Harry Potter and the Methods of Rationality by Eliezer Yudkowsky
The one that started it all. For those that haven’t read it, HPMOR is an alternate world story where Petunia married an Oxford Professor and Harry was raised with an understanding of science and rationality.
I would humbly suggest beginning here, where I rewrote the first four chapters, and then picking up at chapter 5 at the website. The original early chapters were a bit bare in terms of characterization and setting, and I wanted to try and hint at some of the depth and genius of the later story earlier on.
Twilight fanfiction where Bella isn’t just not-useless as a character, but is a rationalist with a mostly sane perspective on finding out that mega-powerful-no-downside vampires exist. Has a sequel and lots of spin-offs stories that are also worth checking out, though your mileage may vary on each.
Metropolitan Man by alexanderwales
Golden Age Superman rationalfic where Lex Luthor is the protagonist reacting to the idea of an alien god descending on humanity to dispense uncontestable justice. Kind of ruined Batman vs Superman for me before it even came out, since I knew it couldn’t possibly cover the themes as well, however hard it tried.
Branches on the Tree of Time by alexanderwales
Terminator rationalfic where Sara Conner is a computer scientist and programmer who actually understands the implications of time travel and how to take advantage of it. Similarly ruined Terminator: Genisys and all other potential Terminator movies, though those have been crap since 2 anyway.
Animorphs: The Reckoning by TK17
Back when I was considering trying my hand at a rational story there were a few ideas I had about what to do it on. Animorphs was near the top of my list, and I enjoyed participating in all the brainstorming in /r/rational both because of my love for the source material and how it teemed with such great possibilities.
Eventually I decided to go with Pokemon, and I’m glad I did for a number of reasons, one of which is that whatever Animorphs story I wrote would have been a feeble shadow of The Reckoning. This story is everything I ever wanted in a rational animorphs story, and more importantly, what I didn’t even know I wanted. If you’re a fan of the canon work at all, you owe it to yourself to check it out. If you’re a fan of compelling characters, interesting plot, and superb writing, you also owe it to yourself. In a just world, this story would become even more popular than the canon series, for its excellent and entertaining explorations of rational decision making, the harsh realities of war against a ruthless and intelligent opponent, and the difficulties of figuring out what the right thing to do is when there are no good options.
The Waves Arisen by wertifloke
Fantastic and compact Naruto rationalist fic that does about as much to the story and world as what HPMOR did to Harry Potter. Definitely worth reading if you’re a Naruto fan, and may even be worth reading if you’re not.
Demonology and the Tri-Phasic Modell of Trauma by Nnm
This is a fantastic fanfic, and may be my favorite representation of therapy in fiction. It’s based on Good Omens, taking place after the events of the book/show, and involves the demon Crowley going to therapy.
(Minor caution, the story’s only real failing in my opinion is that it tries but doesn’t quite manage to evoke the original’s writing style, which means the repetition of the word “professional” can get a bit distracting, particularly early on before you get immersed.)
Original Web Fiction
Worm is one of the best superhero stories I’ve ever read. Amazing worldbuilding, characters, plot, fight scenes, powers, everything you could ever want in a realistic “cape” story that I enjoyed even more than any from the Marvel or DC universes. Much like The Wire ruined cop shows in general, while Worm didn’t quite make other superhero stories unwatchable, it did render them difficult to take seriously.
The same author has also written Pact, an urban fantasy story that’s even more grimdark than Worm, and Twig, a biopunk alternate history that’s probably my favorite of the three.
Worth the Candle by
cthulhuraejepsen Alexander Wales
The isekai story to end all isekai stories. Juniper Smith is a high schooler who finds himself transported from the middle of class into a strangely modernish magical world with features both alien and familiar: Aerb, which turns out to be an amalgamation of all the tabletop RPGs he ever created and ran for his friends, with all their unique races, countries, magic systems, and monsters. Too bad the magic character sheet he sees floating behind his eyelids is nothing like any of the games he’s ever run.
One of my favorite stories of all time. The plot is great, the worldbuilding is mindbogglingly rich and layered, the characters are fun and flawed and realer than real. Definitely a must-read if you’re a fan of tabletop RPGs, but you should probably read it even if you’re not.
Imagine if the God of the Old Testament was real, and speaking parts of his True Name (in Hebrew of course) let you cast magic spells. Then imagine corporations patented parts of the Name to monopolize their use, and were resisted by an underground coalition of Unitarian Universalist communist kabbalists. Then imagine the whole thing was written like a cross between Douglas Adams and Good Omens.
It’s pretty fantastic, is what I mean to say.
Three Worlds Collide by Eliezer Yudkowsky
There’s not much to say about this short story other than that it accomplishes what sci-fi does best, using improbable situations and compelling plots to hold a mirror up and help us to examine ourselves, our beliefs, and the very essence of what it means to be human.
A Practical Guide to Evil by ErraticErrata
This is probably one of the downright “funnest” stories I’ve read that don’t quite veer into a comedic genre the way something like Unsong does. Its setting and characters are fantastically constructed, and the premise is both original and gripping: the world is full of Heroes and Villains that are granted Roles based on their background and skills, and the author holds little back in making the protagonist an actual Villain rather than just an anti-Hero or similar, while still managing to keep her sympathetic. And as I said, the characters are just… fun. Best comparison I can make is to The Dresden Files, which is one of the highest compliments I can give.
Shadows of the Limelight by alexanderwales
One of the more unique magic systems I’ve come across, where every human has a power over a specific element or substance or idea, and the only way to get stronger with it is to gain fame. This leads to characters and a plot that is wonderfully meta in its examination of what it means to be a hero or villain, and the motivations that lead people to power and influence how they use it.
Mother of Learning by nobody103
Well constructed caught-in-a-time-loop story with a familiar yet original fantasy world and magic system. One of the few stories where even as I personally find the characters lacking, I enjoy the rest so much I’m still reading, as the protagonist’s approach to improving himself and solving the mysteries of the situation he finds himself in are well thought out and executed, while still containing enough mistakes and setbacks and unexpected surprises to keep things entertaining.
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