Cult of Jerome

Two copycats of Jerome Valeska are minor villains in the series Gotham, appearing near the end of the second season's third episode "The Last Laugh". They are a pair of men who at night see the news of Jerome's reign of terror on Gotham and his attack on the Gotham City Police Department. The pair begin to laugh maniacally in a similar manner to Jerome. Noticing a passing bum, they follow the man into an ally and knife him to death. Then one of the men proceeds to stab his friend repeatedly to death.

Trivia

 * The two men act as one of many candidates for the origin of the supervillain Joker, with the surviving man possibly continuing on Jerome's legacy.