One of the defining features of Creepypasta is that a lot of the horrors witnessed are beyond our understanding.
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SCP Foundation- The Slender Man is the most popular example. No one knows what he is, where he comes from, or even what he wants. Also, both people and technology tend to go crazy when he's around.
- MissingNo. He corrupts the world, can delete your Hall of Fame records, and is always shifting.
- Zalgo is a Lovecraftian God of Evil that corrupts the world with even just the mere mention of his name. Z̵͍̖̹̹̈ͣ̒̅̅LA̸͙̜̝̟̜̲͛ͅL̢̧͈͉̯͙͆ͧ͘G̢̬̣͌̿ͮ̍̿ͦ͗̚͠O̫̾́ͩͫͤ͛̉̔́ͣͧ͐́̚҉̫̘͎̪̟͠ͅEC̡̨̺̻͕͔̼͉̺̑ͥͅO͎͇̞̹̮̭̱ͭ́͑̀͋ͪM̴̖̩͖͓̪̐̍ͯͬ͐E̴̪̯͙̜͚̝̋ͮ͊ͩ̏KUT̳̮̂͊EͯH̶̛͉̞͉͕̩̻̽̃̀
- Whatever Probst has let through the barrier into our world in No Pity for the Dead
. - The titular creature from The Horror from the Vault. It's psychic enough that it can inflict truly horrifying dreams for anyone unlucky enough to be in range, and although first portrayed as a Humanoid Abomination, it grows into a Lovecraftian monstrosity resembling a crab made out of body parts after consuming and absorbing the inhabitants of the facility where the creature's sarcophagus was being studied, and the surrounding town.
- The Darkness from Driftwood is a primordial force of evil which guzzles the life-force from anything it touches, turning them into skeletons.
- Orwin features Dark Young and their mum Shub-Niggurath as the Monster of the Week.
- The God of the Forest (a.k.a. the Giant) from Accounts from a Lonely Broadcast Station.
- The Thing in the Underground in Radio Phil is a nebulous, evil force that inhabits the darkness underground and wants children's souls.
- Bragnarokk from That's the Last Time I Make a 2 A.M. Burger Run is a levitating, betentacled creature with a cone-shaped, eye-studded head, and wears a storm cloud as a cloak.
- In "Candle Cove", the eponymous show itself is implied to maybe be one. It can apparently only be seen by certain children, looking like static to everyone else, and it might be aware that it is being watched. But it is a case of Maybe Magic, Maybe Mundane.
- The "Jackal" in a story called "The Cave". Carvings of it found in the cave are all mostly scratched out. When the protagonist sees it, it's so incomprehensible that it really "looks" rather like that.
- Dogscape has the world entirely turned into Meat Moss made of dog parts except for a few humans, thanks to an entity called "the Dog Mother." A soldier manages to claw his way down to it in a fit of Unstoppable Rage, but it quickly kills and assimilates him.
- This is what The Fear Mythos is all about. There are a few Humanoid Abominations (The Slender Man, the Cold Boy, the Blind Man), and then there are the Starfish Abominations like EAT (sentient water that can replace all the water in your body and take you over) and the Empty City, which traps its victims inside itself, making them wander around its evershifting structures until they die.
- In Sonic.exe and the Remake, X himself is this. According to his official backstory, he was created in the gap between dimensions and had originally did not have an appearance resembling Sonic himself. He's omnipotent within his home world, to the point where he can make his world seem a lot like Sonic's at first glance just to give his victims a sense of false security. And the Sonic characters that X kills? Those are actually his previous victims, trapped in the bodies of Sonic characters and forced to be his "slaves" (all the while they're being killed in-"game" in very gruesome manners just to play with future victims before he steals their souls).
- Tales from Cherryshrub, Mississippi:
- Mgorr and Bgorr, two twins birthed from a mindless being known as The First Cause. Mgorr can best be described as a gelatinous mass with multiple eyes all over her body with a scorpion's tail and praying mantis-like claws.
- The Many, an aqueous-beast that assimilates organic matter into itself.
- The Old Man from An Old Man Visited a Town who has an emaciated face and sunken in yellow eyes. The narrator notes how he wobbled around as if he did not have feet.
- D'regorra, a multi-armed woman who is knowledgeable on all forms of torture and stitches every orifice of her victim's body to ensnare them to her.
- The titular entity in There's a god in my woods takes the form of an emaciated deer with deformed antlers and a mass of half-decayed, undead birds and possibly something more where its stomach would be. Thankfully, it leaves the protagonist alone.
- Abandoned by Disney has the Corruptus as their abominations, beings created from the faulty minds of humans, chief among them being Photo-Negative Mickey and the entity that causes the deaths of the people in Room Zero
