My one exception to this: by
Huinesoron
on 2017-11-20 09:08:00 UTC
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Sometimes, the setting itself is enough of a 'canon character' to take the central role. Middle-earth is the obvious one (for me) - you can pick any time and place in Middle-earth's history and reconstruct enough of the culture there to make a compelling backdrop for a story. I have a series of five vignettes set in various places around Middle-earth, and the only canon character who appears is an Ent who was namedropped by Treebeard once. Do the stories suffer, just because I didn't force my two dwarven lesbians to hang out with Thorin or Gimli? Does the tale of a disabled Hobbit need Merry and Pippin to play with him and show that he, too, is a person? Not in the least. They are characters in their world, and that is all they need to be.
Similarly, I could imagine writing a murder mystery set on Qo'noS, starring only Klingons, in which canon characters were mentioned (it'd be hard to not namedrop Kahless the Unforgettable) but didn't appear. Klingon culture is fleshed-out enough for that. You couldn't do the same thing even on Tatooine - the GFFA's #1 filming destination, apparently - because all the culture is either generic or centred on canon characters. (Yes, you could write about how terrible it is to be a slave, but you could set that in America and not change much.) But you could write about living in Jabba's Palace, for instance, where the canon character is - as Miah says - central even when he's not around.
The flip flip side of this is that you have to make your readers want to stick with the story. A Percy Jacksonverse story about your OC Ariadne O'Shea and her quest for the wreck of the Argo is all very well, but unless Ariadne is interesting enough to pay attention to, people are going to head down to the Percy/Annabeth fluff underneath. Fanfic readers are there because they like the canon, so you need to use enough of the canon to keep them there.
My goal with fanfic is to explore unexplored angles. So in the above example, you could find some gods who Riordan hasn't covered (though good luck!), or draw on a myth he hasn't touched. If, though, your story is 'they go through the Labyrinth and run into traps, then Hades tries to trick them, and then they fight a cyclops'... then you're not doing anything new, and why does anyone want to read? Only if Ariadne has a really good hook to draw them in...
hS