In professional wrestling, a heel (also known as a rudo in lucha libre) is a wrestler who portrays a villain, "bad guy", "baddie", "evil-doer", or "rulebreaker", and acts as an antagonist to the faces, who are the heroic protagonist or "good guy" characters. Not everything a heel wrestler does must be villainous: heels need only to be booed or jeered by the audience to be effective characters, although most truly successful heels embrace other aspects of their devious personalities, such as cheating to win or using foreign objects. "The role of a heel is to get 'heat,' which means spurring the crowd to obstreperous hatred, and generally involves cheating and any other manner of socially unacceptable behavior."
To gain heat (with boos and jeers from the audience), heels are often portrayed as behaving in an immoral manner by breaking rules or otherwise taking advantage of their opponents outside the bounds of the standards of the match. Others do not (or rarely) break rules, but instead exhibit unlikeable, appalling, and deliberately offensive and demoralizing personality traits such as arrogance, cowardice, or contempt for the audience. Many heels do both, cheating as well as behaving nastily. No matter the type of heel, the most important role is that of the antagonist, as heels exist to provide a foil to the face wrestlers. If a given heel is cheered over the face, a promoter may opt to turn that heel to face or the other way around, or to make the wrestler do something even more despicable to encourage heel heat. Some performers display a mixture of both positive and negative character traits. In wrestling terminology, these characters are referred to as tweeners (short hand for the "in-between" good and evil actions these wrestlers display). WWE has been cited as a company that is doing away with the traditional heel/face format due in part to audiences' willingness to cheer for heels and boo babyfaces.
https://en.wikipedia.org/wiki/Heel_(professional_wrestling)
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