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I recommend making the goblin far more diverse. Possibly as a template to add to other species. Having examined the historical rise of the goblin and the larger family tree it belongs to, its ability to crossbreed with other races and animal species is its most defining aspect.
The Ku family tree
Subterranean Ku branch into kobolt and gobelin. Kobolt breed with gobelin to produce gremlin (converging gobelin's invisibility and kobolt's ill luck). Kobolt give rise to kobold. Gobelin produce goblin. Goblin breed with the hob (elf ancestor) to produce hobgoblins. Forest dwelling Goblins breed with bears to produce bugbears, fens dwelling goblins breed with ponies to produce pooka, plains dwelling goblin breed with dogs to produce barghest, cave dwelling goblins breed with kobolds to produce knockers.