On Gotham, we've got Dustin Ybarra, who portrays Robert Greenwood. Greenwood is a crazy cannibal of women. Thankfully, he is recently deceased (Greenwood the character, not the actor).
Over on The 100, we've got Donna Yamamoto, who portrays Hannah Green, Monty's mom, aka "Momty." she's one of the most hated characters on the show, besides Pike. That's because she's a horrible person (the character). No wonder her own son is forced to go up against her to protect others!