Post the most awesomest video game creatures here!
I'll start off with the aliens from the Halo series, one of my favorite games for the aliens alone!

The San'Shyuum, or the Prophets, are the leaders of the Covenant, the main bad-guy organization in the games. Only one ever enters a combat role. They have cool little floating chair things.

The Sangheili, or the Elites, form the military backbone of the Covenant. They have four jaws, like the Predator, but you can't really see that with their robot armor.

The Elites got kicked out of the Covenant eventually and were replaced by the faily boring monkey-aliens, the Jiralhanae, or Brutes.

Now we get into the interesting stuff. This is a Huragok, or Engineer. They are artificial life forms that don't fight; they just fix stuff. They reproduce by getting together and
building their child.

My favorite Halo alien, the Mgalekgolo, or Hunters, are collectively sentient colonies of worms inside mechanical armor.

The Yanme'e, or Drones. They're bug-men. They fly. They have a hive mind. Their name is derived from the Japanese
yanma (dragonfly). They're badass mofos.

The Kig-Yar, or Jackals. Creepy-as-fuck bird-lizard-men things. They're usually snipers or scouts.

The Unggoy (which is the Tagalog word for "monkey"), or Grunts. They're supposedy
arthropods, although they look more like...mutant cynodonts or something. They're the comic-relief aliens and I love them. "Leader dead, ru away!"

This is a non-Covenant alien, the Flood. The Flood is an extragalactic collectively sentient parasitoid fungus that conumes sentient lifeforms. I FUCKING HATE IT.