Identify this person, listing physical attributes, habits they have, things they say. Identify what it is you could research that pertains to this person. If you decide to write about a coworker, for example, you could do research on the company where you work or about the workforce in general. If you know someone who has gotten involved in drugs or has had legal issues, you can incorporate laws, punishments, etc. into your narrative.
I'm leaving this prompt open and vague so that you take it in any direction you seem fit. You don't necessarily have to bring research into this blog post; rather, this is a way to help you brainstorm ideas for possible research topics that pertain to a person or people you know.