That makes sense -- this and a few other replies are making me doubt my ability to accurately weigh the evidence. The pro-narcissism examples tend to be vivid and exciting and so are more memorable than anti-narcissism examples which tend to be ordinary and less interesting. One solution might be to re-read a large-enough sample of HPMOR and rate how indicative of narcissism is everything Harry says or does. This would be interesting but would take some time. I'll be much less confident in my conclusions until I do this.