FYI, the DM Guild product Heroes of the Mists has a "dread gargoyle" PC race that is pretty clearly inspired by Disney's Gargoyles (though it's also positioned as a Ravenloft-themed replacement for dragonborn). I modified it further for our homebrew campaign world, making it more Disney and less dragonborn, and would be happy to share it with you directly. (No stone sleep, but I kinda sorta nod to it in an optional racial feat.)Mine would be gargoyles ala Disney's. I don't think it would be so hard either, with gliding, inactive night mode, climb speed, claws and some superstrength abilities like carry strength or a knockback ability.
The Traders, from GURPS Aliens. They had ships that were bigger on the inside and had decided they were all named Joe. (Yes, a race of Trader Joes)I dunno if I saw it as a GURPS alien species or some other RPG's or one of those famous alien catalog books. But an alien species that had a slick almost serpent like shape but was hard to pin down because large parts of it would slip in and out of higher dimensions. You only ever saw a weird 3d slice of a higher dimensional form.
I wan't an lineage like that, but fantasy, or spelljammer, maybe it has parts that fade into and out of many other planes of existince.