For your LU/SU au, how about making Warriors a Hessonite, since their purpose is to comand armies, and he's a military captain? And Twilight, being the buffest of them all, could be a quartz, perhaps a smoky quartz (the non-fusion kind). He would have his gem on the forehead, where the twilight shard was in-game. Legend could be a moonstone, because in Asia and meso-america, the moon is connected to rabbits, and he uses a moon pearl to transform.
I like those ideas ! Some of them are already canon for this AU, good guess 👀
I finally got the bois' gem types figured out so most of them I won't change but thanks a lot for the suggestions ! Even if they don't directly affect the story it still helps me get more in depth with what I've already written down ! Have a good day !