Gnaw, known as Growl in the PAL version, is a large, imposing creature that is purple in color, with blue spots covering its body, several rows of sharp teeth, and some retractable spikes on its head (which do not actually deal any damage to Mario or Princess Peach if they jump on them). Gnaw is also immune to any form of physical harm, making it unable to be defeated.
Gnaw is Merlee's favorite pet, which she uses to guard her mansion. In Super Paper Mario, when Mimi takes over Merlee's Mansion, she chains the Gnaw to a door, making it incapable of attacking her. If Mario or Princess Peach approach Gnaw, it tries to grab them in its mouth; if successful, Gnaw gives its catch to some Gnips, who proceed to throw them out of Merlee's Mansion. The reason it does this is to ensure that Mario and Peach do not get hurt by Mimi, as it knew Mimi was evil, whereas the heroes were fooled into thinking she was Merlee's maid.
When Mario or Princess Peach manage to obtain a hidden key in Merlee's Mansion, they need to sneak by Gnaw and use it on a nearby door. Unlocking the door also frees Gnaw, who proceeds to chase a nearby Mimi all throughout Merlee's Mansion (a reference to how the similarly dog-like Chain Chomps chased away Tutankoopa, the Chapter 2 boss of the first Paper Mario). It is not seen again after this.
Names in other languages