Tsuki was always fascinating by dragons. these gaint creatures that could breathe hot fire! even though he was fascinated by them he never feared them. His father gave him something on his tenth birthday that he still reads at 17. apparently his ancestors all the way back when they were vikings used to ride dragons. although there just myths and story's Tsuki loved reading about them. but one dragon he always came back too... the Nightfury. So when Tasuki was pushed off a roof and killed by a bully and he was given the chance to go to another world with one power... it was obvious. a Nightfury symbolized freedom and power in his mind... so that was what he wanted to become.