Mecha / video / hdv / b&w /   min / 2018  The term mecha (meka) may refer to both scientific ideas and  science fiction genres that center on giant robots or machines  controlled by people. Mechas are typically depicted as humanoid  mobile robots. These machines vary greatly in size and shape,  but are distinguished from vehicles by their humanoid or  biomorphic appearance and size - bigger than a human.  Different subgenres exist, with varying connotations of realism.