Board Thread:General Discussion/@comment-26871105-20150812150806/@comment-26216483-20150818024618

The "allergy to sound" could just be a side effect of his Stand. Also the fact that his Stand is named heavily supports the idea that he is a Stand user, whether human or not. I personally love the idea that he could be an alien though, and I think the fact that it's never officially determined makes him a lot more interesting.