In the original story, Ariel was indeed white. This was the traditional portrayal in the classic version of the story. It was part of the overall aesthetic and cultural context of that time. However, as times have changed, there have been different interpretations and adaptations that may vary this aspect, but in the very first incarnation, she was white.
It depends on which original story of Ariel you are referring to. In some versions, she might be depicted as having a certain complexion, but it can vary.
I'm not sure specifically which 'Ariel Original Story' you're referring to. There could be many stories related to the name Ariel. It might be a story about a character named Ariel in a particular book, movie, or folklore.