Thanks to all those who participated in my NaNoWriMo poll!
I got a range of votes, including the excellent write-in for “goblins” (really great idea!), but one thing really surprised me: The option “Don’t write a sequel to the book you haven’t sold yet.” got 0% of the votes.
I have a confession: That was really the question I was struggling to answer. My first book, Undead Rising, is still out with an agent. It’s been six months; I’m sending her an email next week to let her know I’m going to start sending it to other people. Everyone who has read that book has LOVED it, but the non-responses I’ve gotten from agents were deeply dispiriting, and I felt like maybe it wasn’t a good enough idea.
But everybody thought it was a good idea to keep writing gamebooks/interactive novels/monster stories. I’m floored, and uplifted (is that a contradiction? I don’t care.).
I’m grateful so many folks weighed in.
The winner: Pirates!
Which is super, because that’s a really ripe genre I can rob, and let’s be honest, I need a lot of material from which to plunder.
(Plunder. See what I did there? Brace for a whole passel of puns in this book, my friends!)
Yo-ho-ho, away we go!
M.E. Kinkade 
But… pirate isn’t a monster type, it’s a profession. Anyone who commits armed robbery with a boat is a pirate.
Flexible definitions, Misha. But I have tucked your goblin suggestion in the back of my mind, so maybe by the time I’m ready to write again it’ll be full-fledged.