a cruelly malicious person who is involved in or devoted to wickedness or crime; scoundrel.

a character in a play, novel, or the like, who constitutes an important evil agency in the plot.

villein.

noun

hero , heroine

noun

antihero , blackguard * , brute , caitiff , creep * , criminal , devil , enfant terrible * , evildoer , heel , libertine , lowlife , malefactor , mischief-maker * , miscreant , offender , profligate , rapscallion , rascal , reprobate , scoundrel , sinner , wretchnotes:a villain is a bad or evil person; a villein was a feudal serf in medieval europe , blackguard , boor , charlatan , creep , dastard , delinquent , demon , heavy , iago , knave , lout , mountebank , ne\'er-do-well , recreant , rogue , scalawag , scallywag , scamp , traitor , varlet , wrongdoer