>>85335899Well, no, because even in his own lifetime Lovecraft didn't create all the stuff in his shared universe, and there's been huge amounts of works after his death that explicitly feature "lovecraftian" horrors which did not exist in his personal or shared writings.
>>85338359In the old Marvel continuity at least, Unicron didn't want to rule anything. It wanted to devour everything, because it was literally an old god that had been imprisoned on our plane of existence at the dawn of the universe and spent the rest of time eating chunks of reality, leaving the void empty behind it, searching for the beings created to stop it in order to devour them. It's strongly implied that the cults which worshiped Unicron in that continuity also had a large part in ensuring the constant division and civil war of the Transformers as a planet/race, as they were seen to make attacks on unifying figures.
In a future strand of that same continuity, Unicron is shown to have incredible powers of mental control and to have retained his presence in the Astral Plane - the psychic universe - albeit much reduced from his original power levels, even after the severing of his head. He's capable of enslaving an entire planet and directing them in the presumably incredibly complex work of rebuilding his physical body (escape to the former status of intangible god apparently being impossible).
Unicron in that world doesn't want to be worshiped and simply abuses the minds of lesser beings such that they work toward his goals without even understanding that they're slaves. In the rare cases where it's been shown that they were aware, they're clearly suffering - you know, the madness that Lovecraft liked writing about. I think in that particular continuity Unicron probably does owe a lot to Lovecraft, though I'm less concerned about power levels than you seem to be.