Jenova

An extraterrestrial entity arrived on Earth millennia ago, causing immense damage and infecting the ancient Cetra with her cells, transforming them into monstrous beings. After being subdued and killed by the remaining Cetra, Jenova's cells possess the potential to grant power when injected into humans. Members of SOLDIER were infused with these cells. While she initially appeared as a blue and purple-skinned woman, Jenova has the ability to shapeshift, frequently taking the form of Sephiroth.