MySQL stores the list of users in the mysql.user table. List of all databases are available in the mysql.db table.

Show list of MySQL users

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# Show list of all users
select user from mysql.user;

# Show list of users assigned to a particular database
select user from mysql.db where db='databasename';

Show list of databases for a user

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# Show a list of databases a particular user can manage
select db from mysql.db where user='dbusername';

Delete a user

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# Delete an user from all MySQL users. 'dbusername' must exist.
drop user dbusername@localhost;