I'm in the midst of writing a short story revolving around a young boy who mistakes a monster for a character from the DC universe. I'm curious though, as to how "fair use" or any copyright entanglements might come into play from referencing an established character like Batman or Superman in my own story. Mind you, I haven't placed the boy in my story within the DC universe, but is simply a fan of comic books. If I one day try to get said story published, would I need to get some kind of pass from DC? Or does it fall under some kind of fair use clause? Any opinions on this would be appreciated.