[quote=AlienBastard]When you say "human-bug hybrids", do you mean literal hybrids?[/quote]
Background as-planned is that a human computer-controlled seeder-ship (a colony craft which carries sperm and eggs which are grown into colonists on arrival) crashed on a death world, so the computer studied the native fauna and then spliced in useful traits into its human genetic matter, resulting in literal hybrids. Fairly human-like, but with a bunch of bug-like features layered overtop. Think a little bit like genestealers, appearance-wise.

They may or may not also have limited shapeshifting (of the "my arm has just split apart into a mess of teeth and tentacles" type) thanks to a parasitic infection.