Whirlwind is an air dragon with unicorn ancestry – two species that could not be more opposite in nature, which made her never quite fit in with either group. Other dragons were envious of her beauty, while unicorns shunned her for her ability to fly. But Whirlwind found peace within the dark and stormy clouds, where she learned to harness the tempest power within her. Despite her turbulent youth, she was the first to defend both dragons and unicorns when the trolls began hunting them, unleashing her ferocity in a brilliant and powerful rainbow that could be seen throughout many regions of Skylands. From that day forward, evil-doers would quake when dark clouds brewed, and run from the rainbow that followed the storm.
Whirlwind - Crystal Clear may be the rarest of all Skylander variants. She was first found on ebay in November of 2013. That's two years after the release of Spyro's Adventure, and this is a Series 1 Whirlwind not one of the newer versions. It turns out that she is an ultra rare character that is randomly appearing in Germany and the UK when customers buy an LG Smart TV. Apparently they have made a special edition of Skylanders Battlegrounds for these LG TVs and they come with a free Skylanders Starter pack containing three random single characters. You can check out the promotion here: Sometimes these characters contain the Whirlwind - Crystal Clear or the equally hard to find Camo - Red.
Other crystal variants include: Wham-Shell - Crystal Clear, Stealth Elf - Crystal Clear and Cynder - Crystal Clear.