The Monster Who Lost His Mean by Tiffany Strelitz Haber with illustrations by Kirstie Edmunds is a big hit with elementary school students.
I use it as a springboard to teach basic drawing and watercolor painting techniques. On the final day I have the students
glue the monsters to black construction paper and write a little prompt about what their monster would do if he or she lost their mean. (It’s a fun way to review classroom expectations and good manners.)