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Disaster Coded || Error x Reader by Strawberry_Milk_Snake
Fandoms: Undertale (Video Game)
21 Jun 2026
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Summary
There's only one rule for those capable of AU hopping: never bring a real person into the Undertale multiverse. But, like all rules, it was destined to be broken.
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A Future Without Them by Baddrummer
Fandoms: Deltarune (Video Game), Undertale (Video Game)
21 Jun 2026
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Summary
Years pass. People grow. The world moves on without you. The Angel grew content with that for a while. It still hurt whenever they thought of the world that had long banished them, but something new pulled them out of the depths. Now, the Angel walks amongst friends who swear that they will not be banished. Kris, Susie, and Ralsei mean everything to them. Maybe this time, their banishment doesn't have to be as set in stone as they thought.
The Roaring comes. The light falters. Everyone falls.
A desperate connection is established in an attempt to save what remains of the Angel. If they fall, all hope will be lost. The world that banished the Angel long ago has forgotten them, but they have not forgotten it. This connection will have to be enough. Even if the rules have changed irrevocably, the Angel's one goal remains the same: Find them.
Series
- Part 3 of Clawing Toward What Hope Remains
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Summary
Sequel to "Star Catcher" (though not strictly necessary to read), Swapfell Sans copes with past events and a new pregnancy.
Featuring babies, adoptive babies, bad skeletons, good skeletons, bad monsters, good monsters, bad humans, violence, fluff, smut, Royal politics, weird tree stuff, boots and amazing tits.
Story handles sensitive themes, taken to extremes.
PART ONE - Cataclysm [1-38]
PART TWO - Consequences [39-66]
PART THREE - Climax [67-85]
PART FOUR - Conclusion [86-End]Series
- Part 2 of Star Catcher
- Part 3 of Swapfell Sans OC stories
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You have a really abhorrent and drunk friend who loves travel, being the stupid pleaser you are, you go along with her plan to drive to California. After nearly crashing several times, and complaining about her backseat driving, you arrived at Santa Monica, the salty air hitting your face with a tinge of sweet funnel cake mixed into the scent profile. You nearly drowned, but someone saved you, and it was not Melissa. You expect a horrible vacation, but now you're involved in some summer romance.
or
undertale fic.
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Summary
The barrier is broken and, for most, clearer days draw near.
Alphys, however, has a sneaking feeling that something is wrong.
Series
- Part 2 of Wingdings Paradox
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The Path Less Travelled by TGClmao
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
20 Jun 2026
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Summary
"Two roads diverged in a wood, and I - I took the one less travelled by, and that has made all the difference." ~Robert Frost
Someone familiar falls into a world that is not their own, as the story always goes. Another's path of vengeance left it bitter and broken in ways unknowable, leaving the next to pick up the pieces.
Will they manage with the cards stacked against them, in a world with no real escape?
Only time will tell.
(Though, maybe not. They're pretty tired, and the ghost in their head isn't exactly helping.)
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Olive fracturetale: olive green means mercy by IlarySan13
Fandoms: Undertale (Video Game)
20 Jun 2026
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Summary
Two days after Frisk's fall, another human crosses the barrier and arrives in the Underground.
Their name is Alay, and their soul isn't red like Determination... but olive green, a strange color that represents mercy.
Toriel greets them tenderly, Frisk observes them silently, and Flowey smiles maliciously.
Everything seems to be following the same path as always, but something changes: the Underground no longer has just one human... now there are two.In a world where every decision carries weight, how far can mercy take you?... After all, mercy has two interpretations.
And Frisk knows they messed up.
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Olive Fracturetale: Verde Olivo Significa Misericordia by IlarySan13
Fandoms: Undertale (Video Game)
20 Jun 2026
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Summary
Dos días después de la caída de Frisk, otro humano atraviesa la barrera y llega al subsuelo.
Su nombre es Alay, y su alma no es roja como la Determinación... sino verde olivo, un color extraño que representa la misericordia.Toriel lo recibe con ternura, Frisk lo observa en silencio, y Flowey sonríe con malicia.
Todo parece seguir el mismo destino de siempre, pero algo cambia: el subsuelo ya no tiene un solo humano... ahora son dos.En un mundo donde cada decisión pesa, ¿hasta dónde puede llevar la misericordia?... Después de todo la misericordia tiene dos formas de interpretarse.
Y Frisk sabe que metió la pata.
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IM NOT YOURS! by Missh3h3
Fandoms: Undertale (Video Game), Fellswap - alternate universe, Underfell - Alternate Universe, Underswap - Alternate Universe
20 Jun 2026
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Summary
Y/N is a gamer girl who is doing a walkthrough of a game for her viewers.
And one day, a game booms and goes viral. So her loyal and lovely viewers beg her to play them and to make her lovely viewers happy. She bought the game.It costs a lot for a dating sim, if she may say.
but unbet she knows. That's game are going to drag her to hell.
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The Mc is trapped on this dating game, and she needs help to survive!
Would you be willing to make a decision for her?
dear reader? -
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Summary
This is the sequel of my work "How you SAVED me", so there're spoilers ahead for that work!
"Our final travel through the Underground was the best thing I've ever experienced. You were so relieved, so euphoric and excited. And there were so many funny, heartwarming and instructive moments that it's definitely enough for an entire new story."
Having received forgiveness for their previous genocide, Frisk has just reset the timeline once more (see the end of part 1!) Now, Frisk and Chara are on a mission to save no less than every monster, flower and other living being in the Underground. And they have collected all the necessary knowledge for that during the previous timelines. However, that still does not mean that things are always going to be easy.
Series
- Part 2 of How you SAVED everyone
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When the human mages first sealed the monsters underground, they accidentally created an all-seeing entity that watches over monster-kind. When the CORE explodes, this entity is given a conscience; and when Frisk falls down, the entity watches their journey to learn morality from them.
When the Barrier breaks, everyone is freed, including the entity— or as many monsters start calling her, “the Angel”— of the old prophecy, having mistaken Frisk for being that messiah. That entity is, in fact, you— the Reader.
And Sans has always been a skeptic when it came to the religious hopes of his people.
TL;DR - Reader is the collective force of all monsterkind’s wishes to/for an Angel from prophecy, made flesh. Sans, being a scientist, doesn’t know what to make of this.
This is my first fic posting on A03, but not the first fic I’ve ever written. Please keep that in mind, and thanks for checking my story out!
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Just an ordinary trip to the underground.
Oh yeah! And Frisk has the ghosts of all of the past humans in their head! What could possibly go wrong!
Frisk and the humans adventure around the underground, and help to tie loose ends and help each other with their problems.
Series
- Part 1 of Undertale: Sevenfold
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Our protagonist is once again whisked into a new world against his will, while still mentally recovering from the torment of the Evil Doctor of the last world he was in. He is now stuck in a city where Giant Amalgamates and snarky Giant Flowers attack every week and Magical Mew Mew Cutie Girls make a mess of everything. Will WingDings be able to learn to trust again to find the missing pieces of his soul or will he suffer alone trapped with his fears and doubts?
Series
- Part 17 of Shattered Soul Series
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The RougeRiddler's been named! Also there's a weird hole in the sky again! Finally several new enemies have reared their heads!
Warning: This Fanfic is not accurate to Undertale canon as the authors didn’t play Undertale when this was written and were 12. This is Book 8 of 9! This is the last complete book in the series! The next book consists of one complete chapter and one uncomplete.
Series
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He just...couldn't resist being interested in you.
Toriel was going to kill him.
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Undertale Purple - Perseverance by AnonymousWriter08
Fandoms: OMORI (Video Game), Undertale (Video Game)
20 Jun 2026
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Summary
A long time ago... humans and monsters lived in harmony. Until war broke between the two races.
The humans were victorious and sealed monsterkind deep underground with a powerful spell, that could only be broken with the power of seven human souls.
This was the tale of Mt. Ebott, and the tale trascended into legend. Those who climbed the mountain, weren't seen again.
And so, begins the tale of the fifth human soul to fall into the land of legend, to fall... into the Underground.
This is the tale of the Purple Soul... Sunny Suzuki.
NOTE:
Currently being rewritten
Suggestions are welcome :)Rewritten chapters: 8 of 21
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Help! My soul gained a body of its own by Akirathecat
Fandoms: Deltarune (Video Game), Undertale (Video Game)
20 Jun 2026
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Summary
Kris woke up the next day to see the cage empty. But that was strange, they don't remember putting the soul back in their body. They grabbed their chest to feel it, only to feel a strange coldness instead.
Meanwhile, after something hit the wagon. The soul flew off to find Kris to stop whatever they were doing. But after not finding them, the soul heads to castle town, where somebody had already had opened the door.
Edit: For everyone who keeps asking me about commissioning them, my answer is no. Please stop leaving comments like that.
Series
- Part 4 of My soul gained a body of its own au
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"We are strangers, you and I,
What makes us different from who we once were and will never be?
We are no longer the same, it is a fact,
So why does the pain remain the same?"★ ★ ★
Error has spent his life trying to forget Ink, the one he once believed was his everything.
Now, nearing his 30s, he is ready to fulfill a promise that will finally allow him to leave the past behind. But fate has other plans, and an unexpected reunion could either rekindle the flame or destroy it all.
Nothing is as it seems, and a secret kept for years could rewrite their entire history.
Will the love that once bound them be enough to heal old wounds?
Or will they continue to pretend they are strangers?
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Summary
"Somos desconocidos tú y yo,
¿qué nos hace diferentes de lo que alguna vez fuimos y nunca seremos?,
ya no somos los mismos, es un hecho,
¿entonces por qué el dolor sigue siendo el mismo?"★ ★ ★
Error ha pasado su vida tratando de olvidar a Ink, con quién alguna vez creyó tenerlo todo.
Ahora, casi a sus 30 años, está listo para cumplir una promesa con la que finalmente dejará atrás el pasado. Pero, el destino tiene otros planes y un reencuentro inesperado podría avivarlo o destruirlo todo.
No todo es lo que parece y un secreto guardado durante años podría reescribir su historia.
¿Podrá el amor que una vez los unió sanar las viejas heridas?
¿O seguirán pretendiendo ser desconocidos?
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TYlNG SO CORRIGIBLY!! by dream_sky
Fandoms: Deltarune (Video Game), Undertale (Video Game)
20 Jun 2026
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Summary
“...How much cash do you have on you?” Asriel asks out of nowhere. Chara swivels around to rifle through their wallet.
“Fifteen dollars.” They say, plucking the notes out of the inner pocket.
“Great!” Suddenly, paws on their back, and they almost topple out of their seat; Asriel is pushing them towards the counter. “Now go get us something!!”
He gives them one last shove despite their protests, and they unfortunately stumble right before the barista with the inklike, glazed eyes and that naive, curious look.
or: a deltacharisk take with absolutely nothing nefarious going on! absolutely none! totally!! and i'm definetly not lying!!