“Cloudjumper was designed to be surprising. We knew that we would have scenes in which Toothless and he would fly together, so we were looking for a bold statement to help differentiate them, even at a distance. I liked the idea of two sets of wings that form an X in the sky. They could be stowed into one another so as to create a surprise reveal.

"Personality-wise we thought of Cloudjumper as a bit of an elitist within the Arctic dragon colony – Valka’s chosen one – and somewhat stuffy and mature to contrast with Toothless’ youthful energy and ignorance of rank. His animal references are a Great Dane mixed with an owl. It makes for a unique and interesting dragon.”

– Dean DeBlois, director of How to Train Your Dragon 2

Via: The Art of How to Train Your Dragon 2