How to delete users under System.User module?

There’s 3 Users created in the System.User that I’m not able to delete  - MxAdmin - MyID which is A0285176 - And an ‘Anonymous’ user     What’s the reason why I can’t delete them or tie any User with them from my own module?  I wanted to create the A0285176 username from my module but to do that I needed to delete that from System.User but I’m not able to. This is actually preventing my from my development.
1 answers

You can create a microflow to delete that specific user : 

retrieve user from database [Name = ‘name of the user’]

delete that object.