Sounds like a cool project. For me fandom does several things. As a writer it allows me to get into my favorite characters heads and share the way I see them with others. As a reader it allows me to see the way others view them and see things about them I might not otherwise have taken into account. On a more superficial level it allows me to pair up my favorite characters. Finally, as both a reader and writer it allows me to get a resolution to conflict that is rarely taken past the very surface levels in cannon, and to explore the possible consequences of that conflict instead of having it glossed over and forgotten as it so often is in cannon.