Cookie is one of Holly’s closest friends in the fantasy world. The giant green troll lives in the Griffin Hatchery on the island of Magora and takes care of Villa Nonesuch, a living tree house that becomes the home of Holly and her friends.

Besides training baby griffins to fly, Cookie is a surrogate father to Holly especially. He is emotional to an extent that seems outrageous at times, and he shows this through a special talent. Cookie is not only a troll but a shape-shifter too. Within seconds he can change from a mouse into a giant dragon, and he uses every opportunity to display his feelings that way—to the annoyance of the people around him.

But Cookie has some secrets of his own that Holly learns over time.