In the How to Train Your Dragon book series, several minor and major characters are in the Pirate Training Program. There is a total of twelve vikings that are consistently mentioned as being part of this program. The only exception is the first book, where only ten vikings were mentioned, although it can be argued that these ten vikings were part of the Dragon Initiation Program and not the Pirate Training Program, as the latter wasn't mentioned at all in the first book. They are: They are all characters from the book, but they aren't mentioned very much.