Charon's Links
Charon is helping Pluto track down 'The Count' not out of any moral conviction or a loyalty to the former god, but as a way to potentially become one themselves. Even if they don't think the Count is a treat or even real, they do know about the power that Pluto possesses, and plan to manipulate that for their own ends.
From the moment that Charon pulled him out of the wreakage of his former kingdom, Pluto has felt a deep personal connection to them. He looks to them as his other half, confessing things he would never to anyone else. Just Charon. He knows that they always were meant to find eachother, that they are each the other's lost half.