Isabella was Edward Nygma's girlfriend who had a striking resemblance to Nygma's late ex, Kristen Kringle.

Who is the Riddler's girlfriend?

26 episode of “Gotham,” we saw Cory Michael Smith's Edward Nygma take another step towards his dark destiny as The Riddler by accidentally killing his girlfriend, Kristen Kringle (Chelsea Spack), after he confessed to murdering her abusive ex and sent her running for the door.

Who is Riddlers partner?

One of those new elements is making Ed Nygma's relationship with Kristen Kringle (or lack thereof) such a big part of his origin story. While Ed has a lot in common with the DC Comics version of the Riddler, and others, Gotham is taking its liberties with him in a few ways, including the focus on romance.