I love doing a monster unit for Halloween. Here are some of my favorite read-alouds:
Leonardo is terrible at being a monster. He's not scary at all. A great story by Mo Willems.
Love this book about sorting your emotions.
A re-write of several different fairy tales including Princess and the Pea with monsters.
Love using this book to compare monster families to our families.
Monsters don't say "I love you"-they say "I loathe you". I read this story and then have the kids write about what another creature might say to express their love for one another.
He thinks his teacher is a monster until a very human moment happens when they run into each other outside of school. My students have a hard time with metaphor, so this is a great way to introduce it.
I remember reading this book as a child. I like when I can get excited and do different voices.