Originality in writing is hard to define, as there is very little truly original in any story or character. Everything we write, every character has been written before. I'm certain that even those stories that were first written down were based on oral tales, and those tales were based on events lived by someone in the far distant past many, many generations ago.
So how can we be original? We can't. Listen to the words of two masters.
Stop worrying about originality. Just write your story.