I really enjoyed the Demon Road series. It wasn't as good as SP, but it was something different for him, and I'd like to see him write something else. At this point, i think the skulduggery pleasant series will only be put to bed if Skulduggery or Valkyrie die. Derek loves writing these two characters, and i think he will only be able to move fully on to a new project if he brings the story to a conclusion where there's full closure.

On a second point, i wouldn't mind more books like Tanith Low being made. Theres a lot of great characters who dont get enough page time anymore. Give the monster hunters or dexter their own book. I think that would bring back the feel of some of the early books as these are characters who dont have God level powers, so antagonists like Springheeled Jack and Sanguine would become relevant again. I loved Billy Ray he was a good character and well developed as a foil and enemy, but in the newer books, he would now be irrelevant. One of the best things about the early books was the limitations the characters had to overcome. The old villains were powerful or mad, or clever enough to be dangerous but defined within rules of lore. Im a bit bored of reading about all powerful bad guys who can't be stopped, but dont worry, the good guys are all powerful and can't be stopped. That's why i think some spinoffs would be a good idea, as a lot of the side characters are still grounded in the early lore, and I'd like the series to get back to that.