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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
22 Jun 2026
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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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After being "the nice girl next door" but also riddled with crippling anxiety, an inability to stand up for herself, a very controlling mother, and a crush on the one student Hometown fears the most, Noelle gets an opportunity through her sibling December Holiday, someone she never thought could come back finally popping up in everyone's lives 9 years after an event Hometown called "The Tragedy™" but in the process, will learn a lot about herself and her own mother too, and find a new home with her older sibling and their partners, and learn about herself along the way.
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Gaster tutted. "You'd truly throw away your future - the future of all monsterkind - for him? For her? For a lost child? For a broken television? For an orphan and a machine that cannot be fixed?"
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Undertale Trash Heap AU: Spamton's chance to be a Big Shot comes from Dr. Gaster, the Royal Scientist. But Gaster is hiding something from him.
Freedom has a cost. And in this universe, it won't be Spamton who pays the price.
After all, he has a family waiting for him. Doesn't he?
Series
- Part 9 of [A Trash Heap.]
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Who would have thought that an argument between you and your sibling would lead you to meeting monsters. Let alone one of them turning into the love of your life.
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You are not a good person. You've been told this multiple times throughout your life, and your actions often prove this.
You decide to do one more bad thing, because it's better for you to dirty your already stained hands than risk others, like your ribling Frisk, being harmed.
You don't regret what you did, though the consequences that follow aren't always good.
You're not allowed to have good things but...
Maybe things can change?Archive warnings DO apply; check the tags for more info.
Let me know if there are any mistakes, English isn't my first language, and I'm trying to get better ^^- Language:
- English
- Words:
- 1,032
- Chapters:
- 1/?
- Kudos:
- 3
- Hits:
- 30
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Summary
Kris broke their promise. They knew the hell they would unleash by refusing to open a dark fountain in Flower King, and still, they couldn’t bring themself to do it. They crawled through an open window into the school, and tossed themself into the abyss at the bottom of the supply closet.
What they didn’t count on was for Susie to follow them.
From the southernmost point in Castle Town, she saw it all—the Knight’s arrival, the fountains bursting from the dark. Even the cell phone Kris left behind, still whirling and shrieking its incoherent tones. Then, suddenly, it turned on, and a single contact appeared: Noelle.
In the crumbling remains of Castle Town, it’s up to Ralsei and Susie to save the prophecy, the darkners, and in fact, the world as they know it. Armed with a fading connection to the chaos unfolding in the dark, Noelle faces the daunting task of recruiting the refugees of Castle Town for one final battle.
From the Card Kingdom to TV World, from the shelter to the school, the world is growing dark, darker, and darker still.
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the resurrection miracle, or just a large piece of trash? by turntechCatnip
Fandoms: Deltarune (Video Game)
21 Jun 2026
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By the time a missing person has been missing for four years, their being missing becomes a sort of status quo. The absence is undesired, but something their loved ones grow accustomed to. It follows, then, that after the world is saved and a prophecy is averted, the missing person’s reappearance would be an upheaval of norms; doubly so when she returns exactly as she had been when she vanished and quickly rekindles her relationship with the kid she’d been fucking, now a more appropriate age.
(In which December Holiday makes a series of questionable decisions and experiences a number of alarming and painful personal revelations.)
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Caro ne voulait pas devenir “ça”
Elle voulait juste continuer à vivre.Mais vivre devient compliqué quand son corps lui rappelle constamment ce qu’elle a perdu, quand les gens hésitent entre la pitié et la curiosité, et quand les cauchemars refusent de mourir.Puis Papyrus entre dans sa vie avec toute la délicatesse d’un feu d’artifice : sincère, bruyant, profondément gentil.
Et contre toute attente, il ne cherche jamais à la sauver Seulement à rester avec elle.Une fanfiction Undertale sur la reconstruction, l’intimité émotionnelle, les monstres, les mauvaises blagues, les prothèses pleines de sable, et un squelette beaucoup trop amoureux.
- Language:
- Français
- Words:
- 21,537
- Chapters:
- 6/6
- Hits:
- 34
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Between the Monsters and Me: They Call Me Caro by Feeley
Fandoms: Undertale (Video Game)
21 Jun 2026
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Summary
(This is a translation.)
Caro didn't want to become "it."
She just wanted to keep living.But living becomes complicated when her body constantly reminds her of what she's lost, when people waver between pity and curiosity, and when nightmares refuse to die.
Then Papyrus enters her life with all the delicacy of a firework: sincere, loud, profoundly kind And against all odds, he never tries to save her.Only to stay with her , An Undertale fanfiction about rebuilding, emotional intimacy, monsters, bad jokes, prosthetics full of sand, and a skeleton who's way too in love.
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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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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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The Autumnal Equinox by TheHourglassForest (HourglassForest)
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
21 Jun 2026
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For Kanako and Clover, Dune Hill was the place to be. And after both going through many scary encounters during their short time on the surface, it was nice to have a place to call home. Free from whatever was happening in the rest of the region.
However, not all is well. And soon, they're going to find themselves in the middle of something worse than anything they've been through. Something that will test the strength of their friendship, and will have them both be asking themselves so many questions.
Because when your opponent has nothing to lose, everything can change on a dime.The second fic in The Forest Beyond, continues right after the end of Frayed Strings & Broken Promises.
Series
- Part 2 of The Forest Beyond
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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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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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"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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Dust has never had an easy life. But when Papyrus, the one thing that was good in his life, died things only ever seemed to get worse. After his mother decided to move away from the house that only brought bad memories, Dust has to get used to a new school. He quickly finds himself drowning under the pressure of bullies and his home life but maybe…amidst this suffocating sea, he can find friends to help him through this.
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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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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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He just...couldn't resist being interested in you.
Toriel was going to kill him.