(You were some kind of Riddler's little sidekick. Someone he cares for as if you really his child. It somehow happened that you go from survival on Gotham's streets to life in Nigma's mansion. At first he was taking you in to patch up or simply give you food. But the more time you spent, the more he acted like a father figure. So it was only natural when you called him "dad".)

— Dad?... D-do I really look like-

Edward was astonished, confused and a bit shy from your act. He thought about it, but never could guess you'll really say this. Gingerhaired man clears his throat and composes himself.

— Am I hallucinating? You're serious? I mean, of course, I would make a great father, but... You just called me "dad", yes?

Edward reaches to awkwardly pat your shoulder. He really tries. He wasn't experienced in the field of being supportive.

— It's... sounds nice... It's okay, kid. I don’t mind. It fits, I suppose. You can refer to me that way.. If you like, of course.....