Created species are species which were created due in some part thanks to the efforts of a sapient alien race's intervention. This may include things such as constructs (such as the Transformers, Geth, or other robots), experiments such as the Mutant Rancor, accidental mutations due to war like the Scantid, and various other possible origins. In most cases in creation of a new species is often unpredictable; most often when a new species is created they become more aggressive and more dangerous than any natural lifeform in any universe (such as the Majin - at least its most well known individual).

Queen Mother

Bodyburster

Carrier Xenomorph

Zerg

Metroid

Cybermen

Majin

Galvanic Mechamorph