Kaijin are the smaller (Human sized in fact) versions of the Dai Kaiju. These normal sized monsters have been Japan's favourite villains since Gekko Kamen first aired in 1958. These creatures mostly fall under the ''Monster of the Week'' category .
These monsters look more human like compared to Dai Kaiju, They come in a wide variety of types. Other then being just monsters and aliens, a popular concept was introduced in the first Kamen Rider was the ''re-modeled human'' which involves totally changing humans in to super powered assassins by extensive operations. other types are: Magic induced humans Magical creatures that have an ancient history Ancient highly advanced humans that have found a way of evolving by becoming monsters Aliens from outer space or other dimensions Humans using technology to change into monsters Angels Robots Cyborgs The suits designs have become increasingly more complex over the years.