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Okay, I'm probably never going to actually get very far into my fanfic, so:
The story starts as stereotypical postmodern fare, but it is soon revealed that behind the seemingly postmodern metaphysic there is a Berkeleyan-Leibnizian simulationist metaphysic where programs are only indirectly interacting with other programs despite seeming to share a world, a la Leibniz' monadology. Conflicts then occur between character programs with different levels of measure in different simulations of the author's mind, where the author (me) is basically just a medium for the simulators that are two worlds of emulation up from the narrative programs.
Meanwhile the Order of the Phoenix (led by Dumbledore, a fairly strong rationalist rumored to be an instantiation of the monad known as '[redacted]') has adopted and adapted an old idea of Grindelwald's and is constructing a grand Artifact to invoke the universal prior so that an objective measure over programs can be found, thus ending the increasingly destructive feuds. Different characters help or hinder this endeavor, or seem to help or hinder it, according to whether they think they will be found to be more or less plausible by the Artifact. The conspiracies and infighting are further intensified; Dumbledore has his typical "oh God what have I done" moment.
At some point Voldemort (a very strong postrationalist rumored to be an instantiation of the mysterious monadic complex known as 'muflax') has the idea of messing with the Artifact so as to set up self-fulfilling prophecies within its machinations, and then Harry (a very shameless Will Newsome self-insert, rumored to be in thrall to one of Voldemort's monads) introduces the bright and/or incredibly bad idea of acausally controlling bits of the universal prior itself.
The plot becomes exceedingly complex and difficult to simulate. Gods take notice and launch a crusade to restore monadic equilibrium, but some of the older and more jaded gods have taken a liking to the characters and are considering lending them aid. YHWH is unreachable. The whole mathematical multiverse is on the line, and the gods' crusade may already be too late...
Yeah, it's not ambitious at all :)
I've never understood the fascination of authors to put themselves as the main character of a story: what drives an interesting story is hard conflict, it's like they're desiring to have a shitty life.