Dr_Dred
He may become the Emperor of Mankind, but he is a parliamentary authority to some extent Feudal empires are a weak and unjust nation It is better for him to become emperor of humanity, but he has limits to his power and there is democracy, council and parliament, so this is a good thing. Also, so that he does not become a power-hungry tyrant in the eyes of the people
I mean if you will introduce more universes in the future I would say mabe creating a council while he is the Supreme leader but it is a voted position. but with his use of the media I would say he would manipulate and tweak so he never loses office. mabe you could throw in plot twists where he loses his position after going some where/being trapped on halo or a shield world and while away assumed dead or something? then coming back and re inserting himself into the position