I have some material drafted on using these in fiction.

Originally shared by Winchell Chung

Hmmmm, I wonder if this could be adapted to role-playing games. For rolling up the personality of a non-player character.

From article:

According to psychologists, the extraordinary variety of human personality can be broken down into the so-called ‘Big Five’ personality traits, namely neuroticism (how moody a person is), extraversion (how enthusiastic a person is), openness (how open-minded a person is), agreeableness (a measure of altruism), and conscientiousness (a measure of self-control).