think you'd find my main reasons for seeing the Kiriyama in the manga as an INFJ interesting... perhaps. For one, yes, he's definitely an introverted thinker. Come to think of it, in the beginning, it seemed that all of his other preferences were extremely overshadowed by introverted thinking, but as the game progressed I found that it was not so. I had the idea that the reason he's so adept at mastering things quickly were in part due to a highly evolved Ni, as well as excellent mimicry courtesy of a well-developed Se. And since his brain condition had something to do with blocking his emotions, he didn't give a shit about the world or how people around him felt. Hypothetically, an INFJ unable to realize Fe due to brain damage would have no interest in external judging, and thus would appear very much "perceiving". I'd go so far as to say that his cock-blocked Fe only manifested itself in minute ways, such as making an impression with dressing sharp, being elegant and stuff. Maybe subconsciously actually liked the hairstyle forced upon him by one of his pet uglies.
Actually, the real reasons for my assumptions are rather shallow.
1. Early in the Sugimura-Kiriyama fight, Hiroki claimed that Kiriyama seemed to "project Ki from within"... as if by magic. And, well, we uh, we all know INFJs are Magic People.
2. And did you see the way the guy moved...? HIS FUCKING SCHOOL JACKET WAS JUST FLOATING ABOVE HIM NO MATTER WHAT, WHAT THE FUCK MAN
That there is trademark INFJ grace! Only Magic People move like that!
3. Near the end of the story, Kazuo recalled that fateful incident from his childhood. He called it "The Bad Thing! The Bad Thing!" If that's not the introverted intuition way of a child defining a life-altering phenomenon, then I don't know what is. It led me to think that Kazuo Kiriyama must've had a developing Ni at that point of his childhood... then BAM,
I AM SUDDENLY ROBOTIC AND WITHOUT EMOTION. (check out the series of panels depicting his childhood before the incident, and you'll see that he was a pretty cheerful lad, smiling a lot, enjoying people, emulating his TV superheroes...quite unlike how I imagine the quiet and curious Ti-dominant child to be.) I suppose young Kiriyama was on his way to a cognitive development on the INFJ path before "The Bad Thing!" fucked around with his brains.
Again, this is just what I think about the Kiriyama in the manga. The Kiriyama in the novel was likely INTP. The Movie Kiriyama was more of a DICK.