Enneagram of Personality: 9 types of characters

Lately I found this page on wikipedia, about the Enneagram of Personality. It's a very comfortable way to look at your script's characters and understand their personality pattern. There are nine patterns: The Reformer, The Helper, The Achiever, The Individualist, The Investigator, The Loyalist, The Enthusiast, The Challenger, The Peacemaker.

The Enneagram describes those personality patterns, including character's motivation, healthy- and unhealthy state of being, fears etc.

I find it extremly helpful for screenwriters to use such tools, as George Clooney says in Up In The Sky: "I stereotype. It's faster".