Captain Underpants and the Attack of the Talking Toilets/Appearences

The main characters in this book are:

George Beard Harold Hutchins Captain Underpants Mr. Krupp Characters who first appear in this book are:

Characters from the previous book are:
 * Melvin Sneedly
 * Ms. Anthrope
 * Madison Mancini
 * Donny Shoemyer
 * Freddie Moore
 * The Talking Toilets
 * The Turbo Toilet 2000
 * The Incredible Robo-Plunger
 * Ms. Ribble
 * Mr. Meaner