As I said in my earlier post, I'm currently re-reading the Watchmen graphic novel. It's quite a few years since I last read it in the 80's (I'm an old b**d) and this time I'm trying to view the characters from a typological perspective.
Rorschach is an extremely interesting and well-written character who strikes me as an Introverted Feeling type, which makes him ISFP or INFP. His strong Fi moral values are the guiding principles of his entire life.
His values are, however, extremely black-and-white, which is basically the whole theme of his character: Rorschach blots are composed of black and white shapes which never mingle to form grey.
His auxiliary function is Se, it isn't his dominant because he only seems to switch it on when needed, and at other times he misses some really obvious clues. He uses Se mostly in combat situations, where he demonstrates extraordinary reflexes and a mastery of his immediate environment. He can turn just about any ordinary object into a deadly weapon, for example, he even uses a toilet to kill an enemy in one scene!
He does use Intuition quite a lot, but as a less effective tertiary function, similar to the way that ISPs use it in real life. It's mostly Introverted, he uses it to generate hunches and make broad leaps from a few salient facts, but he seems to understand that they are just speculations which need to be verified by facts, which he trusts more (ie. he prefers S over N). One of his catchphrases is "must investigate further..." meaning he needs to gather more facts (S) to support a theory (N).
Tertiary Ni in ISXP types can get out of hand sometimes, seeing conspiracies and plots everywhere. Although Rorschach was the first to notice the clues behind the wider conspiracy in Watchmen, he was already quite paranoid as a result of his overblown Ni function.
Although he is clearly very intelligent, his inferior Extraverted Thinking function becomes apparent when he tries to apply logic to solve problems.
He starts muttering out loud, it seems to take a great deal of energy and concentration to use this function (at one stage he complains of being "too tired to think") and his conclusions are either too simplistic or excessively complicated.
There are a few wonderful scenes in the novel, when he is working with Nite Owl (who is dominant Si) to solve the mystery. Rorschach gets totally lost in convoluted trains of thought, straining as hard as he can to make sense of the conspiracy using logic (he even explicitly states that this is what he's doing). Then Nite Owl spots a simple yet vital clue using his own Sensing function, which Rorschach had totally missed!
Those two characters were meant to work together, as they complement each other's strengths and weaknesses perfectly.