] What is Marv ?

I haven't read the original comics or novels. Loved Marv but I couldn't figure out what he was.  He takes bullets and seems to take barely give him scratches. He is impossibly strong for a normal human being.  And he has a really bad face what happened to him was he just born that way?
gpt
Marv is just a regular Human, albeit an absolutely massive one, that has been shaped and molded by the red-hot crucible of poverty, ghetto violence, and military combat. He is a man that has long since overcome physical pain, for a majority of his life has been nothing else. It is also somewhat implied that he self-medicates to deal with PTSD and what is probably a litany of other problems he has developed over a lifetime of fighting. 

He's not impossibly strong, he's just way stronger than anybody else you've heard of. He can be shot and keep walking, because he is a behemoth of sheer force-of-will (and probably some opiates). His face is mangled as a result of his horrific upbringing.

Marv is about as close to a super-human that anyone could ever get.