So Doc, I've been thinking, and I think I've found a new Complete Monster example for the Mega Man series! The villain Ra Moon is pretty much the only candidate I could see qualifying as far as the original classic series is concerned, and he hails from a Japanese only game called Super Adventure Rockman. Since I've watched the game's cutscenes, I'd like to make a proposal for him.
Ra Moon is an ancient alien supercomputer that Dr. Wily finds in a temple underground in South America. Whenever Ra revives Wily's robots from the second and third classic Mega Man games, Ra Moon offers to strengthen an electromagnetic field around the temple which causes technology to go haywire so Wily can use it to dominate the world. It turns out however that Wily was never in control and that Ra Moon was duping him. During the game's climax, Ra Moon reveals that he came to earth 20,000 years before the games took place, and felt disdain for the primal humans and decided that they needed to go. Ra Moon used his abilities as a corruptor and gave humans the capacity for violence, and provided them with the ancient stone tools they'd need to wipe themselves out with. However he grew bored with the violence that he orchestrated and had them construct a temple for him that used to slumber underground before being found in the present by Dr. Wily and fully intends to finish what he started. While Wily thought he was simply holding the planet hostage with the electromagnetic field, Ra was strengthening it so it could shut down all of the planet's technology, kill off all robots, and wipe out humanity by destroying the technology they rely on so much so he can replace the planet's life with his own robots, and decides to kill Mega Man, Wily, and Wily's robot servants before being shut down by Mega Man for good.
I personally think that Ra Moon qualifies. He's an alien A.I, but he's not shown to operate under blue and orange morality, he just hates humans and wants to wipe them off the face of the earth so he can populate it with machines and was willing to use and manipulate Wily in order to further his own agenda. Admittedly, he doesn't understand love as he makes an off-hand remark saying "Love? What is that?" whenever Wily yells that he loves his robots, though I don't feel that it would disqualify him as there are sociopathic Complete Monsters who don't understand love as well (Lord Voldemort comes to mind). Of course though, it's ultimately up to what you think of the matter.
