Here's my submission for the Dreamworks' and Deviantart's How to Train Your Dragon: Discover Your Duo contest!
I picked Cloudjumper and Valka's Bewilderbeast as my favorite duo because I really liked how their relationship was built around mutual respect. As alpha, Valka's Bewilderbeast acted as a gentle protector to all dragons and I think Cloudjumper recognized this and was more than happy to be his second-in-command and friend. They are also my two favorite dragons, both in design and story in the series (besides Toothless of course!) and all the scenes they had together were really heartwarming and epic!
I hope you enjoy!