As for continuing 66? After Batgirl, and the lead Rogues are done...
Joker, Riddler, Penguin, Catwoman (confirmed).
I would add Freeze(Otto Preminger), and unlikely but False-Face(Malachi Throne).
While others were more preposterous, those two really terrified me as a kid.
Already mentioned I'd love spin-off Green Hornet & Kato
I am glad to see Mars doing this. I wonder if they will ever do a CIVILIAN Burt Ward and Adam West (Dick Grayson and Bruce Wayne)?
Not sure how much I would get into Civilian ID's at this scale?
Wayne and Grayson would be great, it would likely follow I would then need Alfred too, though I would draw the line before Aunt Harriet.
Is that a store selling Batman merchandise behind them?
If doing an Adam West likeness, and Mars wants to further co-opt another neglected license.
I would want Mars' take on 90s Zorro and Henry Wayne, the implied great, great, ancestor of Bruce Wayne. A genious inventor tasked with capturing Zorro.
De La Vega (Zorro) is so impressed with him, that he suggest why not use his skills and inventions for good.... Presumably passing down and inspiring his descendant. Making it unofficially a 66 shared universe continuity,
1920
1943 reimagined for the first Batman movie (which Kane was consultant on)