1 - 20 of 73 Works in Protective Error Sans (Undertale)
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Despite what he told the rest of the multiverse, what he had tried to tell himself, Error wasn’t nearly as against Soulmates as he pretended to be. You were perfect, his Star, only his. And he was finally ready to meet you.
Series
- Part 1 of Soulmate Au
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While the characters believe the multiverse has existed for thousands of years already, it truly starts with the first sentence of its story. Only Ink feels when it happens.
(...And then panics because he's now aware he's never actually protected a universe or had a conversation with a friend and probably doesn't know how to do any of that and they're all counting on him.)
Series
- Part 1 of awakening of a multiverse
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Yes, you read the title right. This is an askbox fic of a sans au who has endured the most painful times out of everyone else along with other Sans AUs that are either well-known or unfamiliar whenever they become available or not.
Currently available:
Self-Harm Sans
Error Sans
Healer Sans
Murderer Sans
Killer Sans
Scoundrel Sans
UNK! Sans
Nightmare Sans -
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"¡Bienvenida a la oficina, espero que tu estancia sea grata!"
T/N es una chica que comienza su primer día laboral en las Oficinas que se encargan de Administrar y Gestionar los Aus, allí conoce Error Sans, su superior quien se encargará de su adiestramiento.
Pero, en el momento que se encuentra con él, siente una sensación muy familiar, como si lo conociera de antes.
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If you have read the old version that I am too lazy to edit please erase it from your mind and put this work in its place instead pretty please.
~
TLDR: Error carries around a Miniature version of Nightmare around with him for like half or 3/4 of this fanfic
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Create-Tale, an unknown location between the empty space of the multiverse that separates the bubble of sketches from the antivoid. Who would have thought that the locals of both places would be in charge of the most important possession in the multiverse?
The world of the creators, powerful souls who follow these guardians and worship them as warriors. However, that security would fall behind human curiosity. After all, they are not fictional, like the creations. Or rather, their creations.(This story contains sensitive content; it is primarily intended as a horror story.)
(and yeah, errorink is canon here, guys /jk)
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This fic is more of a what if situation. What if instead of Nightmare taking Cross in, Error ended up doing that? How different would things be?
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Error watches, unflinching, as the skeleton's giant knife materializes, slicing through the stillness of the void. The vibrant glitches around his fingers pulsate more vividly in response, mirroring the tension. Despite the display of power, Error’s demeanor remains composed, almost amused by the dramatic reaction.
"You can call me Error. As for how I arrived here," he gestures loosely around them with a hand threaded with glitches, "I travel where the code calls, where anomalies beckon. Where the multiverse needs cleaned of anything that could harm it, and this place," he pauses, glancing around the stark whiteness, much like his own home, "Screamed for attention."
His gaze settles back on Cross, the colorful chaos of his form stark against the void. "You, however, are an interesting anomaly. Fighting so fiercely, clinging to existence in a world that has seemingly been erased." Error hummed, eyes still searching.
[[[ Slow Updates ]]]
Series
- Part 45 of Undertale Fics
- Part 5 of Roleplays
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System Error: Accidental Acquisition of Children by Frikisbits231
Fandoms: Undertale (Video Game)
05 Sep 2025
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Error slid down, glued to the tree, his back to the ground, into the lush green grass on the ground. Later, he'd take a look at his current situation and possibly eliminate the place without a problem. Meanwhile, Error was resting, leaning against this comfortable, curvy tree, closing his eyes to feel something, something of the place.
Feel... the familiar ambient magic?
Still no monsters, humans, or standard souls around. Well, no one could hurt him if he got some rest, right?
This time, he mentally prepared himself and repeated the safety tests he felt like a mantra so he could get some rest.
He fell asleep shortly after.
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Sweetness with hints of security, calm, and the tranquility of dawning rest captured his senses. Something... familiar. Like... like chocolate melting on his tongue. He didn't know how he recognized that either. Still, he pulled the tongue out of his space, to capture it. He caught the sensations, almost becoming overwhelmed by them.
(O: The one where Error acquires an abandoned baby bone, which is, of course, his offspring too, yay...)
Series
- Part 3 of Glitches & Errors Fics
- Part 2 of Random Writing
- Part 1 of ❤️🩹💞 Caring for Babybones 💞🥰
- Part 1 of Oh, look at a fanfic with one of the fanchilds!
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Open yourself up to a loving home( & love) [Cross/Error] (story arc 1) by Itzaria
Fandoms: Undertale (Video Game)
01 Jul 2025
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Error had spent a long time doing the same thing repeatedly. First, it was watching others that he loved go through the same pain while not being able to help. Now, it was to continuously fix all of Ink's mistakes regarding which worlds are fit to continue to exist.
However, all that changes when he happens upon Cross's world fresh out of its destruction, throwing a monkey wrench into how he had gone through life up to this point. With Nightmare's help, Cross is shaking up Error's life, but Error doesn't actually mind it as much as he thought he would.
Will Nightmare, through Cross, finally be able to convince Error that he, too, deserves a happy life and home? Is there something more behind Error's feelings for Cross? What is now waiting for them with all the new changes and opportunities? Follow them all as they answer all of those questions and more.
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Error takes Null and Void for a day out. It goes as well as you'd expect.
Connected to the ask-fgod tumblr blog's lore.Series
- Part 4 of @Ask-FGOD Works
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After the monsters win the monster/human war, most humans are whipped out, monsters taking over. Now, in the year 2113, Frisk and Chara are two of the few humans left in BlightView: the monster capital of the world, ruled over by King W.D Gaster, with his adoptive son, Dream, by his side. But like anything, the Castle holds many dark secrets of its own...
And of course, nothing is as it seems in the city as well, as it is that most people who don’t live in or near the city centre have it extremely rough, all being treated roughly and unfairly, living in poor conditions. A rebellion is soon formed in the “slums”, the outskirts of BlightView, run by Error, along with other misfits, like small, rundown Sans, who lives with a grieving Asgore outside of the city, and an enraged Cross, who wishes for nothing more than revenge, and young Killer, a boy who grew up in the slums without parents and a strange medical condition. The rebellion is the city’s last hope.
!!THIS STORY IS NOT COMPLETE!! please read the last chapter for more details, but the TLDR is that I'm working on completely rewriting it!
Series
- Part 2 of DystopianTale
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In Our Little Corner of the Multiverse by Greetings_Im_Leo
Fandoms: Sonic the Hedgehog - All Media Types, Undertale (Video Game), Spider-Man: Spider-Verse (Sony Animated Movies)
03 Jun 2025
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“What are we going to do?” Miles whispered the question into the air, sitting down heavily on his hammock. It swung and bounced a little because of the elastic webbing holding it up but didn’t flip. “It’s like we got everything we wanted and everything we didn’t all at once. I mean-” he turned to look at Shadow imploringly.
Shadow didn’t speak, letting his companion get his thoughts out without interruption. Shadow used his webbing to cuff Error’s limp hands together in front of his body.
Miles took it as a cue to continue. “I mean, we wanted this! This was the goal all along! We wanna be able to save people, not just sweep away their graves.” His voice got quieter. “But what can we do with them? With him?"-
Rejected by the primary "guardians" of the Spider-Verse, an alternate Shadow the Hedgehog and Tails (Miles) commit to making a place for themselves in a separate part of the multiverse as they watch over the expanses of worlds in their domain. What they certainly weren't counting on was taking anyone else into their tiny, close-knit group. But here they were. A couple misplaced Sans's later and their numbers went from three to five quicker than they could say "Arachno-Humanoid Poly-Multiverse."Series
- Part 2 of The Threads that Bind Us All Together
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He raised his head with difficulty. His eyes widened in surprise. In front of him was a portal, as glitchy as he himself, and he could see a dark sky with stars.
Error extended his hand and it easily passed through the portal and on the other side a light breeze blew across his fingers. It seemed that strength suddenly filled his body, and the magic responded with warmth and he literally jumped into the portal, turning out to be on an island that flew among the stars.
A surprised sigh escaped him before he sank down again, but now it was no longer the white empty floor of void, but I was soft, cool grass.
Stars, how he loves it here. This place is much better than anti-void.
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I'm not going anywhere by LadyStarOrJustAstra for Photosynthesis
Fandoms: Undertale (Video Game)
12 May 2025
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Error is abducted by Nightmare and Ink saves him. Things become a tad bit ballistic. Error saves Ink from breaking every bone in his body just to get to Nightmare, thank the stars.
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[formerly aoam: extras
but i only ever posted this oneshot and have since realized a "non-canon extras collection fic" is not a very good way to organize this. so from now on, other oneshots will be posted as oneshots. the content of this fic has not changed.][characterization is from my other fic, awakening of a multiverse. not canon, mostly just because it doesnt fit into the story anywhere.]
Error finds Ink, trapped in the Anti-Void, and rescues them.
Series
- Part 3 of awakening of a multiverse
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Prompts to practice writing/Random Undertale Multiverse scenes by Mev22300
Fandoms: Undertale (Video Game)
19 Apr 2025
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Just some writing practice ill post to document my progress, pls remember there might only be one chapter dedicated to said topic including all its tags.
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Multiverse Exchange by Violetales7
Fandoms: Undertale (Video Game), Multiverse (Undertale) - Fandom
05 Apr 2025
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A series of short stories inspired by Deathly Exchange dealing with the Multiverse of Undertale.
These are the stories of the multiverse meetings, relationships, and friendships of the varying alternates in worlds of wonder, mystery, and danger, starting with a simple relationship between two. Will they be friends at first, or fall in love?Let's see shall we...
Series
- Part 3 of Origins (Undertale)
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I'm Willing To Kill Anything For My Kids by Greenspirit_Foxle
Fandoms: Undertale (Video Game)
23 Mar 2025
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Error always felt a pull to destroy, like Ink felt to create, for as long as he could remember. Error earliest memory is of destroying, not in joy or feeling forced, he did it in his madness, and uncontrolled and seemingly aimless rage. Eventually, he gain some semblance of control over himself, leading him to mark non-original aus he enjoyed so he wouldn't destroy them, and properly learn his role, his purpose. However, he didn't shy away, or regret the things he did, he reveled in it. He enjoyed destroying, and thought of his destruction as his own special 'art'. And yet, his destruction has definitely dialed down over the years, and been much more precise.
However, he never would have thought he could create something complex, or so, so positive if it involved his destructive magic, and now four living, breathing children. And he had gained friends along the way he eventually trusts them with.
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It’s been 494 years since Nightmare turned Dream into stone. Nightmare wakes up in the middle of the night to a sudden surge in positivity, realizing who it likely is, he decides to teleport straight to the source.
He finds his brother, but he hasn’t aged a day. Nightmare stares at the 6-year-old, actually seeing Dream makes him fully understand just how young both of them were at the time. He realizes neither of them was truly at fault for what happened, they were both just kids who needed someone to parent them.
This realization causes Nightmare to take Dream in, becoming the responsible adult they both needed.
Series
- Part 1 of His Only Regret stuff
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"There's only two things in this world you can be, the one that perseveres, or the one whose body is left for the beasts." The stable hand stated weakly.
Ink curled up beside him and tried to ignore the sounds outside his little sanctuary, the rattling of his shaking bones doing little to cover them. He picked at the spaces between his phalanges and stared unseeingly into the stalls across from them. Perseverance? The concept felt so foreign to his young and shaken mind.
How could he possibly persevere when it felt as if he was unraveling?
(A swap au of my dear friends' multi-chapter fic, Perseverance. Detailing a scenario where Asgore had not found Ink on that last search party, and Ink was forced to survive outside the kingdom walls. You do not have to read Perseverance to enjoy this fic.)
Series
- Part 1 of Perseverance unraveling