David 8

David, originally manufactured as David-8, is the deuteragonist in the 2012 science fiction film Prometheus (a prequel to the Alien films), and later the main antagonist of its 2017 sequel, Alien: Covenant. Being responsible for using Chemical A0-3959X.91 – 15 to create his batch of Xenomorphs (and possibly the entire Xenomorphs race if not merely recreating Engineers' past experiment that led to creation of either their own versions of Xenomorphs or similar endoparasitoid lifeforms), David is arguably the catalyst behind the events of the series. He can also be considered the protagonist of prequel series of Aliens as it centred on him as he creates Xenomorphs through experiments with A0-3959X.91 – 15 with his own way.