Nothing against more body types, but BG3's depiction of Githyanki is actually quite close to the official lore across editions.
Like all gith, githyanki were tall and slender humanoids with rough, leathery yellow skin and bright black eyes that were sunken deep in their orbits. They had long and angular skulls, with small and highly placed flat noses, and ears that were pointed and serrated in the back side. They typically grew either red or black hair, which they styled in topknots. Their teeth were pointed.
If anything, other species are maybe a bit too human in terms of behaviour for my taste, but maybe the elves of the Chionthar valley have grown distant from their kin