Two of my favorite story arcs was Theo Galavan and his sister Tabitha in Gotham which I feel didn't live up to it's full potential along with the Children of Arhkam story line in Batman Tell Tale. I know the story of Thomas and Martha has been done before and I think it was retconned as being a lie but I think it'd be interesting to see main canon Bruce react to the Children of Arkham and the revelation his parents had people committed and ruined the lives of anyone who got in their way. I think that'd be interesting to see here's my idea Theo and Tabitha form an alliance with Cobblepot (since in the comics he has a vendetta against the Waynes for similar reasons) and Oswald is the first villain of the arc acting as the face for the children of Arkham and provides a bigger challenge for Batman than usual and it's revealed by the end that Penguin was so much harder to catch because his involvement was so personal and he doesn't talk or sell out his partners because of how personal it is for him.
Then Silver St. Could comes back into Bruce's life and plays the role of Vicki Vale as Lady Arkham. Here's my idea Theo plays the villain for the majority of the arc pretending to be Bruce's friend along with Tabitha eventually trying to steal everything from Bruce and taking on the Azrael mantel to fight him until Bruce takes them down but not before getting blindsided by Silver who reveals herself as Theo and Tabitha's partner and another victim of the Wayne's corruption.
I just think that'd be an interesting adaptation and I'd like to see Silver return as Lady Arkham because I think that'd be a punch to the gut betrayal for Bruce in the comics given their history and I think his feelings would be very mixed if his parents were guilty of the things they were in Tell Tale. I'd also like a story line like this because we get so much focus on his "Batman" side we don't really see much of his Bruce side and I really think a story that focus's on Bruce Wayne the man would be very enjoyable especially if the focus of the story was that he was facing an enemy Batman could not defeat like the press, social media, slamming him constantly forcing him to have to be Bruce more to do damage control and I like this idea because depending on how it's done attacking Bruce's image so personally would be a good way to disarm Batman like the board voting to remove him during scandal and the government freezing his assets.
Also the after math alone would be interesting from Bruce reconciling learning his parents did love him but were still criminals to learning how much damage their actions caused. That and it'd be nice to see the Order of Saint Dumas have some attention again like maybe they acted as an or ran an orphanage that took Theo and Tabitha in and served as the driving force behind the Children of Arkham's rage and revenge. That kind of premise would be a good way to bring in new and revamped villains who could be children of Arkham that want revenge on Bruce for what his parents did.