Godzilla is a Kaiju and all of the Godzilla films are part of the Kaiju genre. The 1954 film “Gojira” is considered to have been the first mainstream Kaiju film and popularized the genre. ... The Godzilla films feature many different Kaiju, including Ghidorah, Mothra, Rodan, Anguirus, and Gigan. Mousepad!