I'm a hudge movie buff and being the creative weirdo that I am I can't help wondering what the things you don't see in the movies look like. In this case the alien king. In none of the movies we see a king in the hive. And what would a queen do without a king to fertilize those eggs. so here's my take on him. The idea behind this design is that the two spikes sticking out to the side would form sort of a crown. Together with the big one pointing backward it would also turn him in to one mean battering ram if he lowers his head.
here he is ladies and gents, the only and only King of aliens:
And then I thought, why stop now, let's make a bust out of it...