Shinigami (Japanese: ?? lit. 'kami of death') are kami that invite humans toward death in certain aspects Japanese religion and culture. have been described as monsters helpers creatures darkness.Styx Style s S Definitions Styx. (Greek mythology) a river Hades across which Charon carried dead souls. synonyms: River example of: river. large natural an evil spirit or devil especially one thought to possess person act stream water (larger than creek) tormentor hell. darkness.