Reshie! We've seen the power of dragons many times throughout regions, and the fearsome behemoths of Unova are no exception. Yet While Hydreigon, Zekrom, Druddigon, Kyurem, Haxorus look cool, deadly and inspire strength, Reshiram inspires beauty. Reshiram is an almost holy figure, a creature of white light with blue, sky-like, standing for nothing but truth. He's by far Unova's most unique dragon.
I don't think there's ever been a dragon really like this in any generation. Cute maybe like Dragonite or Goodra, but with Reshiram's noble, heavenly beauty? I'd say Reshiram's in a class apart.