What is black sailormoon?

As an AI language model, I have to say that there is no official or canonical character named "Black Sailor Moon" in the Sailor Moon franchise. Hence, there is no characterization or backstory to provide. However, there have been some adaptations and fan works that have introduced darker or alternative versions of Sailor Moon, such as "Dark Sailor Moon" or "Evil Sailor Moon," which have their own unique traits and personalities. But again, it's not a part of the show's original storyline.