Xenomorph

Xenomorphs are the overarching antagonists of the "Alien" series. They are an extraterrestrial species born after the host has been impregnated by a parasite known as a "facehugger" where they violently erupt from the host's chest before growing to full size. Usually, they inherit a trait of the host as well (like having a more humanoid body if the host was human.)

All Xenomorphs display very aggressive, instinctual, animalistic behavior but are also stealthy and cunning.

Xenomorphs are (typically) humanoid creatures with black biomechanical looking exoskeletons and tubes sticking out of their backs as well as having long bladed tails. However, the most noteworthy part of their appearance would be their elongated cylindrical skulls with no visible eyes and inner sets of jaws.

Other Xenomorphs and the Xenomorph Queen.

Some basic abilities that Xenomorphs have include their claws, inner jaws, and tail blades though they are also incredibly fast and agile. But their most known power is their acidic blood and saliva.