1 - 20 of 231 Works in SOUL Mechanics (Undertale)
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Life On the Surface by RetroWrites
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Oct 2025
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Summary
Frisk has freed the monsters.
Now all they need to do is to live on the surface.
Campy story with plot and sad stuff on top of regular Undertale shenanigans.
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Nightmare, trapped in stone for a millennium, awakens to find the world completely changed. And his lovers to be in a less-than-stellar condition.
It is possible to hate flowers, of all things, with all your being?
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The soul of Determination. MLP by therandomreader1009
Fandoms: My Little Pony Generation 4: Friendship Is Magic (Cartoon 2010)
16 Oct 2025
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Summary
y/n is the soul of determination. They've traveled a lot to get here, going through all sorts of universes and such, but now they've found a very peaceful world and plan to stay here for the rest of their "life". However, they are foreign to this world's magics and way of nature. How will this world react? Can they find a place to fit in? And most importantly, how will they get a body of their own? All this and more is coming now.
A slight warning, the plans I have for y/n makes it so we can't have this world be the normal MLP Friendship is Magic world. So we're gonna need to make the characters of this world anthro, if that's the right word.
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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Deltarune (Video Game), Doctor Who
15 Oct 2025
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He thought that the radiation would kill him. He thought that his time as the Doctor would come to a sad and brutal end. He was wrong. And that was so much worse.
In his efforts to find himself, and without his companions, he accidentally stumbles onto a monstrous civilization miles below the Earth. With his newfound DETERMINATION and some new allies, he'll come to realize what it truly means to be a friend, and learn how to live his last lives with his head held high.
And make sure that, just this once, everybody lives.
OR
Undertale but the Tenth Doctor replaces Frisk. Fluff, angst, AUs, and timeline shenanigans ensue.
*No knowledge of Undertale or Doctor Who is required, though it is helpful if you've experienced at least one of them.
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The Need to Persevere and The Need to SAVE by DuckyDuckyQuackQuack
Fandoms: Undertale (Video Game), Horrortale (undertale au)
13 Oct 2025
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Summary
Sans has a mission, and Aliza is a part of it.
She will persevere through anything he puts her through.
She has to get out of this hell hole. She has to help Sans with his mission. It's a good thing these things align, but it sucks that they align in such a way-- Aliza doesn't want to hurt anybody.My work for AI-Less Whumptober! It's all one continuous storyline, this is NOT a one shot book (I'm bad at those lol)
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it's ya boy, bringing you skeletons \o/
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A FINE LINE BETWEEN ORANGE AND YELLOW by Fantasy_Artist
Fandoms: Undertale (Video Game), Original Work
09 Oct 2025
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Summary
While Aneira didn't necessarily believe monsters existed, she did find the fact that everyone and their dog still did might mean something. Her childhood town of Beddgelert believed in monsters trapped under the mountains near their home that would need a seventh soul now to break out and destroy lands.
Aneira also knew that she needed to figure out what happened to the kid she was friends with who went missing. Which was how she found herself having fallen (probably) hundreds of meters below a mountain inside a cave system. Was she stupid for leaving without telling people where she was going, definitely, but, to be fair, she didn't expect to fall; she couldn't even see the hole.
Injured and wanting to go home, Aneira braves through the underground cave systems, finding MONSTERS both friendly and foes, learning about what happened to all the previous (children) HUMANS that fell.
tldr: Aneira falls instead of Frisk, is injured and is too stubborn not to use this chance to find out what happened to a friend (definitely dead by now, but she still wants to confirm), the Undertale cast feels like something is different, but not what. They also live in Wales here because why not?
Series
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Deltarune: Red & Yellow by youraveragefanficreader1710
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
05 Oct 2025
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Summary
I don't have any vague summary.
But essentially, it's Deltarune with Undertale Red and Yellow sprinkled in.
Kris' SOUL is comprised of three souls, Frisk as the Red SOUL, Chara as the Black SOUL, and finally Clover as the Yellow SOUL.
This AU will also feature UT Yellow characters, integrated into Deltarune. Will they have significance? We'll just have to wait and see...
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Summary
It's been three moons since Night killed everyone in his village. Its been three agonizing, heartbreaking moons since he had killed his brother.
There's not much to do in a soulless world. This changes, ever so slightly when he hears a desperate call from someone in the abyss.
Night doesn’t know what to make of his new situation, and he can't bring himself to move on just yet from the horrors he's committed. But life demands his interaction and input, so he forces himself up anyways.
Dream would do the same, if they were here. But they're not, so Night might as well pick up the slack.
Series
- Part 1 of One Hand Offered
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Summary
That golden sunset is always temporary.
Frisk doesn’t know why, but every time they get their “happy ever after,” the timeline...
It just… stops.
No light.
No sound.
No sensation.
Just oblivion.It all turns
D A R K
D A R K E R
Y E T D A R K E R
And they reset.
Over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and
What's even the point?
They tried everything.
It's hopeless.
They should just give up.
*But it refused.
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A world of a single child's imagination...
- Language:
- English
- Words:
- 161
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 4
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Deltarune: The Lighter side of the Dark by Gabe_reviews0408
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow (Master Sword Video Game)
16 Sep 2025
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Summary
Asriel is forced to be transferred to a new college where he meets a plethora of new friends and discovers a new world hidden in the dark where he begins to dig up old trauma and face the truth of what really happened back in hometown. and his friends also dig up their own trauma because they were bound to be dragged into this.
or
Gaster decides that to add an Asriel subplot to the story of his Deltarune which may or may not end up changing the events of his story however it doesn't matter as the results will still be Very, VERY INTERESTING
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GLITCHTALE.exe by PseudoAuthor (ElGato17_1)
Fandoms: Undertale (Video Game), Glitchtale - Fandom
15 Sep 2025
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Tudo começa e termina em uma rota onde piedade já não é uma opção viável. De novo, e de novo, e de novo, você já está fazendo este caminho por rotina, parece que outra vez você vai acabar seu jogo sem descobrir uma novidade sequer, mas um novo caminho de eventos aparece de repente, abrindo novas rotas enquanto desfia a linha do tempo.
Series
- Part 1 of GLITCHTALE (1)
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After 4 years of Frisk being on the surface with their new monster family, trouble brews when outside forces try to tear them apart. People Frisk'd rather forget about, trying their best to drag them away from their true family.
Meanwhile, Frisk tries their best to save Flowey from his fate. Maybe, with enough determination, they can SAVE Asriel.
And sometimes, the bloodlust clouds their rational thinking.
Or: Frisk's abusive family tries to take them away, and Frisk's feeling homocidal.
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Sweet as Sugar by Beewritesstuff (Mimispace)
Fandoms: Undertale (Video Game), Deltarune (Video Game)
10 Sep 2025
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Summary
The Barrier was broken, Monsters are free...
...and Papyrus couldn't look away from the pretty girl that always comes into the shop at five o'clock.
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Gamers and Catgirls go together like PB&J by silverstormsxx
Fandoms: Undertale (Video Game)
07 Sep 2025
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The origin of the switch SOUL human!!
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Just is the same by m3t4lm4dn33s
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
07 Sep 2025
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Summary
after fighting Flowey, clover gets sent back again,
but this time?
something changed. -
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Summary
Being stuck in an alternate universe sucks. Especially when Dust and Horror have no way to contact Nightmare and go home. Dust's magic has been acting odd ever since they got here but he's keeping it a secret. And Horror is just trying to protect the other from every monster in the underground desperate to eat. It's only a matter of time before something gives.
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System Error: Accidental Acquisition of Children by Frikisbits231
Fandoms: Undertale (Video Game)
05 Sep 2025
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Summary
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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1000 Years I Love You by Pan (ASexualPan)
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
05 Sep 2025
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Summary
It's been 1000 years since the events of Undertale Yellow.
Clover wakes up in a hospital bed. He doesn't know how much time has passed. Kanako doesn't have fruitful answers, but Axis might.This is a projected semi-long fic with themes of isolation, acceptance of loss, and the leaning of Artificial Intelligence in order to cope. Many of the characters in this fic are not real!
Join Clover and Kanako as they explore an abandoned, state-of-the-art facility that is allegedly built Just For Them! Axis and his AI friend have a plan in motion, but it all needs to be revealed in due time.Do holograms dream of hugging clover?