Stormfly is Astrid/Camicazi dragon,in the book series. She is a mood dragon and her rider is camicazi, rather, in the film she is Astrid's Deadly Nadder.
In the filmEdit
In the film, stormfly is a Deadly Nadder which was shown to be kept locked for dragon training. later she is seen in the battle with the Red Death with astrid as her rider . at the end of the film, Stormfly is flying with astrid , along with the other teens.