Humans: The all rounders capable of both exceeding and failing to meet up to expectations at the same time.
Hybrids:Take the capabilities of humanity and times it by two.
Sectoids:Even though this species is extremely weak physically they more than make up for it with their psionic capabilities.
Vipers:A race of snake people with extremely fast reflexes.
Mutons:Big brutes who tend to have more muscles than brains.
Archons:Once commanders in the elders army now a species of wise men that travel the world.
Robotic species:
Specter:Born from vats of meld that gained a form of sentients.
Codex:Bound to the remains of the now defunct psionic network, sightings are few and far between.
Sentients in hiding:
Andromedon:Sticking around abandoned ADVENT factories and other alien Black Sites.
Faceless:Still hiding in civilian populations around the country sides.
Non Sentient species:
Chryssalids:Worse than cockroaches
Lost: zombies