I also want to suggest that a person's individual temperament has a LOT to do with if they are chosen by a narcissist, borderline, or other dysfunctional being.
If you are mostly sanguine, that means you tend to see everything in life as a laughing matter, fun, humorous...and you pretty much do things in a fun, enjoyable way. With the sanguine friend in our original group, X didn't seem to really CONNECT. X preferred staying in a constant state of depression or cynicism.
If you are mostly the phlegmatic type, this means you are laid back, peace at any price, non-committal for the most part...just "everyone try to get along"...X handled the Phleg of our group, very RELUCTANTLY, and constantly tried to make Phleg more like her, which, in her opinion, was taking way too long, so she eventually moved on to a more worthy target.
If you are mostly melancholy, YOU ARE THE PERFECT PREY TO A NARCISSIST!...you are emotional, unsure at times, you tend to doubt yourself and flip flop back and forth, you tend to want to be perfect and beat yourself up when you aren't. You get caught up in the moment of things, so you don't usually finish what you begin. X handled the Melancholy friend as her SERVANT/SLAVE for the most part...promised her the sun,moon and stars, but then began beating Melancholy down with critical words. N's LOVE melancholy prey, because they are "moldable" and tend to be looking for someone to "lead" them and "direct" them. (in my estimation, the majority of Codependents, tend to be mostly MELANCHOLIES...though not ALL of them are)
If you are mostly CHOLERIC, you are DRIVEN, goal-focused rather than people-focused, and you GET THE JOB DONE. You tend to not like working with others, because you feel you can zero in on things and get them done, but you don't pay enough attention to details, so sometimes what you have done is not stable either. N's will sometimes hook up with Cholerics, because they tend to not show their emotions and see emotional people as somewhat WEAK. X hooked up with me, who, having just come out of a relationship with a BPD, was, by appearances, seeking a "leader" in my life. We immediately clicked, she showered me with gifts, told me I was her one and only that understood her, introduced me to her family and some "friends" and soon after, decided I was NOT heeding her, not complying, and daring to OPPOSE her ways...therefore, the devaluation process began, I was discarded, replaced and demeaned and she moved on to victim next.