Alexandra
The black-eyed cousin
I've been in a variety of gaming groups over the years, and have played in what could technically be considered fandom roleplays, though I only discovered that category when I can to this site. I'm a die-hard dice roleplayer, so pretty much all of my resources have a codified system and setting attached, ie; an established universe for us to work with. I find these kinds of boundaries can offer clarity in what can and cannot be done character and plot-wise (like an exercise in learning to break the rules intelligently).
One of our unwritten rules for playing something set in, for example, the Firefly universe, was that *no-one* would ever get to play, or speak to a named character from the show. Ever. For us, that solved the "you're not doing it right" arguments before they came up. If you're doing fandom roleplays right, in my opinion, you should be using the universe to tell the stories that never got told, and make your own mark.
One of our unwritten rules for playing something set in, for example, the Firefly universe, was that *no-one* would ever get to play, or speak to a named character from the show. Ever. For us, that solved the "you're not doing it right" arguments before they came up. If you're doing fandom roleplays right, in my opinion, you should be using the universe to tell the stories that never got told, and make your own mark.