To me a DQ/DK is someone looks for extra drama or tries to stir stuff up when there is not enough. The ones I have known have liked the extra attention they are getting while dealing with the drama. They have had a whole lifetime of reinforcement to develop this personality trait.
I learned to avoid the DQ/DK by looking for people who can solve problems as they arise. They can "suck it up" when some things go badly (not always, but often enough). I try to look at past relationships and see if extra drama was there.
I understand a reasonable amount of drama. Basically, I look to see if the person seeks to increase it if they have the chance to diminish it.