Board Thread:Speculation House/@comment-25857155-20150116082950

I know there a numerous theories floating around about exactly what Grimm are and where they came from; I have seen many on the forums, but could not find a thread devoted to it, so here it is.

I am rather torn between two of my own theories. The first is that the Grimm are similar to Kingdom Hearts' heartless, and are born from dark emotions in people's hearts. The second is that they were once normal creatures that were the subjects of dust-related experiments millennia past, and they escaped and ran rampant, leading to a world where humans were nearly extinct.

What are your theories? What do you think of mine? I look forward to reading your opinions. 