The guys take the "Open-Source Psychometrics Project" Character Personality Quiz. From the site:

People who take the quiz are asked if they would also be willing to volunteer to rate characters that they know. The ratings are made on a 100 point scale between two adjectives and then all averaged together into a composite. Because of the "law of large numbers" (a.k.a. wisdom of the crowds) this profile is very accurate. Much more accurate than a description just written up by one person.