The Demonata/WMG

The Demonata and the saga of Darren Shan share the same universe.
Ok I like to think that Darren Shan's two series share the same universe. This would mean that Mr Tiny is a demon possibly a Demon Master. The Wolf Man is a werewolf like in the Demonata and that bit in the last book s well. Or maybe.
 * In one of the Cirque du Freak books (I can't remember which), Evanna explains to Darren that she and Mr. Tiny can't use their powers to great extent without screwing up the universe in a way that, it's implied, will let demons loose into the world. If anyone can find the exact passage, they'll have my gratitude.