Lovecraft was a horror writer:
- He wrote about the True Faeries, as the Old Ones.
- At the time of World War I, a man, stranded on the sea after a German sea raid, eventually found himself on an island in the South Pacific, inhabited by fishmen who worshiped Dagon and offered him sacrifices in the form of fish and drowned men. He witnessed the horrible sacrificial ceremony and by the coming of Dagon, and was subsequently rendered insane by the experience. The man managed to flee the island and found himself in San Francisco, where he tried to learn more about what he had seen, and wrote down his story, until he was found back by the fishmen. That story was later published by H.P. Lovecraft, with the man as narrator, under the title "Dagon".
Although some of Lovecraft's subject actually exist in Earth-616, his works are presented as fiction. Myrna Lukaikas possessed a book by (or about) "HPL", as part of her collection on occult matters, as did Doctor Strange.
- Howard Phillips Lovecraft (1890-1937) was a writer of horror and weird fiction, and the central author of the Cthulhu Mythos.
- It is established that Lovecraft existed in Earth-616, and that he wrote similar works than "our reality"'s Lovecraft, on beings (at least the True Faeries) that existed in Earth-616. It isn't revealed as far how he came in knowledge of those creatures, or if other H.P. Lovecraft's material in the Marvel Universe were also documented by his Earth-616 counterpart.
- Lovecraft is himself a character within the Mythos: He was mentioned in the stories "Beyond the Treshold" (1941) and "The Dweller in Darkness" by August Derleth, "The Shadow From the Steeple" (September, 1950) by Robert Bloch, and "The Terror from the Depths" (1976) by Fritz Leiber, among others, as an author existing within the Mythos' universe.
- Robert Bloch wrote "The Shambler From the Stars" (September, 1935), adapted in Journey Into Mystery (Vol. 2) #3 (February, 1973), in which he had a reclusive scholar living in Providence, based on Lovecraft, killed.
- Lovecraft replied with "The Haunter of the Dark" (December, 1936), adapted in Journey Into Mystery (Vol. 2) #4 (April, 1973) in which Robert Blake, based on Robert Bloch, was killed as well.
- Robert wrote a third sequence, "The Shadow From the Steeple" (September, 1950), in which Howard Phillips Lovecraft appeared, and died. The story was adapted in Journey Into Mystery (Vol. 2) #5 (June, 1973), in which this character was named Howard Phillips instead.
- Lovecraft name is used as an adjective, "Lovecraftian", to describe eldritch horrors.
- When Carnage (Cletus Kasady) attempted to prove that history and the body counts of its wars was the definition of civilization, and that history was "just a story told by whoever clawed their way to the top of the carnage", he mentioned himself, Lovecraft and Manson.