Undertale and more Undertale
35 stories
His Summoner || Demon! Nightmare Sans x Reader by StrawberryMilkSnake
StrawberryMilkSnake
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When a demon summoning goes wrong, a rich and powerful man's son gets killed and (Y/n) is forced to team up with the Demon King that did it to survive the ensuing attempts on her and her family's lives. But the King will only do it on one condition: he gets her soul. So with no choice but to die for her mistake, His Summoner promises him her soul when the job is done. | - Demon! Nightmare Sans x Female Reader - A little bit of a reverse harem with plenty of Bad Sanses x Reader moments (with a canon reason for it :D), but ultimately, (Y/n) is Nightmare's - Honestly you could read this with no prior knowledge of any of the characters and you'd be just fine - Kinda a slow burn? But don't worry, I throw in so many subtle/not-so-subtle intimate moments with all the Sanses that it makes it worth the wait :D - I'll throw in some bonus chapters with the other Sanses for extra (non-canon) fluff that doubles as a breather from the story, too - Is the relationship toxic? Maybe. I mean, this is canon Nightmare after all. But that's the beauty of a fictional story, no? - A lot of the symbolism and hidden meanings aren't obvious, so you might have to be on the lookout to see them (and keep in mind: Night doesn't openly show many emotions, so the devil is in the details) - I'm not going to spoil anything, but for all you anxious readers out there like me, I'll divulge I'm a sucker for happy endings *wink* - It's my interpretation of the characters (kept as canon as possible)
Reborn as Error by Kiwi_Seal
Kiwi_Seal
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Cover image made by me. Someone meets their end too soon and meets someone who gives them another chance to live a more fulfilling life. One that they would enjoy despite the problems that may come along. In other words, reader becomes Error.
Mr.  Erratum by SleepyPersonHere
SleepyPersonHere
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Error can take it no longer. After centuries of Pain and suffering, Error no longer cares what happens to the people who caused him pain, and now wants to leave the place he has called home for all his life. Error, after being attacked by half the multiverse's inhabitants, tries to end his misery by falling into the void, the one thing in which he knows can kill his more or less immortal soul, but, instead of falling into oblivion for all eternity, he wakes up in a hospital in the NaJ universe. While suck there, Error takes up the name Erratum, and tries to blend into society by becoming a design and technology teacher with the help of this universe's Ink and Blue. But, with his unstable mind and strange resemblance to the schools P.E teacher, it's no wonder that his students try to dig into his past, going as far as to break into his home. While the students try to find out who their strange teacher is, Erratum will slowly adapt to his new lifestyle. While learning who to trust and who he shouldn't, he and the people around him will learn dark secrets about each other's past and will try to overcome them- But when a familiar face returns to harm Erratum's new way of life, how will the skeleton protect the people he has come to care for?
The Nightmare's Glitch (ERRORMARE/NIGHTERROR) by HULLO_and_Erroe
HULLO_and_Erroe
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Error and Nightmare have crossed paths after a battle that could have ended Errors life. Nightmare brought Error into the gang, and their life will never be the same with the new threats and feelings that face them. Especially after the main antagonist - Error Gaster - Finds Errors whereabouts and plans to ruin all their lives.
A Glitch And A Nightmare ( Error x Nightmare ) !DISCONTINUED! by _bumblee_bee_
_bumblee_bee_
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Error and Nightmare have always had a platonic relationship but things start to change when Ink takes his own desire for Error a step too far. Nightmare clearly isn't happy about this and is willing to do anything to protect and stay with the destroyer of worlds. Along the way, a certain golden skeleton and a blue starry-eyed skeleton end up joining the Multiverse's most notorious gang.
Reincarnated as Horror Sans by Cosmicstars08
Cosmicstars08
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What happens if Someone from our world was reincarnated as Horror Sans? Would they be able to survive or die trying? Through his entire life? 1/7
I am the classic by KarmaAkabane425
KarmaAkabane425
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Somehow...I've become a sans...and not just any sans.. I'm classic!? What the flip is going on!? Wait why are different sans and papyrus's showing up at my home? I didn't even mess with the machine yet since I got here since I was busy working out so I didn't tire easily! (Different things happening, possible different personalities since I'm not good at that. Also comment what sans and papyrus's you want to see appear in the third or fourth chapter. Thank you I have a few in mind along with ink and error. Maybe even nightmare and dream. And maybe nightmares gang? Idk yet
Reborn as the tree of feelings by KarmaAkabane425
KarmaAkabane425
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What if someone died and became the tree of feelings from dreamtale? Well things won't stay the same, that's for sure. (Different everything etc, different personalities etc, different multiverse
Becoming dream from dreamtale  by KarmaAkabane425
KarmaAkabane425
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What if someone from our world became dream on the first day they were made and were determined to not lose their brother to corruption like the original dream did in the story/game/movie? Even if they had to hurt the villagers to keep them away from nightmare they will. They will also protect nightmare, their brother from those who want to hit him. They won't be naive and hopeful like original dream. He would even pretend to be the guardian of negativity. He would rather kill the villagers then let then hurt his brother. Yet he still kinda failed and gets turned into stone but not for the reason one may think because Unknown to him nightmare notices his brother keeps getting hurt and finds out the reason for it was that they think Dream his the guardian to negativity. This end up with dream getting a protective corrupted goop of a brother. Well not what he expected but oh well at least he still has his brother. (Things will be different etc, including personality)
reincarnated as corrupt nightmare by nelliesheerin
nelliesheerin
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you died and when you wake up your in a completely different world the one of dreamtale as a goest trying your best to help nighty survive the abuse the villagers put him through. ... sounds like fun! 'not' I just hope I can figure out a way to save nighty before the apple event happens. there's no way in hell am I going to let him die and I refuse to take his place.