A lack of disclaimer from their authors stating the work is fiction, which may cause the lines of reality and fantasy to blend. Often, real or well faked place names, character names, or website names are used. note (Here, "well faked" is defined as requiring an average person to do research to discover fictionality.)
The Slender Man Mythos: The Creepypasta. It's neither the Trope Codifier or Trope Namer, nor does it actually have much to do with the genre's creation, but by now it is legendary. note The stories (Everyman HYBRID in particular) are also the main reason why The Rake is even vaguely well-known nowadays. Original Description: One of the most engaging out there, and currently the most well known.
Notable as someone made an actual game based off of this creepypasta, although it isn't a hacked ROM but a game created in Game Maker. It faithfully recreates the game experiences of the original, and then expands upon the content through help of the author. It's strongly suggested that one play the game first and then read the original, since the original creepypasta is effectively one big spoiler for the game. Available here.
The webmaster also held a notable Creepypasta contest as an event on his website, all the entries of which are on the site, along with the webmaster's own two more serious pastas The Five and Headed South.
And this year there was a second one with more than double the entries of the last!
The Untitled Fantendo Story sorta fits this, especially in the "real life" chapters. Has a much happier ending, since the author did not write it intending for it to be creepypasta-like.
Zeddicker Casefiles: a serial blog that seems fairly new but is updated regularly. It combines the Hardboiled Detective genre with dark fantasy. Not as nightmare inducing as some of the other links here, but it's really meant to be a paranormal detective story. That said, some elements of Nightmare Fuel are scattered throughout.
All Hallows' Eve: These can and do take place at any time of the year, but God help any unfortunate soul who is the main character of one that does take place as Halloween, considering how potent some of the horrors in these are at regular times of the year.
Aluminum Christmas Trees: A surprising amount of creepypastas have their entire story based on things that are actually real! Some examples include Hello Kitty Murders, Rap Rat, and many lost episodes. note Granted, most lost episodes won't involve the characters being killed or raped, like the creepypastas, but they do exist.
Audience Participation: Some of the best ones add new levels of scary by hinging the ultimate fate of the main character by how much help the audience at home are. You fail, The Hero Dies. For that matter, the viewers might benext. One less serious creepypasta actually was based around this, where the object of it was to add new paragraphs.
Being Watched: It wouldn't be one of these if this didn't happen every other 'pasta.
Bittersweet Ending: While most creepypastas end with a Downer Ending or No Ending, Pokemon: Lost Silver (presumably) ends with the protagonist coming to terms with his death, after having a successful career as a Pokemon champion. Even then, this can still be taken as a downer from a nihilist point of view, that his success will eventually be erased after his death.
Lost Silver: Hidden, however, shows that there may be something much more sinister going on.
Jeffs from the Worm Jeff Saga have a gland that produces a powerful acid located near the stomach, and Drone Leaders have this replaced with an organ filled with what is essentially lighter fluid, which they ignite using a "flint" in their mouths to spit huge fireballs.
Of note are the inhabitants of Granny Royce's Road House. None of them can die, despite them all having been slaughtered in various horrific ways. One of them was a pregnant woman with a permanent cut-open womb and a living zombie baby inside her.
The whole point of They Are Watching Me. And Now They Are Watching You. It's written like a story, but it begins with the narrator telling you that he is praying that no one reads this, and ends with him apologizing to you that you read it, and that as a result, if you stop reading it, the creatures in the story will come after you.
Brought Down to Normal: In "The Worm In Paradise", Slenderman is temporarily stripped of most of his powers and is forced to rely on his wits (and tentacles.)
Brown Note: Several involve something, be it a video, picture, music, etc, that causes people to go insane, or worse.
Very prominent example in The House That Death Forgot: He will kill you in a variety of painful ways, but even though you're dead, you stay conscious, mobile...and your mortal wounds will continue to cause you pain. And if those wounds are visible, you pretty much stay out of sight to avoid horrifying people.
Dark Is Not Evil: "Love" - a girl finds a note addressed to her on her computer, describing all the paranormal activity and shadows she's seen her entire life. It was a soldier who made a promise to her dad, shortly before they were both killed in war, to look after his soon-to-be-born daughter. Since the daughter turned 18, he decided his work was done and to give her some closure on the weirdness.
Zeddicker describes himself as "somewhere between" the angels and demons in his town.
The Willow Men has a bunch of otherwordly, Slenderman-esque creatures that whisk their victims away and horribly torture them until they die. However, since they only do this to people who have committed horrible crimes — such as the protagonist, who murdered his wife — they come across as Well Intentioned Extremists at worst.
Dark World: Where a lot of the central characters end up before the end of the tale.
Even Evil Has Standards: Jeff, the mass murdering psychopath who's entire life revolves around making living things dead lets a little baby live when he encounters it in the crib. Saying that he'll get to him when he's seen more of the world. Until then, he tells the baby to go to sleep and hands it its teddy bear. Then leaves.
Expy: Jeff the Killer is basically The Joker with an origin story and a heaping helping of Uncanny Valley. He's even got two joker origins incorporated into his, with the chemical alteration of his face and a Glasgow Grin carved into it.
Speaking of Jeff, Worm Jeff is this for the Jason parasite from Jason Goes To Hell. However, as the author explains on the Deviant ART copy of Evil Never Dies, this was unintentional as she had never seen the film until she had other people look at it on Creepypasta Wiki chat and someone pointed out the similarities between it and Worm Jeff's life cycle. In addition, There's another nod to the Joker in the "mythos", as the substance secreted by Worm Jeff's stinger that slowly turns victims into Jeff The Killer or mutants that resemble him is called "venom", after Joker Venom, which it was clearly inspired by.
Jeff now has his own army of expies, enough to make the Creepypasta Wiki ban the so called "Jeff Formula".
Fanwork Ban: There's a long list of pastas you are no longer allowed to make spinoffs or fanquels of on Creepypasta Wiki. The reason for this? For a long time people were posting nothing BUT spinoffs, and very few original pastas were being written. There's a loophole in this, however: you can post the story elsewhere and link to it on your user page, or use Spinoff Appeal to have the admins review it and add it to the wiki if it "passes." Furbearingbrick, the admin who decreed the no-spinoffs rule, said this about Evil Never Dies (which was written shortly after the ban was enacted): "I AM AWARE OF THE IRONY." Recently subverted with the creation of the Creepypasta Spinoff Wiki and Spinpasta Wiki, two wikis where you can post spinoffs.
Fighting a Shadow: In the Worm Jeff Saga, even if you DO manage to kill Jeff The Killer, he'll just escape the corpse of his host and find a new body to possess. This happens so often, in fact, that Jeff has weaponized this concept, medling the corpses of former hosts together into huge, organic "tanks" called Jeff Crawlers. Also, in "Please Follow Me", it's revealed that he keeps a literal horde of former hosts, which live in a cave under the city! Oh, and they're breeding.
Only Person: The main characters are often the only human characters of any significance in these.
This trope used to be such a problem with Jeff The Killer (too many pastas were just the original Jeff story with the Serial Numbers Filed Off, to the point where Jeff became an Overused Copycat Character) that "Jeff-inspired" stories were banned on Creepypasta Wiki.
Jeff's not the only one. This trope is such a problem that Pokepastas, Lost Episode stories and Slenderman stories have all been banned from the wiki.
Fridge Horror: There are some creepypastas that in themselves may not be as scary; but when you see it...
Others conclude with the protagonist realizing that something mundane actually means something is very wrong indeed. For example, Barbie.AVI concludes with the protagonist wondering why an abandoned house still has the plumbing hooked up, and The Basement ends with the protagonist discovering a footprint outside his back door, meaning someone else entered the house to watch his neighbor die.
Ghostly Chill: Whether or not they're actually ghosts sometimes doesn't matter. No matter the Horror, the main character will probably experience this at some point.
Glorious Mother Russia: Is Memetic Mutation on capitalist internet to rewriting creepypasta as if taking place in Soviet Russia. Thick and heavy Funetik Aksent is spelling in text, and Gratuitous Russian using sometimes. Result of tales is often change, as true Soviets able to endure much more grueling punishment than weak American dogs. Vodka is much present, and many things - bodies, important papers, sometimes even Artifact of Doom itself - burned for warmth without second thought. Such is life in Moscow. Some of there provide ample Nightmare Retardant.
One example of disgusting American pasta here and its glorious Russian version here (Encyclopedia Dramatica may not safe to open in capitalist workplace. You need real job ploughing fields, is only solution).
Gorn: Some pasta writers just plain don't do subtlety.
I Am Not Shazam: Worm Jeff is just a nickname given by the author to the mind-controlling parasitic antagonist, to avoid confusion with his hosts (which are also called Jeffs) and the "canon" Jeff. Everyone in-universe calls him Jeff, Jeff The Killer, or Master.
Lightning Can Do Anything: Played with in "One Door Closes, Another One Opens." Jeff was transformed into Worm Jeff by being struck by ball lightning as he was dying, but it is strongly implied that it may not have been lightning at all.
Perfect examples of this are the Pokémon creepypasta Ghost Black and Lost Silver, which are simply the author describing what appear to be nothing more than very morbid Pokémon rom hacks that were written to cartridges. There is no evidence to suggest otherwise and nothing strange happens to the author of either other than them being incredibly freaked out about it. Supernatural possibilities come from wondering who in the world would do this and why. (On top of the fact that hacking the games to such an extent has only recently become possible)
"Helen": The narrator finds his grandfather acting bizarrely in his new apartment, claiming someone named "Helen" is taking over rooms and making threats. Turns out some computer virus has been downloading obscene material and relaying threatening messages through a Bonzi BUDDY called "Helen," and with the computer gone the grandfather starts getting better. The narrator still thinks it's weird that there's no documentation of the virus online.
"The Toadman": The narrator is an elderly man who recalls an event in his past involving a being called the Toadman. It's left ambiguous whether or not the Toadman is supernatural.
Mundane Ghost Story: Perhaps most terrifying of all, some of these stories use completely plausible set-ups and even twist endings. Texas Blood, for instance, reads less like a straight-up horror story and more like an excerpt from a particularly dark & gritty cop/thriller novel.
One Curse Limit: Worm Jeff's mind-link keeps his infectees from falling prey to mind manipulation from other Creepypasta entities. This has only been demonstrated to be true with Slenderman so far, but that alone should let you know how untouchably powerful Worm Jeff's mind control is.
Our Vampires Are Different: The Broken Glass Beast, from "A Touch Of Glass." A magical construct made of multicolored broken glass is certaintly not the first thing that comes to mind when you imagine bloodsuckers.
Reality Ensues: This story takes a decidedly more realistic take on Jeff The Killer. Jeff's murder spree ends soon after it begins. Jeff may be a psychopath but he's still just a 13 year old who cut his face up. He's effortlessly fought off in his last two attacks and the Glasgow Smile and burns he gave himself end up quickly getting infected and he dies after only a few days. The story ends with the implication that any other "Jeffs" that we see in stories are just copycat killers inspired by him.
Screamer Prank: The .GIF, which is about a smiley face made up of a mouth and eyes cut-out, which turns into a frowney face. Then, it screams at you, shows some horrific imagery, and closes your internet browser. People who watch it in it's entirety are found dead with a smiley face drawn in blood next to them. Luckily, the image board immediately takes it down it and bans whoever tries to re-upload it, possibly the only use of the "removed it after 5 minutes and blocked me" cliche' for a benevolent reason, ever.
Shock Site: Some of the more disturbing images associated with creepypasta, like SMILE.jpg or Jeff The Killer, are frequently used for this purpose. Sometimes, like with Normal Porn For Normal People, a Creepypasta is centered around a supposed Shock Site that is too scary.
Slasher Smile: Any creepypasta monster has about a 50/50 chance of having a really creepy smile.
Snow Means Death: A recent addition to The Creepypasta Wiki kicks off when it randomly begins snowing in the middle of May...
Snuff Film: The creepypastas titled "Snuff Film". The first posits that many snuff films have been made and distributed around the world dating all the way back to 1896, with the latest hailing from 1984 and all of them have the exact same nineteen year old girl as the "star". The second describes a bunch of snuff films in gory detail, the very worst one being saved for the end which the narrator considers their finest work.
This may be the subject of a creepypasta.
Happy Appy has a lot of this, and says the trope by name.
So Bad, It's Good: The Creepypasta website has a sister site, Crappypasta, where the rejected submissions go. Some of them are so god-awful it's hilarious.
Deth Trumpet deserves special mention for its sheer lulziness.
Stylistic Suck: Anansi's Goatman Story is supposed to have been written by a teenager on 4chan, so it has an abundance of cursing and poor grammar. The readers seem to be split on whether this is too distracting or whether it makes the story more realistic.
Subverted Kids Show: Many of the "lost episode" and "The Truth Behind [show]" 'pastas, describing horrific episodes that never got aired (or were mistakenly aired) and putting forth theories that the characters are based off dead children respectively.
Too Dumb to Live: How else do you think so many of the protagonists get hunted/haunted?
This is especially true in The Most Dangerous Video Game-style creepypastas. Unless there's a supernatural force forcing them to keep playing, you'll probably hear some variation of "I knew I should probably stop playing, but I didn't" at some point.
Touched by Vorlons: In The Brother's Return, this is revealed to be how Worm Jeff was "born".
Tragic Monster: It's surprisingly rare to do this successfully (the original Jeff The Killer story tries to make the audience sympathize with Jeff and fails miserably, for instance) but when it's pulled off well, it's pulled off VERY well.
General Angus from the Worm Jeff saga. He was blackmailed, transformed against his will, and now he lives with the knowledge that he will never see his son again.
Uncanny Valley: In-universe; in Anansi's Goatman Story, when the creature is scratching at the trailer door, it begs for the protagonists to let it in (imitating their friend's words earlier). It is noted to lack normal speech cadence, which is one of the things that makes it obvious to the protagonists that what they are dealing is not human.
Elmebrigge: "Well, some [of those possessed by ancient eldritch abominations] have been known to talk in their sleep. Others may shake their leg absent-mindedly whenever they sit for a while. Others, when they read something, say, a book or newspaper, will mouth the words to themselves. Some will have songs they haven't heard in years, or only know a few line of, recur in their heads in a seemingly endless loop."
Zeddicker: "That's impossible. That describes a lot of people."
Elmebrigge: "Yes, it does. Quite a lot of people. Millions, perhaps."
Willing Suspension of Disbelief: One advice towards writing a creepypasta is to try to keep within the willing suspension of disbelief, especially when it comes to a video game Creepypasta.
Writers Cannot Do Math: "Russian Sleep Experiment", while an effective horror piece, has several discrepancies with the number of living subjects. At one point, before any of them have died, the story describes the activities of two and then refers to "the remaining two" (there are 5 at this point). When they are removed from the chamber, one is already dead, one is killed during the struggle to remove them, and one dies on the operating table, yet the story continues as if three are still alive, not two.
"Foreign Exchange Program" also states that twelve people were chosen - however, four decided to stay, two died off, and seven returned. Where did that thirteenth person come from?