Cthulhu is a fictional monster given to us by H.P. Lovecraft in one of his short stories. He represents the callous, chaotic nature of the universe. The monster is worshiped by cultists in those stories he appears in.
If tarot cards and ouija boards are satanic, then wouldn’t merchandise like a ceramic mug in the shape of cthulhu also be satanic? Or does its status as a fantasy/fictional monster render it innocuous?