I second the fraymotifs thing (@rinshn) cuz yeah it would be kickass.

fortunately, the lack of known or named combinations of aspects means that every homestuck fan trying to make some homestuck fangame can just bullshit up their own fraymotifs (oh gog imagine a homestuck hero shooter and the fraymotifs are like team-ups in Marvel Rivals)

Also @mithrifer re: grist hordes. I haven't touched the end of Homestuck really since I read it for the first time (besides rewatching collide repeatedly) but IIRC, every denizen has, like, a game-spoilingly massive horde of grist, so I imagine Derse provides the underlings, the underlings go to the lands, and then the denizens of each land give their protective little mischief-making imps and slime monsters little bits of the fat stash. (Imagine the denizen as the parent giving their underling children an allowance of grist to use).

As for where grist comes from and how it's made, since all the grists are different materials, I imagine they're the Incipisphere's equivalent of naturally occurring elements. It's a boring answer but yeah grist types = periodic table makes about as much sense as any explanation you could give to grist existing and I think it fits the whole "creating a new universe" shtick of the game.

Also I completely forgot that the Omega kids were all naturally born, despite having read (and re-read) all of BC. I just regularly forget that lmao. Although that raises an only-slightly-related question: does everyone to ever live have a dreamself? Or just those destined to play the game? Dammit, Barack. Once again throwing everything into question with your holographic appearance at the end of the Candy route (they really just gloss over Obama convincing C.Dave to kill himself beside M.Karkat pointing out the ridiculousness of it, don't they?).