[quote=@Double]
My question involves a digimon partner. I'd like an original but may need some help designing the various stages. Generally I want it to follow a Fox or Racoon mixed with a Gentleman/Phantom Thief theme. I'm not really sure if such a line already exists, my memory of the Digimon bestiary is pretty fuzzy. Basically I'll just be a disillusioned Digidestined that sort of went rogue after the apocalypse, and will likely take some convincing to play hero again.
[/quote]

The Youkomon line is probably the closest to what you're after in the canon.