- The Underground - Undertale Fanfiction Ongoing
- Reads 20
- Votes 0
- Parts 5
- Time 19m
A young child named Storm falls into the Underground and has to find out how to survive in this new hostile environment with her ghost friend Eva. - The Alien Hero of the Underground (Ben 10 X Undertale) Ongoing
- Reads 8,993
- Votes 193
- Parts 19
- Time 6h 18m
This story follows the storyline of if Ben 10 travelled the Underground with Frisk. Feel free to notify me of any errors in the story. I hope you enjoy. (I do not take credit for any artwork I use throughout the story.) (Undertale and Ben 10 both belong to their respective creators.) - Ask Undertale Yellow (Post-Pacifist) Ongoing
- Reads 27,873
- Votes 609
- Parts 50
- Time 12m
Thanks to Frisk, the Underground is liberated. And the six humans have returned. Guide Clover back to their friends. (Prequel to Ask Post-Pacifist Noelle, HEAVY Undertale Yellow spoilers!) - An Oath of Mercy || UnderFell Sans x Reader Complete
- Reads 11,296
- Votes 472
- Parts 14
- Time 2h 21m
One clumsy moment and a broken leg are all it takes to leave you at the mercy of the very edgy and very hostile monsters of the underground. Thanks to your knowledge as a doctor (and oath to do no harm), you're able to convince the Great and Terrible Papyrus to keep you alive. But how are you going to find your way back to the surface with a bum leg and a short skeleton that doesn't seem to like you? | - UnderFell Sans x Human Reader - Enemies to lovers but Fell is the only one hating - Your leg privileges are revoked, and Fell needs to wash his mouth with soap - Flowey is an equippable companion and decides to help you cuz he actually gets something out of it - My own interpretation of UnderFell (tho from what I've seen it doesn't really have a narrative anyway) - Grouptale [Undertale AU] Complete
- Reads 39,176
- Votes 659
- Parts 53
- Time 14h 25m
What if the six fallen humans who died before Frisk never died and instead joined Frisk on their journey through the Underground? It all seems good... aside from Frisk. Why are they really in this timeline? What do they want? Join the other six as they try to learn about 'the eighth human', why everything is so strange and how to escape the underground. [Cringe artwork by me] - Kimetsu No Undertale [DISCONTINUED] Complete
- Reads 12,074
- Votes 684
- Parts 12
- Time 1h 58m
[I wrote this when I was like 16/17 😭😭 Have some mercy lmao] [New Undertale story releasing on April 8th!] [KnY/Undertale Crossover] [Undertale x Reader] Being a Demon Slayer meant killing something that looked even REMOTELY threatening. However, when you arrive in a familiar underground filled with Monsters with Zenitsu and Uzui, you realized that you'll have to put down the blades for this adventure. Oh yeah, you should ALSO find a way out to return to your own world. But that's another problem for another you. SPOILERS FOR KNY AND UNDERTALE (obviously) (Also on Quotev under the same name) - Undertale : Ghost (UndertalexReader) Complete
- Reads 12,700
- Votes 359
- Parts 10
- Time 37m
What do you do when no one can see you? - As if I'd let you go? || Yandere Frisk x Sans! Complete
- Reads 3,173
- Votes 33
- Parts 7
- Time 22m
Frisk have fallen to underground as frisk leaved the ruins it seems like she have met with someone a bit too... special to her? - Unexpected Love | Sans x Reader Complete
- Reads 314,575
- Votes 9,644
- Parts 34
- Time 2h 49m
You climbed the famous Mt. Ebott to prove to a group of your friends that humans don't disappear when they go up the mountain. While walking around the peak, you trip over a root in the ground and fall forward, expecting to hit the ground. Instead, you were met with open air. As you fell down the large hole, you let out a shrill scream before hitting the ground and blacking out. When you wake up, you find yourself in the Underground where monsters had been banished to by the humans. You meet several monsters down in the Underground, some becoming friends and some becoming enemies. One particular monster though, has been making your heart flutter and your tongue get tied. Sans the skeleton. A new threat appears when a human that had been thought to be dead comes back and threatens you and the entire Underground. Will you be able to stop them or will you be used as a puppet and watch your friends die? Maybe the only thing that can defeat LOVE is love... Author's Note: this was my very first story so sorry if there's bad grammar or confusing scenes, enjoy my awful writing! ((COVER ART IS NOT MINE)) - Puns ( Sans x reader ) Complete
- Reads 492,789
- Votes 16,245
- Parts 12
- Time 45m
Warning! There is a chance that there will be spoilers for the pacifist run of undertale. I recommend finishing that before reading this. There won't be any spoilers for the no mercy run, so don't worry about that! Also, don't worry about anything NSFW/lemon if that's not what you're into-there won't be any of that here. You're a human that's fallen down into the underground. You've decided that you'll stay instead of going home after fighting Asgore and sparing him. Now, you had made some great friendships while in the underground-but one of those friends in particular was one you'd like to be a little more than friends with... Aaaa an X reader fic! I haven't done one of these before, but I hope you still like it! - The First Human [X Sans] {COMPLETE} Complete
- Reads 101,845
- Votes 3,156
- Parts 39
- Time 2h 55m
Imagine Undertale, but Chara never showed up. Chara wasn't the first human in the Underground. What if a glitch occurred, and you fell down instead? You fell into the Underground, but you cant remember your previous life. Now, you are surrounded by strange monsters, who have also never seen a human before. Will they let you live? [written 2017] - New Family (Undertale au's x OC) Complete
- Reads 4,258
- Votes 92
- Parts 17
- Time 1h 44m
*Not completed (on Haitus with this one) just trying to prevent wattpad from deleting it* A teenage hero has fell down into the underground known as undertale. She is injured and stays away from the monsters that live underground for their own protection... because she is being chased. *give credit to all artists for the cover and any art I use in this. Great work! And the au sans belong to their rightful owners* - ✔️The 9th human- Undertale x Reader Complete
- Reads 41,214
- Votes 922
- Parts 20
- Time 2h 29m
Frisk spared everyone. The barrier was broken. All the monsters are free. But you, an 12 year old girl on a hiking trip, fall down. Now that the barrier is broken, no one should be left in the Underground, right? This is my first story, so it might not be too good... still, I hope you like it! Cover made by @Fluffy-Bush - Undertale x Infant!Reader Complete
- Reads 175,275
- Votes 4,417
- Parts 33
- Time 5h 55m
Taking a journey through the Underground seems fun to experience and to Fight or Act through. But is it really fun when you're just an infant? Will you ever make it back home? Or will you be forever trapped in the Underground? And most importantly: We all know how our favorite monsters reacted to Frisk as a child, but how will they react to you being just a small baby? •--------------------------• -Warning!- This is a story-like 'x Reader' only these aren't one-shots or any of the gf or bf relationships. Its kinda like a caretaker ship. - There will be some minor choices that you can choose between in most chapters. - I will be editing chapters for spelling and grammar errors. I'm a slight perfectionist and OCD. Sorry. - { Completed!~ } - Started: Somewhere around June 24, 2017 Ended: March 21, 2018 - Whatever It Takes (A story based on the Undertale AU Storyshift) Ongoing
- Reads 277
- Votes 21
- Parts 8
- Time 1h 29m
The underground was quiet, as usual, when suddenly, in the ruins, a human falls. He is the ¿second? to fall, but it is not what we expect... his name is Sera, and he has a rather dark story. What adventures will the underground hold for him?
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