I've heard here that the after TiTS the plan is for the next game to not focus on transformations at all. Not sure how valid this claim is but without the transformation aspect their games are extremely bland.
I've honestly given it thought and think that's a good idea, hear me out!
>You limit the PC to only a hand full (5 or 6 transformations, 6 or so traits that have an interaction with narrative, then 10 characteristics for personality expression) of dials for the player to tweak but give those dials loads of content for interactivity.
>The PC is a character on their own with their own history but how they express themselves is dependent on the player, think Harry from Disco Elysium or Shepard from Mass Effect. Makes writing for them less of an ordeal for them since they can't get a self insert right like the Courier (Fallout New Vegas).
There's a lot more rolling around in my noggin but thats just where I'd start with a new game.