How to Delete a User From Your PlayStation
While deleting users from your PlayStation 4 makes room for more of your content, you might want to check with the individual who created the account before proceeding as to not delete any of their important information.
What Happens to a Deleted Account?
When deleting a PlayStation account from your system, any data related to the user including saved game data and screenshots are deleted. Additionally, any games, applications, or media that was purchased by the profile will become inaccessible as the license to that content will also be removed; the one exception is when another user on the system also owns a license for the material in question. Playstation accounts can be redownloaded to a system if a user wishes to use your console again. The deletion process as outlined above does not entirely remove an account from Sony’s system; a different process must be followed if you wish for an account to be wholly deleted, but this does delete the account from your system.
How Can I Avoid Creating Accounts for Guests?
There might be times when downloading a profile to your PlayStation is too troublesome; for example, when someone wants to merely join in a game that you are playing. If you only need a temporary account, consider making a Guest account for your visitor. Instead of logging in with a user account when prompted, select the Add New User option but then select the Guest Account option.