Question: Are you willing to believe that Bob is real?
Sure, whether he is a flesh and blood person or a person made up in your mind- then he is real. He is either real or a character in your mind that has been told to others, and each person who hears about him have them in their minds as well.
Think about it- Bugs Bunny isn't real rabbit but he does exist in cartoons that were drawn. The same would be for anything else.