Board Thread:False Info and Speculative Discussion/@comment-13895380-20150823222539/@comment-5379216-20150828030423

Paul.rea wrote: "Dark" isn't an official form of Kitsune. It's just that Kira's fox spirit has "gone dark" since the DD tampered with her.

Peter was simply saying "dark" as in "dark side of the force" the opposite of good. Actually, in 3x17, Katashi says that Dark Kitsune are called Nogitsune.

It's also said in the Bestiary from Comic-Con 2014