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 his powers over the mind.