- alchemy class: Class of omnivores that can eat and emulate all materials. These beings are able to synthesize chemical effects so you can change body set up based on their research.
We got -1 penalties to stomachs that could turn anything into nutritional slurry. Even with the experience gained through our failure, being able to produce arbitrary substances is not going to be viable (without a lot more experience)
- Simulatrix - a much smaller class of innocent looking bugs that try to learn of the human culture
Spies? Could be worth it. Certainly worth keeping in mind.
- Spitting infector: these spitting soldiers spit their eggs at their enemies. Unattended contact will result in death for the human. A parasitic human sized bug with sharp claws breaks out of the human.
A classic, obviously. But one really more suited to horror movies than open combat- by the time the parasite bursts forth, the battle will be long over.
- Domesticator: A worker bug with a whipslash whiskers. Able to speak human. Used to domesticate prisoners.
Hmm. I mean, yeah, they have human slaves, why can't we? But... why bother? We are biologically superior to humans- only their knowledge prevents us from claiming our birthright. And it is hard to get unwilling subjects to create technologically advanced weapons for you.
They just end up building robot suits instead. Which is to say, I doubt we would get slaves that are good for anything more than menial labour/combat. And since they need to eat as well, they'd consume manpower just like Workers do- Workers who are in every way (that matters) superior*
*I'm assuming that Workers are better in combat than Slaves. Certainly sounds that way from their descriptions.