Carl Grimes is the son of Rick Grimes and he was raised in the apocalypse since he was just a kid. He adapted pretty quickly to the new world, having very good aim and being capable of using firearms, even going as far as killing people if it was necessary when he was still a child. He lost his right eye in a fatal accident and since then he changed completely, turning more cold and less emotional. Years later, after the war with saviors, he regained his morality and became a much better person.