He who walks behind the rows is basically
the god of the corn. he was said to be a native American god that
seeks vengeance for the wrongs done to the earth. And what he looks
like....Stephen king himself described He who walks behind the rows
as some titanic green creature with red eyes 'the size of footballs'
yet in the movies we see it primarily as a moving mound of earth
that devours anyone caught up in it. however we also know that this
god can possess individuals, appearing as Gabriel in part 6, and
possessing the cult leaders in other movies.
And what of his weaknesses's....well the term
'fire' rapidly springs to mind as it seems he is destroyed on more
than one occasion by this element.....