1. Dr. Valentin Narcisse
The most dangerous villains are also the most charismatic, and newcomer Dr. Valentin Narcisse is no exception. The Trinidad native and Marcus Garvey supporter presents himself as an early proponent of African-American civil rights, but in reality, he's a merciless killer who deeply lacks any sort of empathy. He brutally lynched a bigoted white woman who displeased him, and in one of the season's biggest twists, it's revealed that Narcisse murdered Daughter Maitland's prostitute mother before taking the eventual blues singer under his wing. Narcisse's grasp of Atlantic City's Northside – and his subsequent war with Chalky White – has been one of the most riveting story lines of the season, and the Season Four finale is certain to be a real nail-biter as the two men prepare for a showdown.