Eight major DC characters nearly appeared in Gotham, but circumstances kept them from making their debut. As a prequel to the Batman mythos, Gotham was well-known for its creative reimagining of iconic villains and allies, offering an opportunity to witness the evolution of characters like Penguin, Riddler, and Catwoman. Over five seasons, the show balanced its own unique twists with homage to the source material, delivering a dark yet compelling narrative about the descent of Gotham City into chaos.

https://screenrant.com/gotham-dc-characters-scrapped-list/