Planescape has always struck me as a kind of funny evolution from standard D&D, especially in regards to the races. Of course humans, the Gith, Planetouched, some of the rarer humanoids from across the planes, and your given Rogue Modron are all pretty indispensable to the setting.
However, after those just how important are the various kinds of regular D&D races to Planescape? If we remove dwarves, elves, halflings, gnomes and the various demi-humans from the setting would anyone really notice?
I ask because I'm beginning to plan a Planescape via Fate game and am pondering leaving out the less planar-themed races. Would I be missing anything too drastic?
I'm not even sure why you need humans? Because a few factols are of that lesser, belligerent race?
Seriously though, leaving out some of the demihumans may shift things in terms of planar politics given the prominence of those races' deities in certain aspects of planar interaction.
It may also make Sigil feel less like a cosmopolitan fantasy rather than a galactic hub. Having the archetypal fantasy races with varied cultures/religions/fashions/temperaments is a nice way to get across the potential diversity of the planes.
That said I think you can pretty much cut out a lot of races from Planescape without too much trouble as there's an infinity out there to make up the difference.
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