Unlike the other personas, this kind of persona does not emerge from the user research but from our experience during the UX process or from the UX team itself. We, as UX professionals, and together with our UX team, are required to make assumptions based on our past interactions with the user base and products to deliver a picture of what, perhaps, typical users look like.
This kind of persona allows us to involve the users on our UX design process in the early phase, but, of course, we do not consider them as final personas, or as a well-defined user base – we just use them as a guide for the development of our product's early stage.