Stormfly is a fictional dragon from the animated film series How to Train Your Dragon. She is a Deadly Nadder, known for her striking blue and green scales, as well as her sharp spines and agility in flight. Stormfly is the loyal companion of Astrid Hofferson, one of the main characters in the series. In the story, Stormfly showcases her intelligence and bravery, often assisting Astrid in battles and adventures. Her ability to breathe fire and her quick reflexes make her a formidable ally. Together, they demonstrate the strong bond between humans and dragons in the Berk community.