Avoid 'Demographics' in Personas
In 'Bring Your Personas to Life!' Zef Fugaz suggests ways for us to get into our personas heads but I think there's something wrong with the language he uses in one part:
"…may include information about the persona’s demographics, attitude, goals, environment, and how he or she will interact with your software … More advanced personas will also include detailed descriptions of activities or scenarios"
Instead of 'demographics, attitude, goals' a persona should focus on particular things the person does, how they feel about specific things, what they wear etc.
The point is that words like demographics and attitude suggest something other than personality.
Personas are for everyone involved in a project - the developer and the client, so they've got to be highly descriptive and easy to relate to - any hint of graphs or charts is to be avoided.