I know so far that he's one of the faces of The Baron(or Bawon) Samedi and that Baron Kriminel works for pay.
Things I tried to Goolge: Baron Kriminel, Baron Krimminel, Baron Samedi, Baron Criminel and all of those, but in quotation marks. I checked out Answers.com, Dogpile (search engine), Wikipedia and Google (duh..) and I still got next to nothing.
I don't want to know how to call him in ritual ceremony, just what he represents, why a Haitian would strike a deal with him and how... the like. Any and all help is appreciated ^.^