Very true, but I doubt that many people would deny that Chris has some kind of personality disorder. I'm not a shrink, but I can read the DSM-V as well as any layman, and it's obvious that he suffers (or enjoys) a very robust amount of narcissism. From what I've read, mildly autistic people are often confused with narcissists: the lack of interest in/concern with other people, the near-total preoccupation with self, etc. Of course, even the legal documents refer to "the autism spectrum," and some cases are more severe than others: plenty of autistic people are able to function quite well with support from others, and aren't just sitting in a corner muttering. I don't think that autism is Chris' primary distinguishing characteristic: yes, it's obvious that he's not firing on all six cylinders, but that doesn't explain his actions. I imagine that very few autistics rape their elderly mothers or claim, with increasing insistence, that they are "God-Jesus-Christ-Christine-Savior-of-the-World," etc. But someone with a psycopathic level of narcissism just might do such things. Having used the word "psychotic," I should add that I don't think Chris is clinically insane: I think he's simply an evil-hearted little snot who's given in to his whims, fantasies, and darkest impulses ever since puberty or thereabouts, and people have been enabling him all his life: first his parents, and more recently such white knights as Null. But I don't blame his parents or the white knights: the only person to be blamed for Chris' wretched life choices is Chris.
And, although this is probably a minority opinion, I don't buy Chris' belief in the "other dimensions" or the "dimensional merge" for a minute. I think his entire world-view, like the Lego high school model, is a carefully crafted ploy to gain attention, and respect from anyone dim enough to humor him. I think he has a great imagination; I don't believe he's delusional.