The Joker? Hey, that wouldn't be a half-bad starting point.
What about a serious "Joker"?
That is, a character who believes in the chaos and randomness of life and chooses to share with the world, through serial killing. Like some sort of half-genius who understand the mathematics of Chaos Theory, but misunderstands the principles behind it. Perhaps this character wants to be a cosmic horror? And is attempting to bring the universe into a state chaotic enough to allow that to happen? Or maybe they claim to have been a cosmic horror, and perhaps they know more about the world, and how to effect it, than the heroes belive? Madman, or Only Sane Man?
Then, you've got to answer the question, what does this Matthew know about the killer that he isn't saying? A cosmic horror himself? Or something worse?
edited 29th May '11 2:05:47 AM by DudemanThingface