Here's the silly story of where my pen name came from. E and B are the initials of my first and last name. I chose "black" because I write dark literature and also because at one of the writers groups I joined, the leader said that whenever she looked at me out of the corner of her eyes, she saw me as a gothic with all black clothing, skull earrings, and a cross necklace. She said I had a gothic aura.
While I don't think that encompasses me completely, I do think it describes a certain part of me that I express often in my writing.