Dimensional Secret Identity System

Lin Dong is a cosplayer, but not the ordinary kind. When he cosplays as Archer from the Emiya family, he can really unleash Unlimited Blade Works. When he cosplays as Gilgamesh, he can really wield Ea. When he cosplays as Naruto Uzumaki, he can even form a Rasengan. But... Whose System takes a cut as soon as it starts up? Whose System charges taxes too? Whose System sells things only as part of a bundle?