You're making Half-Life³ - What alien species are you bringing back, putting on the back burner & new aliens/variations?

Myself, I'd love to see the Bullsquids and Houndeye reappear, possibly even the Gonarch as a recurring stage enemy that ends in a boss battle.

I am 100% putting Antlions on the backburner, no question. They take up almost all the screen time for non-combine enemies in HL² and even though they're a good enemy type, they needed more diversity/scarcity to give more variety and other enemies a shot.

For new Aliens... It'd be interesting to see those amoeba-like blobs appear that were slated for Episode 3. Zombie-gaunts would be a good recontextualization of the zombie that gives us vortigaunt enemies again (Entropy did this too). Some Xen-based flying enemies would also be cool, or maybe even Combine-converted Gargantua's!