Cthulhu is one of the The Dark Ones, and is perhaps the most famous of these creatures. He was first invented by American Horror author, H.P. Lovecraft.
A Dark One
Cthulhu is one of the Dark Ones who once ruled the earth millennia before mankind came into existence. He, along with the other Dark Ones, was imprisoned in the Mirror Dimension by the first Chosen One. Cthulhu, along with the other Dark Ones, is a master of the Deadites.
Appearances In Evil Dead Media
Army of Darkness Comics (Earth-818793)
Cthulhu makes a cameo in Army of Darkness vs. Re-Animator #4 with his fellow Dark Ones.
Cthulhu also is a major player in Dynamite's Reanimator limited series from 2014. The Reanimator title being a spin-off of the three crossovers between an H.P. Lovecraft creation and the Army of Darkness comics.
Evil Dead 2 Comics
Cthulhu also makes numerous appearances on various covers to the Evil Dead 2 books.