Well, I would say deciding what changes and what doesn't.

In my Edwardian AU, Bruce is still the Prince of Gotham, has the same history, etc. Bruce isn't quite as driven as 'our' Bruce but is still manipulative.

Dick is a different story. While he still tragically loses his parents he becomes a ballet dancer in Europe before he comes to America with Bruce. Dick is more guarded in this AU but still comes across as a sunny personality. 😍

Aren't sisters the best? ☺️