In article , says...

This one certainly appears appropriate:
http://en.wikipedia.org/wiki/Asperger%27s_syndrome



It's a little hard to call whether MX's affective disorder is more on the
"Narcissistic" or "Asperger's" spectrum.

Both involve extreme overvaluation of one's self, lack of empathy and
misreading of others' intent, and both have different degrees of
debilitation, but generally Aspergers is considered less debilitating, less
of an "illness" and more of a "trait". Bill Gates, for example, is perhaps
the world's best-known Aspergers case, but is still functional at a high
level.

That's mostly why I would opt for "Narcissistic" in MX's case, as his
functioning is completely removed from reality. His intelligence is real,
but his estimation of the value of his contribution shows a high level of
dissociation from reality, and he is incapable of understanding the value
of others' contributions. The world turns around confirming the
all-encompassing authority of his own assertions, and he will freely resort
to every form of artifice and intellectual dishonesty to uphold this
principle.