...I'm not sure there's any point to that, trying to say something is real in one world but not in another. You traveled from one to the other. It would be foolish to assume he could not - I'm sure the people of Harrogate thought he was fictional in their world, before he tried to manifest. Most of them still probably don't know what happened.

They were not very active in your world. They weren't in mine, either. But whether something is real or not is not determined by which universe it's in, once you know travel between them is possible.