For those who doesn't want their root password on Kali Linux live USB persistent login to be reset to the default 'toor',
Once you have changed your password using passwd root command, edit /lib/live/config/0031-root-password and comment out the line
before: usermod -p 'X014elvznJq7E' root
after: # usermod -p 'X014elvznJq7E' root
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