As a Super Admin you can create and delete user accounts. You can also recover them via the Restore function.
If you have the Super Admin (or User Management Admin) privileges on your G Suite Account then you can access the Admin Panel and Add, Suspend and Delete user accounts from your domain.
When an Account is deleted all of the associated data in G Suite (e.g. Email, Drive items. Calendar etc.) will be permanently destroyed.
However there is a period when the account is Restorable. This used to be upto 6 days but was recently (October 2017) raised to 20 days.
In the Admin Panel