I'm thinking we need a catalog of personality modules. I have noticed that some people have features of their personality that are very similar to a relative's, and not necessarily their parents, which means there is likely a genetic component.
We are a little better with physical traits. We can measure a person's height, weight, girth, shoe size, color of their eyes, length of their ear lobes and any number of other physical characteristics. But we could be doing better. Can a person snap their fingers? Spread their fingers like Mr. Spock from Star Trek? Wink with either eye? I fail on the first two, but I can wink okay. Some people can't. These are simple, and trivial, but I am sure there are numerous other physical tests whose results might be enlightening.
Personality 'modules' might be a little harder to qualify. Then again, psychologists may have already done this, but they are just not sharing their catalog with the rest of us. Or maybe I just don't circulate in those circles.
The Grifters (1990) Official Trailer - John Cusack, Annette Bening Movie HD
They are kind of like grifters that way. Grifters are always on the move and always looking for a new mark. Marks are few and far between, and you don't want to be seen in same area where a con was recently pulled. Someone might get wise and then things might get a little uncomfortable.