cthulhu is a fictional deity created by the horror writer h. p. lovecraft. cthulhu is a powerful monster from another planet. it (cthulhu is neither male nor female) is very ancient compared to humans, being around since the dinosaurs. it has the alien appearance of a large green dragon with the head of an octopus and human-like hands. there are said to be many people who worship it as their deity because of their powers over the mind.