1 - 20 of 40,845 Works in Sans (Undertale)
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Summary
What if the player never existed?
What if instead of Kris, Noelle fell into that dark fountain with Susie?
What if Kris has no association with the Knight and knows nothing of the dark worlds?
What if the soul that was desperately needed to seal fountains was Kris's and Kris's alone, yet the human is blissfully unaware of how desperately they are needed? Of the leadership fated for them?
...
Kris watched as Noelle walked out of the classroom with Susie, sighing softly.
Whatever. Honestly...they knew they should care more but...Susie never bullied Noelle anyway....
However...for some reason after that, Noelle and Susie completely disappeared for the rest of the fucking day!?!?! And for some goddamn reason when they came back Noelle is randomly seeking them out and Susie is acting weird as fuck, and they're somehow a lot closer??? And for another unknown goddamn reason Susie WILLINGLY asked to do their project.
What the fuck is going on??????
Whatever. They don't need to be a part of this bullshit. At least Berdly is just as confused as to what the hell is going on with their project partners.
Series
- Part 1 of Deltarune Fanfiction
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Duality of Justice by hw_writer
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
28 Sep 2025
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Summary
Fighting against royal nepotism,
Stood 4 humans who died for monsterkind.The first was the patient of spoiledness,
Who planted the seeds for action.
Then came the revolutionary,
The brave soul who died for the cause.
Don’t forget the human who stood on their values,
Whose silent perseverance was idolized for resilience.
At last was the giver,
Their kindness to the unkind led to their demise.The fifth, the enforcer of justice.
With the revolutionary seeds in the soil,
Born with a soul so determined,
The others sat for him so he could stand.
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A world where Chara and Asriel weren’t able to go through with their plans, yet the royal family continued on a murder spree. For each human who fell, the underground saw them as leaders of revolution, only for that hope to be stripped by the monarchy. How would Clover be different from the others?Navigating through the complex relationship between the crown and the underground, Clover and Frisk set on a journey to liberate monsterkind, using everything they could to bring justice against royalty. But when one man serves as the judge, jury, and executioner, how fair can justice really be?
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He was a bad brother. He knew that. He didn’t need all of this shit to happen for him to acknowledge that.
...Whatever it is that’s happening at this point.
Or
Papyrus made a stupid mistake and now sans is gone.
Series
- Part 1 of MeryFell
- Language:
- English
- Words:
- 1,461
- Chapters:
- 2/?
- Hits:
- 5
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Summary
In 2015, Toby Fox discovered the Multiverse. By 2040, mankind reveres the AU characters, treating most like celebrities and some like gods. Naturally, unethical experiments ensue, and some humans are turned into powerful monsters for the sake of researching without disrupting timelines. They may fight to stop the cycle, but some will not come out the same as they once were.
This work was remade in protest against current censorship laws around the world after the deletion of the original copy of SDAU off of Google Docs.
NEW FEATURES:
-New content and lore
-Improved writing
-Third-person perspective for ease of POV changes
-Unabashed Dreammare subplot
-Trans plotlines for Lamia and Scarlet; otherkin plotlines for Wren and Adwin
-The villains are worse somehow
-Nearly everything has been rewritten!- Language:
- English
- Words:
- 754
- Chapters:
- 1/?
- Hits:
- 4
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Summary
Birds are singing, flowers are blooming, on days like this skeletons like me should be dead.
Or: In which Dream jumps and definitely needs a hug
- Language:
- English
- Words:
- 696
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 7
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Without History (maybe some things should stay forgotten) by Human_with_no_life
Fandoms: Undertale (Video Game)
28 Sep 2025
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Summary
After the barrier breaks and monsters and humans live together on the surface there is still mysteries about the underground to be solved. Most of them will stay forgotten or buried forever.
Until an almost promise Sans made frisk makes him tell a long and complicated story. His story, well not exactly 'his' but as many questions as it answers it raises more. One thing if for sure it will change everyone involved.
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Kidnapping the Boss and giving him the happy childhood that he deserves by catdemonakatsukigirl
Fandoms: Undertale (Video Game)
28 Sep 2025
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Summary
When Killer decided to bring some unknown science experiment into the castle, the last thing they expected was time travel. But hey now they have the most adorable baby bones ever, their boss Nightmare who doesn't know who they are and oh yeah is also 5.
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Yuri lost everything in the blink of an eye, but now she's been taken by Nightmare who intends to use her as bait for his four underlyings.
Things get so much worse before they get better.
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Papyrus hadn't been worried! ...Well. Maybe he had been, just a bit.
It'd been a while since anyone had heard from the human, so he called to check on them. But when a conversation revealed just how young they were, he realized things had to change. They were all on their own down here. And... They had nowhere to go.
Well! If there was no one else to take care of the baby bones, Papyrus would just have to do it himself!
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Sans was trying to get through life and ignore the apathy that had settled over him for Papyrus’s sake. It was just so hard to care about anything when he knew none of it mattered. But when Papyrus had him bring the anomaly home like a lost puppy, things stopped adding up.
How could such a sweet kid be responsible for the relentless time loops?
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Frisk was used to being on their own, and they were pretty good at taking care of themself. But—Well. ...Dying hurt. They just wanted to get back to the surface! With Undyne in the way, they were hopeless.
So when a phone call from Papyrus somehow ended with an offer for them to crash at his house, Frisk could only be relieved for the break.
They could afford to rest for a while, right?
Series
- Part 1 of Finding Home
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Summary
Grey Script is an Original OC based in Undertale Lore.
A skeleton awakens to a world she knows and knows nothing about. Her past is locked behind trauma and the one who can help her is locked in their own battles. Will she be able to face her trauma and live a new life with the other? Or will she succumb to its darkness and dust?
Series
- Part 1 of Into the Multiverse
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A Small Act Of Kindness(not really, it was actually quite important) by 3chovine
Fandoms: Undertale (Video Game)
27 Sep 2025
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Summary
Error breaks the Barrier.
Y'know, cause he's a good person now. And might as well use his human soul collection for something.Series
- Part 1 of DoodleVoid
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Alternate Archive by WakuEggroll
Fandoms: Blue Archive (Video Game), Undertale (Video Game), 本好きの下剋上 - 香月美夜 | Honzuki no Gekokujou | Ascendance of a Bookworm Series - Kazuki Miya, SPY x FAMILY (Manga), 小林さんちのメイドラゴン | Kobayashi-san Chi no Maid Dragon | Miss Kobayashi's Dragon Maid, 明日方舟 | Arknights (Video Game), Touhou Project, Mahou Shoujo Madoka Magika | Puella Magi Madoka Magica, 龍が如く | Ryuu ga Gotoku | Yakuza (Video Games), Gabriel DropOut (Anime), Gabriel DropOut (Manga), Team Fortress 2, モブサイコ100 | Mob Psycho 100, Assassination Classroom, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), Vocaloid, UTAU (Audio Database), 呪術廻戦 | Jujutsu Kaisen (Anime), 呪術廻戦 | Jujutsu Kaisen (Manga), New Dangan Ronpa V3: Everyone's New Semester of Killing, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), Plastic Memories (Anime), Borderlands (Video Games)
27 Sep 2025
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Summary
Every Sensei is different, so who are these other Senseis?
Well, you have a skeleton that can teleport, a suave assassin who turns invisible, a dragon (and a maid?), a rabbit that can freeze a city, a Yakuza legend, and... a horsegirl?!
A collection of contained crossover Senseis from different fandoms updated for every day of AU-gust 2025!
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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
27 Sep 2025
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Summary
It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
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Two souls in the Underground, intertwined by fate and by a prophecy that keeps them apart.
Heads up before you read:
In this fic, Chara is alive and far from a good person. They’re not a mindless killer, but a narcissistic kid. This is not a fluffy Charisk story. Chara and Frisk’s relationship is deeply toxic.Please look at the tags before you continue.
I've been experimenting with third person for a while now, and I've grown to like it a lot more than first person. For those who came from my other fic, which I promised a sequel for, I’ll try my best, but I’m not sure how that will go now that I’ve fallen in love with third person and started a new long fic. Please don’t be angry I will try to finish my other fic as well.
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Summary
You really should try living a little, but it's kind of hard when you're literally Death. The other immortals might be your best shot at happiness, even if it'll probably look really bad to outsiders that the three dark sides of the multiverse's balances are hanging out.
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silence is sometimes enough words by Nevascaisgonnagetyoass for Evans_Multiverse
Fandoms: Undertale AU's - Fandom
27 Sep 2025
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Summary
Wake up buried in snow, alone, and with no memories?
Check.
Kepp seeingg numbers, words, and text floating around every object and surface as far as the eye can see?
Also check.
Why does every person he meets say he needs help?!
His perfectly fine if you ask him."I wonder what determination taste like"
Note from the author:
This is my take on Fatal Error—a much more none canon, this isbt even OOC this is just straight up diffrent person with the same name, amnisiec version of him.
He’s also not fully canon-compliant in terms of power scaling and has and maybe different origin and personality.
It’s my reimagining of him.
Glitchy, lonely, and filled with questions, bad puns, power to blow up annoying people and some more puns. -
Soulbound by Tricky_17
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
27 Sep 2025
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Summary
After the events of the true pacifist route in Undertale Red & Yellow (with Frisk choosing to stay with Toriel):
Monsterkind has been living peacefully on the surface among humans ever since a young child, Frisk, saved them from their long captivity in the underground.
All is well for Frisk and their friends. All except Clover, a young boy who was recently brought back to life by Asriel Dreemurr as gift for his selfless sacrifice in the underground. While he appreciates his second chance at life, he has never gotten over a friend he wishes he had never had to say goodbye to. Chara Dreemurr, the first human to fall into the underground, and one of two ghosts, alongside Clover, who guided Frisk through their journey, has not forgotten about her friend either. Unlike Clover, Chara was not given a second chance at life, and continues to watch over Frisk on the surface. While she enjoys Frisk’s company, Clover has always been at the forefront of her mind. Unknowingly to Clover, there is one way for Chara to return to the living realm. However, Chara has been hesitant to act on this.
After all, such an act would require a permanent marriage of souls.
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Summary
Mettaton is ecstatic and happy for Sans and Grillby’s family and cannot wait for the wedding. But what happens when he discovers something’s off and goes to Alphys for a system checkup?
Series
- Part 3 of Undertale Life
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Summary
Title from the song: McCafferty’s “Alligator Skin Boots”
Ink has known Dream for a long while, long enough to know that drinking was a genuine pastime of his.
If never was that bad before, why was there an issue now?Or:
Dream comes home drunk and Ink starts to realise his best friend has some less than perfect coping skills.
Series
- Part 5 of Icarus writes Drink???
- Language:
- English
- Words:
- 3,471
- Chapters:
- 1/1
- Kudos:
- 7
- Hits:
- 45