The Fox series Gotham took an interesting approach by having two characters embody the spirit of The Joker; twins, to be precise.
Jerome demonstrated violent tendencies a young age, and after killing his mother, he started embodying the nihilistic anarchist aspects of The Joker, eager to spread chaos and madness throughout Gotham City.
He also became physically disfigured when his face was cut off right before being resurrected… that’s right, he was dead for a time.
We were first introduced to Jerome Valeska as a guest villain in Season 1, and after returning for brief stints in Seasons 2 and 3, he was a recurring villain in Season 4.