Good discussion here.
Just some questions. What's the difference between Shared Universe (SU) and In Universe (IU)?
It seems to me that anything original that happens in any fanfic (dialogue, action, etc) is an "additional event" - it's not part of the canonical story. So by that definition, every original fanfic will always be SU, rather than IU. It seems impossible to write an IU fanfic. So with this definition, the term "IU" is essentially useless for discussing fanfic.
I think a more useful terminology is-
IU - any story
based on the canon universe, which does not clearly contradict canonical events, e.g. he Young Ban Danna Chronicles, life and love on Argon Prime, a marine story of the ground battle on Olmanckenstrat's, etc. Stories such as
Mystery of the Scorpion,
Red Glow,
Station 89. These stories all occur within the basic X-Universe framework, all add content, yet all keep clear enough of plot characters and events, and close enough to canon backdrop, as to be
*possible* within the canon universe.
AU - any story
based on the canon universe, but clearly non-canon e.g. alternate history - what if the Split won the Boron Campaign?! If Julian had gotten away and stayed Pirate? This would include stories such as
Siege where the Kha'ak have clearly proven more of a threat than in the canon universe. Basically, stories that explore the canon universe in a "what if this had happened?" kind of way.
NaFF - If a story isn't based within the basic X-U framework, it's Not a FanFic! Or at least not an XU fanfic.
Clearly there's a big grey area, where people disagree about what's possible in a canon Universe - what's IU and AU. There's also the problem where latter canon additions make earlier fanfics non-canon (for example, if Julian dies in X3:TC, many existing fanfics about his post-game adventures will become non-canon. The nature of the Kha'ak and the lack of a DHEPT in X2 made
Dark Haven non-canon). That said, I'd say all X-U fanfics fall in or between these categories. I'd say it's broader, and more in-line with writer intent; I certainly intended my stories to be in-universe and went to some pains - particularly with
First House - to avoid breaking canon; to base my story upon accurate canon history and build my narrative into the gaps.
"EU" I'm not sure about. Don't all stories add something? "extra physical content" unknown sectors? New characters/races? Companies and organisations? "and additional events" dialogue? battles?
Don't all stories fit this criteria?