Kaijin
怪人
Definition
Literally means "strange person". In the world of tokusatsu, it means a "humanoid monster".
More Information
Trivia: The kanji for kai 怪 is the same in kaiju. Kai by itself means "mystery, suspicious, apparition".
Example
Most of the monsters in Kamen Rider series are kaijin, since they tend to be humanoid.