Given the nature of shapeshifting and infinite shadow, if the producers feel that they have a diversity quota gun to their head, why not have characters with multiple appearances including gender?
I kinda enjoy idea of Amberites look and trappings shifting from Shadow to Shadow to fit in, not cause sort of Paradox.
With Chaosites - sure full shapeshifting. Let it roll.
Within the fictional universe, Oberon was a shape-shifter. So the full siblings should have a little more similarity since their mothers were not shape-shifters, but there's room for a wide variety.
On the other hand, if they stick with all-white Amberite characters - that means that all peoples of every reality are lesser reflections of this white family. That is true to the 1970s books, but particularly when it is presented in a visual medium, I think it will be uncomfortable for many viewers today.
I wonder about how I'd approach it. I think the cultural portrayal of Amber is one of the weaker sides of the books' concept. All realities are a reflection of a generic-seeming English castle with its family stepping out of Shakespeare? It fit with fantasy standards of the 1970s, but it isn't very interesting for a visual medium.
I mean yes... but not. Thing is Courts of Chaos were natural Axis of Creation, Amber was made later, artificially by Dworkin, his little personal utopia.
It brings multiverse to certain order depending on how given shadow places between Amber and Courts, but it's not like all in them is impression of Amber, most of things on Earth can be just element of original infinite diversity that existed before Pattern.
I'd want Amber to be more fantastical, with impossible and wacky mixed architecture that looks amazing and weird - like the Taj Mahal, Versaille and Chichen Itza put together with magic - giving more believable that the roots of all the variety of reality is from there.
But that's chaos. Infinite varieties mixed together. That's how Courts should look like.
Every time I see someone dismiss a style or concept as old fashioned, and in need of 'updating,' I always think "according to whom?"
I'd say it's less "updating" but also examining setting own coherence. And here honestly if making adaptation I'd notice glaring holes, then I would shift it to make it more coherent and fans can burn in hell with their plotholes
Alas I believe jhkim is wrong in this regard, because Amber is not source of all creation - Courts are, and Courts and Logrus, and multiverse existed millenia before Dworkin forged Amber like a new Axis for Shadows. So it makes sense to make Amber very uniform, and Chaos very diverse. It's not after all like Chaosians are really bad guys.