Graphic Novels: Watchmen

An anti-hero in the acclaimed 1986 graphic novel miniseries Watchmen, published by DC Comics, Rorschach isconsidred the main  protagonist, as he drives most of the plot forward. In the beginning of the story, he is introduced as the only remaining active masked vigilante not employed by the government. A ruthless crime-fighter, his beliefs in moral absolutism and objectivism — good and evil with no shades of grey — have driven him to seek to punish evil at all costs. Rorschach's mask displays a constantly morphing inkblot based on the ambiguous designs used in Rorschach inkblot tests, with the mask's black and white coloring consistent with Rorschach's sense and view of morality. Rorschach is also frequently ranked as one of the greatest comic book characters of all time. 

Moore stated that Rorschach was created as a way of exploring what an archetypical Batman-type character — a driven, vengeance-fueled vigilante — would be like in the real world. He concluded that the short answer was "a nutcase."  Moore also stated that the tone of Rorschach's diary was inspired by the Son Of Sam letters David Berkowitz sent to the newspapers, and that his speech patterns were based on Herbie the Fat Fury. ~ from Wikipedia