Gotham has become infamous for it's inclusion of villainous characters. Whether you love it or you hate it you can't deny that Gotham have included or hinted at too many characters. For being a Batman prequel, Gotham has included many characters that are pivotal to Batman's origins. The inclusion of characters such as Jerome, Carmine Falcone and "Harley Quinn" has made Gotham the most polarizing comic book show in history. Is there any characters that Gotham can use that won't upset fans and mess with the Batman mythology? Well there is a few that a lot of people will be happy to see..
With Theo Galavan all but confirmed as the front of The Court of Owls, Talon is a villain that has to come to Gotham. The Talons are a breed of deadly assassins that are absolutely loyal to the Court of Owls. They remain "sleeping" deep within their inner sanctum until they are "called" upon. A serum was eventually developed that could bring the dead Talons back to life. Some talons appear to be unkillable, surviving knives through the skull, electrocution, dismemberment, falling from the height of a skyscraper and even decapitation. Their only known weakness is cold. If exposed to extreme cold the Talons will revert to a vegetative state. The only verified means to kill a revived Talon is a poison developed by the Court. Oh, and to become a Talon, you have to kill the current Talon in combat, very pleasant.
If they didn't sound like a big enough threat already the Talons are highly trained and extremely proficient with knives, and experts in hand to hand combat. As if Theo Galavan wasn't threatening enough, not only has he got a team of psychotic serial killers at his disposal, he now has an army of assassins. Jim Gordon better watch his back!
No not that abomination that was Richard Sionis, I want Roman Sionis, the ruthless crime lord that has tormented Gotham for years! In a show whose first season was based on gangland warfare, Black Mask would fit in famously, rivalling Penguin for control of Gotham. In the comics, Roman Sionis' parents were self-absorbed, caring more about their social status than their son. He was dropped on his head at birth and even attacked by a rabid raccoon, but it was all covered up of course to maintain his parents status. Once his parents died, he took over the family business, but it was soon bought over by Bruce Wayne. The humiliation of this led him down the path of Black Mask.
Sure you'd have to twist his origins about since he can't be the same age as Bruce, or you could just adapt it to fit around Gotham's timeline. Instead of adult Bruce buying Roman out, have the young Bruce Wayne, who has a control in the company, buy Roman's company. This could be the beginning of a Black Mask arc that could establish the villain and his motives.
There was also a theory that linked Black Mask to the murder of the Waynes, but I think it would be a greater twist if Theo Galavan and his Court were behind the murder but that's for a different day!
In a show based on detectives, why not bring in The Question? Most famous for his run in Justice League Unlimited, The Question (aka Vic Sage) is a paranoid, conspiracy theorist loving, investigative journalist, hell bent on exposing America's most corrupt. Question would be a great addition to Gotham, can you imagine him and Jim Gordon on a quest to take down Gotham's most corrupt such as Flass and Loeb? The mysterious introduction of Galavan is a goldmine for a theorist like Sage, which would be a great way to introduce him.
Have Sage investigate Galavan, make him the person to reveal his dark ways and his family's ties to the city.
With a 10 year gap between Gotham and the beginning of Batman's career as a crime fighter, it is inevitable that they will introduce more characters from Batman's rogues gallery, and his most trusted allies. This isn't a bad thing. Batman was created so Bruce could rid Gotham of the evil that plagues it. Yes, his existence creates half of the villains, but most of them do pre-date Batman, such as Penguin, Ra's Al Ghul and The Falcone's. Gotham is doing a fantastic job thus far, I can't wait to see what else they have in-store!