In a scenario if you are not willing to delete the user from the database directly, you may remove them to prohibit them accessing the database for any use. Find below the steps to remove a MySQL user in database.

•     To access the MySQL Account Maintenance Menu, click on the icon above the words MySQL Databases on the main screen of your cPanel interface.
•     Scroll down to the user's name under Users.
•     Click on next to the user's name to remove their MySQL user.