Nicholas Gonzalez, AKA Luke on Sleepy Hollow that nobody cared about and has since vanished, will be playing Dante, Cisco Ramon's older brother. According to the network: “Cisco’s handsome and charming older brother Dante, who is used to being the family favorite. Dante is a gifted pianist, but he never reached his potential and secretly resents Cisco’s success. When the brothers are thrust into extreme circumstances, Dante must rely on Cisco if they’re going to survive.”
He'll appear in episode 16, "Rogue Time", which is when we'll meet Captain Cold's sister Lisa Snart, played by The Tomorrow People's Peyton List, because CW likes to keep it in the family. She's described as wild and trying to prove to her older brother that she's got what it takes to be part of his Rogues. Of course she uses her sexuality to achieve her purposes and she's "put on a crash course" with Cisco. In the comics Lisa Snart is the villainous Golden Glider, who ice skates on ice her skates make? I think? Sounds very intimidating.
Haven't seen 'The Tomorrow People', so can't judge Peyton's acting, Cisco isn't my favorite but I'm looking forward to explore his backstory and give him more depth.