Undertale Fanfictions
10 stories
Endless possibilities (Underfell Sans x Gender Neutral Reader)*BEING REWRITTEN!* by glossedweed
glossedweed
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    Parts 62
Word has been released that monsters now roamed the surface, and you can't help but feel slightly skeptical. You had been told since childhood that monsters were vile and repulsive creatures who wanted nothing more but human blood pouring from the palm of their hand. You didn't know what to think of the monster race, but majority of the human race did. The tension between monsters and human kind was sickening. People had told you to stay away from monsters at all costs. But that'll be a bit difficult when two skeleton brothers move in next door to you. And why bother lying? You can't deny that one of them has stuck on your mind. (Warning. There's a lot of colourful language, so just a heads up. And also, the artwork doesn't belong to me. Credits to the rightful owner.)
The Smiling Hero (My Hero Acidamiea x Male Sans Reader) by The_Smiling_HeroSans
The_Smiling_HeroSans
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    Parts 84
Basically it's Sans from Undertale in MHA. I do not own Undertale, My Hero Acidamiea, or any of the photos and videos I use in this story. Undertale is owned by Toby Fox. My Hero Acidamiea is owned by Shueisha and Viz Media. Photos and videos are owned by their respective owners.
For now and Forever (AsrielxM!Reader) by FeistyParadox
FeistyParadox
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    Parts 8
It was meant to be nothing more than another simple, uneventful day in your simple, uneventful life. You were taking a break from the world around you, as you did so often before. Never would you have imagined to meet Asriel, much less befriend him. If you had only known what you've gotten yourself into, you would have ran... Also avaiable on archiveofourown
SAVE (Asriel X Reader) by salchli10
salchli10
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    Parts 8
Everyone knows of the story of how Frisk fell into the underground. Everyone knows how they became friends with every monster, and how he was able to SAVE them all... Except for one.... The little yellow flower that everyone knows. But, no one knows about the timeline where you fell down instead, and was able to SAVE everyone. Especially that little yellow flower.
Undertale x Child!Reader Scenarios by yiffcakes
yiffcakes
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    Parts 18
Back in business, bishes. ❤️🧡💛💚💙💜 The sight of an Undertale book that isn't romance-oriented fills you with DETERMINATION! Envision yourself raised by one or more Undertale characters in this growing collection! Because reality is overrated!
More then Friends (Asriel X Reader) by Huge-Anime-Nerd
Huge-Anime-Nerd
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    Parts 3
It started as a normal day, and you decide to climb Mt. Ebott And your tripped and fell into the underground you meet a lot of friends that day but one becomes your best friend, will you have a future together?
My little flower Asriel X Reader by NekoMania39
NekoMania39
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    Parts 15
One rainy day you were walking and met the royal prince. You couldn't stop thinking about him. Something inside you was blooming but having a boyfriend made it harder. Will that love bloom or not?
Asriel x reader by chairebooks
chairebooks
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    Parts 10
You did it, you saved everyone. But you can't help but feel like You are missing someone. Then you finally realize what to do. So you hopped in the mountain to find him.
Darling! ( Mettaton x Reader ) by mettatonneo
mettatonneo
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Warning! This story may contain spoilers for the pacifist run of Undertale, so made sure you've finished that first! There IS NSFW/Lemon in this story, but it is only for a brief chapter-and it is not required that you read it. You've been in the underground for a while. You're only a human, but you've decided to stay in the underground instead of leaving everything behind to reach the surface. You're a big fan of the star of the underground, Mettaton-you couldn't explain how you felt about him in any way other than that you were romantically attracted to him...Especially in his newer form... This is the second x Reader fanfic I've done so far and oh man I'm really excited to write this one! To be honest I've been really excited to get to this one which might explain my compulsive updating on the previous one...Oops.
Goat Lover (Asriel X Reader) by FoxClawWarrior
FoxClawWarrior
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    Parts 18
Run. That's all what is your thinking about. Your family is abusive and you decide to run up the mountain, despite the legend. After you fall, you meet a very special goat. (You are 16 in the beginning. deal with it. Asriel is 9 in the beginning of the story, just to make it cute!)