The Wanderer's Library is a sister site of the SCP Foundation, based on the main location of the Serpent's Hand Group of Interest. But while the SCP Foundation is (ostensibly) a horror site, and thus has strict tone and format requirements, the Library plays much faster and looser with its requirements. Almost any type of story is fair, from crime to science fiction. Whereas the Foundation focuses on creating a feeling of “fear”, the Library focuses on creating a feeling of “wonder”. This doesn't mean that other types of stories are forbidden; the stories can be just as gruesome or disturbing as what you might find on the Foundation.In universe, the Library is a Magical Library located outside of any other universe, accessible through portals called “Ways”. The Library's catalog is massive, containing books that have already been written, have yet to be written, and will never be written, from an equally massive number of universes. Who created the Library, what purpose it serves, or where the books come from are all unknown, but many theories have been proposed.The patrons are just as varied as the books. You're just as likely to find a human scholar as you are to find a god, talking animal, or alien, non-Euclidian explorer. Assisting in running the Library are the librarians, people who have broken the rules of the Library and physically transformed. The eyeless Archivists serve at the main desks, and can tell you where to find each book. Docents, mouthless humanoids with lanterns for hands, enforce the rules and help patrons wandering the shelves. Restocking of shelves is performed by the spider-like Pages.Note that most stories are not set in the Library itself- it simply acts as a Framing Device. Most of the stories take place in one of the (seemingly) infinite number of worlds it connects to, or maybe they're made up, or maybe it's a bit of both. Who knows?The list of stories can be found here. The archives, stories focusing on the Library itself, can be found here.
Alien Sky: The Unwaking. The sun changes color with the days of the week: On Tuesday and Thursday it's red, on Monday and Wednesday it's yellow, and on Fridays and Saturdays it's blue. It used to be dark on Sunday, when Sunday was still alive. Don't ask.
As You Know: Often completely averted. Entries are written from the perspective of people who assume the reader will know everything about the world they take place already, and the appeal of many is trying to glean as much information as possible from a very limited amount of exposition.
Civilized Animal: The Elrich series of tales features them. In one, From the Crown Press, a notice is put out warning of an “armoured force of mystic marsupials, which were supported by a column of raccoon mystics”, and orders a death sentence on them.
The Conspiracy: "A Brief History of Stairs" has a hilariously petty one. For a long time in the world of Elrich, elevators were the only method of going up. When stairs were invented, they posed a threat to the livelihood of the Elra Architectural Sub-Union, which made elevators. In order to discredit stairs, they loosen one step that the king will be going up. He falls to his death, thus making sure no one will use stairs again.
Crapsack World: Several, but Ur probably takes the cake. Lower class citizens are treated as nothing more than batteries for powering magic in Alteres, Harrhem is being destroyed by the very earth, and Etten is being slowly covered by an Eldritch Location created by gods afraid of death.
Deadpan Snarker: Peristrixalo. “Just once, I would like to meet something beautiful that tries to kill me, but I suspect that's asking far too much.”
Death of the Old Gods: And I Was Present at the Death of A God, wherein the god of Tasmanian Tigers begins to die along with the species. He Gets Better once his Thanatos Gambit pans out... seventy years later
Doorstopper: The Journal of Aframos Longjourney, at least by the standards of the site. It's well over 70 entries and still going, all describing the travels of the eponymous Longjourney.
Downer Ending: Elrich is destroyed by its stars, which are then captured and contained by the SCP Foundation at an unknown point in the future. A Hand, An Eye, A Tooth ends with protagonist being killed by her husband for her disfigurement.
Eldritch Abomination: Whatever is in the Cave of Red Flies. “It had smooth red skin like that of a frog, had the body of a bare man, legs like those of an eagle, and four crimson-feathered wings. I could not see his head or face, or more likely my sanity forbids me from remembering. But I remember those two great eyes, impossibly large, shining with an intelligence like laughing fire.”
In Red Bark, the narrator meets a village living on the edge of creation. They have planted the titular red-barked trees to delineate the edge of the world. Villagers and houses living on the wrong side of the line turned into something else.
The Library itself. A repository of almost every book ever written, as well as countless others that have never been written and will never be written. It features portals that lead to various points in various realities. Oh, and it's capable of defending itself against any kind of attack.
Fantasy Kitchen Sink: Stories range from science fiction to urban fantasy and often blend genres. The Library itself acts as a waypoint between many, many universes, so almost any sort of patron can be found there.
Imaginary Friend: The narrator of The Places the Mind Cannot Go is one, created to help boost a child's self-esteem. When the child begins to feel good about themself again, it's left without purposes, begging to be noticed again.
Immortality: The narrator and his allies in There Were Six Of Us Once, though it's not clear what type they fall under and implied one is eventually killed. Turns out it makes them prime targets for the SCP Foundation. It's also implied the narrator of The People I Have Been is this, changing forms regularly to extend his life.
In the GOI page for the Library, several beings who are several thousand years old are mentioned.
Peristrixalo is stated to be older than the Victorian era.
Jerk Jock: Wesley from I Date A Teenage Cyclops is a textbook example.
La Résistance: In Victoria the Earth has been taken over by… something. What exactly is never made clear, but they're opposed by the Human Resistance Group, who uses superior numbers and technology to fight back. Whether it eventually succeeds or fails is never elaborated upon.
Living Forever Is Awesome: Not awesome per se, but the narrator of The People I Have Been seems quite happy with his arrangement, saying “I've been a soldier and a minister, a leader of men and a follower of causes. I've preached hellfire and harmony. I've said words profane and holy. I've been people I didn't like, and people I wish I could be again. But that's life, Emma. Life isn't static, it isn't frozen. Life doesn't stand still. It changes, and it changes us. This is just another step.”
Magic Librarian: The Library has a variety of librarians seen here, ranging from spider-like beings in charge of reshelving books to silent monstrosities who guide patrons. Some are implied to be human, some are implied to have been human but are being punished for breaking Library rules.
Mind Screw: The Cyphers, “is a collection of seemingly random quotes and musings, most of it handwritten. Based on the styles of handwriting found, the original authors number in the dozens. Some of these quotes have been deliberately arranged to form dialogues or storylike proses.” They make about as much sense as it sounds.
Physical God: They appear frequently. Communion, Gods of Money, and Sedna V. Ataciara the Qalluk to name a few.
Rebellious Spirit: Victor from I Dated A Teenage Cyclops rejects standard cubic-Earth theory for present-day mathematics.
Sanity Slippage: This happens to a book in Of The Metabible. The Metabible, a godlike entity over which wars have been fought, is an impossibly long book. As you read farther it begins to get more and more incomprehensible, and by the millionth page it's completely broken and begging for somebody to read it. The last page of the book separates itself from the Metabible and forms a second one. It's implied it eventually goes through the same process.
Science Is Bad: The Rise of the Steam Soul, though it's not science per se.
Second Love: After Emilio is eaten by a pigeon, Elizabeth from A Loaf Story finds happiness with this in the most Tearjerking way possible.
Shout-Out: To Discordianism: The five seasons of discord are discussed in Season of Chaos, and gives it its name.
Switching P.O.V.: And We Slipped Away, which is written from the point of view of a man and his murderer during the few seconds before he dies. The two inner monologues run together to form a continuous narrative.