He's an alcoholic, chain smoking journalist addicted to various drugs. His articles are all based around his belief to tell the truth and he does so with the most direct and blunt manner possible.
His bad ass qualities aren't the only reason he's such an awesome character but it's the futuristic setting he's placed in. Everything from his two headed pet cat to a home appliance that gets high.
You should definately go read transmetropolitan if you aren't a child nor are you sensitive to volience, swearing, sex and aliens.