"Evil overlord" refers to a fictional character who is a powerful ruler with malicious intentions. They often seek to dominate or control others and may use their power to harm or exploit people. Full definition
The targeting then becomes more about the personal beliefs and anger of the attacker — not the prominence of the attacked — which is why the choice of evil overlord du jour often seems a little strange. (judithcurry.com)
Players control a mage who has weaseled himself into the inner circle of Demonaica, the rather generically named evil overlord who does... evil things. (stickskills.com)
The surreal narrative follows unwilling prophet Twinsen as he journeys across his world to defeat evil overlord, Dr. Funfrock. (theguardian.com)