Toothless ('How to Train Your Dragon')

This mysterious Night Fury, most feared of all dragons, ends up being the best friend and fiercest defender a boy (Viking or otherwise) ever had. We mean no disrespect to the family cat or dog, but Toothless is pretty much the most kick-ass pet ever. Can Fido singlehandedly take down a dragon ten times his size and then frolic like a kitten? Probably not.