User Personas are a very good tool for the product owners, business analysts or product managers to be able to co-create with designers. It is predominantly a product of the user research and should not be an amalgamation of demographic data. It is the best way for us to list all scenarios that a persona would take when they want to attain a goal. It is predominantly used to build empathy with user, focus the team and build consensus in a large diverse stakeholder group. The website I referred to is here: https://www.smashingmagazine.com/2014/08/a-closer-look-at-personas-part-1/