I haven't written my persona, but we are yet to decide on our product. For our personas to be successful, we need to set them relevant goals, skills and attitudes to in turn develop a relevant set of requirements.
From Cooper:
"Use the right goals
Each persona should have three or four important goals that help focus the design. Keep in mind that goals and tasks are different: tasks are not ends in themselves, but are merely things we do to accomplish goals. Not just any goals will do, though, so it's important to understand which types will help you make design decisions."
"... personas must be context-specific—they should be focused on the behaviors and goals related to the specific domain of a product."
It is important to make sure that we can identify these critical goals, and that we don't have these goals covered by multiple personas.