simonsoys:

I think it’s more of the idea that “here’s a human that doesn’t hate us and that we didn’t kill! Look, we can be friends!” Asgore probably does the heavy political stuff. Frisk’s just there to keep everyone in the room from screaming when they see Asgore.

I figured Frisk’s biggest role was helping to “translate” human concepts to monsters on their way to the surface. There’s going to be a lot that monsters don’t know about. It’s good for them to have a human that they trust who can say things like “don’t freak out guys but this is what we call thunder and lightning,” “don’t greet humans with magic, that hurts us,” and “this is a toilet.”

Ambassadors don’t really make the policies, they’re just the go-between to represent their countries and culture. Frisk’s job might actually be more or less “done” after the initial transition to the surface.