What's in a Name?

There is a famous fictional character called Sherlock Holmes. If you discovered that there was a real Victorian detective called Sherlock Holmes who lived in London, then that might be the same person (perhaps the stories were not fictional), but if you met a detective called Sherlock Holmes who lived in London then he would definitely not be the same person, because he would not be fictional. Would it matter whether he was made of 10-dimensional string or not? No. Would it matter if he was made by God, out of whatever God would have made him out of? No, how could it matter what he was made of? Now, if you saw a movie about Sherlock Holmes, then that character could well be the same fictional character, even if the character in the movie was not exactly the same as the character in the books. But what about a character in a video game based on the Sherlock Holmes books? I ask because it is conceivable that we are now living in a Matrix-style world, and it seems to me that it would not matter what the detective that you might meet in the real world would be made of. What if he was like a character in a video game, though?