Hitman
How much do you know about the anti-hero known as 'Hitman'?
Hitman is a violent, darkly humorous and occasionally romantic comic book from DC Comics, written by Garth Ennis and illustrated by John McCrea. The series stars Tommy Monaghan (with a silent g), an Irish American hitman from Gotham City who only takes out contract killings on "bad guys".
Ref. Answers.com
Nothing like a bad guy that walks the line between right and wrong. But it takes place in Gotham which is of course Batmans stomping grounds. But Batman and him rarely clash, because what can he say to hitman? Batman walks the line himself! So hitman goes around taking out bad guys for a price, almost like a bounty hunter.