There is the default MxAdmin user and you can create demo users. But other then that you will need to create the users yourself.
I think you have been mistaken in understanding the question .
I want to import a list of person in the app. So, Please let me know if Mendix provide pre-intalled (default list) list of person which I can use.
If Yes, how can I access that list?
You can for example use the excel importer module to import person into your application.
I’m not familiar with pre-installed list of persons. When you are talking about user roles, the Administrator and User roles are default available.