Death, being a being of four-dimensions who can also break the fourth-wall, recognizes that Richter is the main character of this whole universe. If he disappears, what does that mean for the universe?

Probably nothing. We've gone whole arcs without Richter showing up.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.