List their age, gender, marital status, number (and age) of children, and where they live.
Include their job title and annual income if necessary.
What books, magazines, and blogs are they reading? Do they go to conferences? Who are their "gurus"?
This may be why they'll ultimately seek you out.
For example: My client has a hard time putting their needs first. They will want to spend the money used on my services for their kids first.
Are they the decision maker?
What do you offer that really appeals to them?