Rat is the hunchbacked henchman of Dr Zalost . His only appearance is in The Tower of Dr. Zalost.
He is cold and villainously calculating, even without the ability to speak. Finances and results are his top priority, so Dr. Zalost's fragile emotional state is often an obstacle of his. He is mistreated by his master, causing a build up of repressed anger that is unleashed when he is hit by one of Zalost's cannon balls. As a baby, he became much more in touch with his emotions, and likes hugs.