The Demonata/WMG
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 where there are those monsters in Mr Tiny's place they are demons as well. Or maybe seeing as the whole universe was recreated at the end of the Demonata and in the new universe is the saga of darren shan's universe and Lord Loss and Mr Tiny are one and the same.
- 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.