Hmmm, I like your idea of bad Ji leading to TOM issues.
I have a truly narcissistic aunt who is some kind of Extravert. She's also got the grandiosity thing going on. I'd say extraverts are more prone to be classical narcissists, and introverts may be more covert narcissists. Or people lower on the social ladder are more covert narcissists.
I think Ji may feel that narcissistic, but I don't think it's so much that as having a compass function in ego position. I'd say stubborn and self preserving more than narcissistic?
Yes to Pe and mania/hysteria/impulsivity... lol. I got one of them aunts too.