A psychopath is the sheid mentioned in the Gemara (Rambam, Guide 1:7).
As for a narcissist, there is a story about a bachur who rejected every shidduch suggestion as not good enough for him. his rebbe told him to learn Mussar for a year to become an anav. After the year was up he said that now that he was an anav they were certainly not good enough for him. In fact, the Gra says (Even Sheleima 2) that the torah iscompared to water because everything it is pored on grows. Someone who has naturally a bad midda who learns Torah will become even worse. Rav Aviner added that he will even find rationalizations in Torah for his behavior thus magnifying the chillul Hashem. I, in fact, know someone like this.